Tous les calculateurs

267 outils

Date Duration Calculator

Calculate the exact time difference between two dates, in years, months, days, weeks, hours, minutes, and seconds.

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Age Calculator

Calculate your age in years, months, and days based on your birth date.

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Dog Age Calculator

Convert your dog's age to human years, and calculate their age in dog years.

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Time Calculator

Add or subtract time durations in days, hours, minutes, and seconds.

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Time Duration Calculator

Calculate the duration between two specific times, including hours, minutes, and seconds.

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Time to Decimal Calculator

Convert days, hours, minutes, and seconds into a single decimal value for easy calculations.

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Work Hours Calculator

Calculate total work hours, including breaks and overtime, for your timesheet.

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3-Digits Stopwatch

A precise stopwatch with millisecond accuracy, perfect for timing events in games, sports, and daily tasks.

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Leap Year Calculator

Determine if a year is a leap year quickly and accurately.

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Lunar Calendar Converter

Convert dates between Gregorian and Lunar calendars.

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Hijri Date to Gregorian Converter

Convert dates from the Islamic Hijri calendar to the Gregorian calendar.

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Hijri Date Converter

Convert dates from Gregorian to Hijri and vice versa, supporting various Islamic calendar standards.

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Days Between Two Dates Calculator

Calculate the number of days between two specified dates quickly and accurately.

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Date Add Subtract Calculator

Add or subtract days, months, or years from a given date to find a future or past date.

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Date Calculator

Perform various calculations involving dates, such as adding or subtracting days, and finding the day of the week.

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Reading Time Calculator

Estimate how long a book or article takes from word count or pages, your reading speed (WPM), and optional daily minutes to see days to finish.

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Sleep Cycle Calculator

Rough wake-time targets from bedtime, or bed-time ideas from your alarm, using adjustable cycle length (often 90 minutes). Not medical advice.

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Duration Sum Calculator

Add many clip lengths in one go (MM:SS, H:MM:SS, or seconds per line). Great for podcasts, edits, and playlists.

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Vertical Safe Zone Calculator

Turn top/bottom/side margin percentages into pixel insets for 9:16 vertical video (Shorts, Reels, etc.). Planning helper—not official platform specs.

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Cat Age Calculator

Rough cat years ↔ human years using a common simplified chart. Decimal ages supported—not veterinary advice.

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Rule of 72 Calculator

Estimate doubling time from a growth rate, or implied rate to double in N years. Educational mental math only.

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ISO Week Number Calculator

Get ISO week number and ISO year for any calendar date (ISO 8601, week starts Monday).

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Business Days Calculator

Count Monday–Friday days between two dates (weekends only; no public holidays).

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Narration Time Calculator

Words plus words-per-minute to estimate voice-over or audiobook duration.

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Knitting Gauge Calculator

Convert stitches and rows per 10 cm ↔ per inch for pattern scaling.

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Crochet Hook Size Calculator

Match hook diameter in mm to common US letter / number labels (approximate chart).

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DPI Print Width Calculator

Pixels and DPI to print width in inches; handy for photo prints.

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Aspect Ratio Calculator

Given width and ratio W:H, compute height (or scale both sides by a factor).

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Video File Size Calculator

Bitrate and duration to estimated file size (Mbps, minutes).

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Bandwidth Download Time Calculator

File size and download speed to approximate transfer time.

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World Clock (Two Time Zones)

Show current date and time in two IANA time zones side by side.

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Multi-Timezone Meeting Overlap

2–5 IANA zones, one calendar day, shared local office hours—see which UTC hour starts put everyone in-window (optional Mon–Fri).

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Semester Week Calculator

Week number since a semester start date (weeks aligned to Mondays).

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Final Exam Grade Calculator

Weighted grades: what you need on the final to reach a target course grade.

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Simple GPA Calculator

Enter grade points and credits per line; computes weighted GPA on a 4.0-style scale.

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Hourly to Annual Salary Calculator

Hourly rate × hours per week × 52 (simple, no tax).

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Freelance Hourly Rate Calculator

Target annual income, billable weeks/hours, and buffer % to a suggested hourly rate.

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Coffee Brew Ratio Calculator

Coffee grounds (g) and ratio 1:N to total brew water in ml.

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Baker's Percentage Calculator

Flour weight and ingredient % of flour to ingredient grams.

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Daily Water Intake Estimate

Body weight (kg) × 0.033 L rough estimate—not medical advice.

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Running Pace Calculator

Minutes and seconds per km to km/h and approximate mile pace.

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Race Pace Split Calculator

Race distance and goal time → average pace per km and per-5 km cumulative splits.

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Paint Coverage Calculator

Wall area, coverage per gallon, and coats → gallons needed (rounded up).

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Concrete Slab Volume Calculator

Length × width (ft) × depth (inches) to cubic yards for a rectangular slab.

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Tile Quantity Calculator

Room floor area, square tile size, and waste % → approximate tile count.

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Lawn Fertilizer Bags Calculator

Lawn area and coverage per bag → number of bags (rounded up).

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YouTube Chapter Timestamps

Paste segment durations per line; get cumulative chapter markers for descriptions.

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Tip Calculator

Bill amount, tip percent, and party size—tip, total with tip, and per person.

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BMI Calculator

Body mass index from weight (kg) and height (cm)—adult screening categories only.

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Discount Calculator

Original price and percent off—sale price and savings.

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Trip Fuel Cost Calculator

Miles, MPG, and price per gallon—gallons used and trip fuel cost (US units).

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Mortgage Payment Calculator

Loan amount, annual rate, and years—estimated monthly principal & interest (excludes tax/insurance).

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Compound Interest Calculator

Principal, annual rate, years, and compounding periods per year—future value.

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Percentage Change Calculator

Old value vs new value—absolute change and relative percent change.

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Markup & Margin Calculator

Cost plus markup % on cost—selling price and margin % of selling price.

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Sales Tax Calculator

Pre-tax subtotal and tax rate—tax amount and total with tax.

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Square Footage Calculator

Rectangle in feet—length × width to square feet (and approximate square meters).

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Simple Interest Calculator

Principal, annual rate %, and years—interest and total repayment.

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Break-Even Calculator

Fixed costs, variable cost per unit, and price—units needed to break even.

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Rent Affordability Calculator

Monthly income and max rent % of income—rule-of-thumb rent cap.

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Decimal Odds to Implied Probability

Enter decimal odds (e.g. 2.50)—naïve implied win % (no vig removed).

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Credit Card Payoff Estimator

Balance, APR, and fixed monthly payment—months to payoff and total interest (simplified).

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CAGR Calculator

Starting value, ending value, and years—compound annual growth rate %.

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Retirement Savings Calculator

Monthly contribution, nominal annual return %, and years—future value and total contributed.

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Inflation Calculator

Present value, annual inflation %, and years—future nominal value and multiplier.

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Car Loan Calculator

Principal, APR %, and term in months—monthly payment and total interest (amortizing).

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Max Loan from Payment

Affordable monthly payment, APR %, and years—estimate maximum loan principal.

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Electricity Cost Calculator

kWh used and price per kWh—total electricity cost.

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Proportion Calculator

Solve a:b = c:x for x (cross-multiply: x = b×c÷a).

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Time Unit Converter

Decimal hours or total minutes to hours-and-minutes text.

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Random Number Generator

Integer range, how many numbers, optional unique draws (≤ range size).

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Fuel Efficiency Converter

US MPG ↔ liters per 100 km using a fixed conversion constant.

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Unit Price Calculator

Total price and quantity—cost per unit; optional second product comparison.

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Profit Margin Calculator

Revenue and cost—gross profit dollars and profit margin % on revenue.

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Commission Calculator

Sale amount and commission rate—fee and net to seller.

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List vs Sale Discount

List price and sale price—discount percent and dollars saved.

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Height Converter

Centimeters ↔ feet and inches for body height planning.

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Roman Numeral Calculator

Convert Arabic numbers to Roman numerals and parse common Roman strings back.

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Age Difference Calculator

Years, months, and days between two birth dates (calendar-based).

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Overtime Pay Calculator

Base hourly rate plus regular and overtime hours—overtime paid at 1.5× for a rough gross total.

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Savings Goal (Months)

Target balance, monthly deposit, and nominal annual rate—months to reach goal (simplified).

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Payback Period Calculator

Upfront cost and constant yearly benefit—simple payback time in years.

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Wind Chill Calculator

Air temperature and wind speed—approximate wind-chill index (educational).

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Celsius Fahrenheit Converter

Convert a temperature between °C and °F.

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Kilometers Miles Converter

Kilometers ↔ statute miles using the standard conversion constant.

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Pounds Kilograms Converter

Convert mass between pounds and kilograms.

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Liters US Gallons Converter

Liters ↔ US liquid gallons (not UK imperial).

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Split Bill Calculator

Total bill, headcount, and optional tip percent—per person share.

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Reverse Percentage Calculator

If a value grew by P% to reach V, find the original base before the increase.

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Weighted Average Calculator

Two value–weight pairs—weighted mean (e.g. grades and credits).

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Circle Area Calculator

Radius → area πr² and circumference 2πr in consistent units.

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Right Triangle Calculator

Two legs of a right triangle—hypotenuse and area.

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Hourly to Monthly Pay

Hourly rate × hours per week × (52÷12)—rough gross monthly (before tax).

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Percent of a Number

What is P% of N? Quick multiply N×P÷100.

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Price Before Tax

Tax-included total and rate—net price and tax portion.

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Stacked Discounts

Two successive percent-off steps—final price and equivalent single discount.

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Square Root

Principal square root for non-negative real x.

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Dew Point (Magnus)

Air temperature °C and RH%—approximate dew point for planning.

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Inches ↔ Centimeters

Length conversion using 1 in = 2.54 cm.

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Meters ↔ Feet

Meters and feet using a fixed conversion constant.

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Acres ↔ Square Feet

1 acre = 43,560 sq ft—common US land unit helper.

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Decimal Degrees to DMS

Convert decimal degrees to degrees, minutes, seconds.

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Seconds to H:M:S

Split a whole second count into hours, minutes, seconds.

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Password Entropy

Character pool size and length—approximate bits of entropy.

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GCD and LCM

Greatest common divisor and least common multiple of two integers.

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Interest-Only Loan Payment

Principal and APR—monthly interest-only payment (no amortization).

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Overtime 1.5× and 2× Pay

Regular, time-and-a-half, and double-time hours in one gross estimate.

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CM to Pixels

Physical length in cm and DPI—pixel count along that edge.

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Factorial (n ≤ 20)

Small factorials for combinatorics homework checks.

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Combinations n choose r

Binomial coefficient C(n,r) with a stable multiplicative formula.

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Golden Ratio Layout

Given long or short side, find the other for φ ≈ 1.618 proportions.

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Rectangular Prism Volume

Length × width × height in consistent units.

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Cylinder Volume

π r² h for a right circular cylinder.

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Sphere Volume

(4/3) π r³ from radius.

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Half-Life Remaining

Idealized (1/2)^(t / t½) fraction remaining for teaching sketches.

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BMR Calculator

Mifflin–St Jeor resting metabolic rate from weight, height, age, and sex.

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Loan-to-Value (LTV)

Loan amount and property value—LTV % for quick mortgage context.

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Debt-to-Income Ratio

Monthly debt payments and gross monthly income—DTI %.

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Batting Average

Hits and at-bats—batting average to three decimals.

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Slugging Percentage

Total bases and at-bats—SLG = TB / AB.

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Slope from Two Points

Two (x,y) pairs—slope m (vertical line excluded).

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Midpoint of Two Points

Average of coordinates—center between two points.

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US Quarts ↔ Liters

US liquid quarts and liters (not imperial UK quarts).

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Ounces ↔ Grams

Avoirdupois ounces and grams (mass, not fl oz).

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Kelvin ↔ Celsius

Scientific temperature offset: K and °C.

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Part vs Whole Percent

What percent is A of B? (A / B) × 100.

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m/s ↔ km/h

Meters per second and kilometers per hour (× 3.6).

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Grams to Moles

Mass and molar mass—amount in moles (n = m / M).

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Molarity (mol/L)

Moles of solute and volume in liters—molarity M.

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Dilution M₁V₁ = M₂V₂

Stock molarity, stock volume, target molarity—final volume V₂.

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Annual → Monthly Salary

Gross annual pay ÷ 12 (plus rough weekly from ÷ 52).

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Binary to Decimal

Binary string of 0s and 1s to a decimal integer.

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Decimal to Binary

Non-negative integers up to about 2²⁰ to binary text.

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Hours to Days + Hours

Total decimal hours split into 24-hour days and remainder.

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Fence Posts

Run length and spacing—post count with a post at each end.

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Rectangular Pool (US gal)

Length, width, depth in feet—rough US gallons of water.

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Stair Riser Count

Total rise and target riser height—step count and equalized riser.

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Hex to Decimal

Hex string (optional 0x) to a decimal integer.

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Decimal to Hex

Non-negative integers up to 2³²−1 to uppercase hex.

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Octal to Decimal

Base-8 digit string to a decimal integer.

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Decimal to Octal

Non-negative integers up to 2³¹−1 to octal text.

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Yards ↔ Meters

International yard (0.9144 m) conversion both ways.

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Acres ↔ Hectares

Land area: international acre and hectare.

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Mulch Bags

Bed area, depth in inches, bag size in ft³—bags to buy.

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Sand / Fill (yd³)

Length, width, depth in feet—cubic yards of fill.

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Heat Index (°F)

Temperature and humidity—feels-like heat index estimate.

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Wallpaper Rolls

Wall run, height, roll width and length—rolls needed.

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Pizza Area Comparison

Two diameters in inches—each area and size ratio.

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Sod Pieces

Lawn area and ft² per roll—how many sod pieces to order.

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m² ↔ ft²

Floor or land area between square meters and square feet.

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Nautical Miles ↔ km

International nautical mile (1.852 km) both ways.

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Degrees ↔ Radians

Angle conversion using π (exact factor).

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log₁₀(x)

Common logarithm for positive x.

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Powers of Ten (10^x)

Exponent x—ten to the x power (limited range).

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ft/s ↔ mph

Feet per second and miles per hour—speed conversion.

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Drywall Sheets

Area, sheet size (e.g. 32 ft²), waste %—sheets to buy.

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DMS → Decimal Degrees

Signed degrees plus minutes and seconds to decimal °.

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Frequency ↔ Period

Hz and seconds—f = 1/T for periodic signals.

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Wavelength (vacuum)

Frequency in Hz—λ = c / f in meters and nm.

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Voltage Divider

Vin, R1, R2—no-load output at the divider tap.

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Parallel Resistance

Two resistors in parallel—equivalent Ω.

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Ohm's Law

Solve for V, I, or R from the other two values.

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LED Series Resistor

Vs, Vf, target mA—ballast R and resistor power.

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Bytes → KiB / MiB / GiB

Byte count using binary 1024 prefixes.

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TV Viewing Distance

Diagonal inches (16∶9)—rough min–max distance in feet.

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Battery Runtime

mAh capacity and average mA load—ideal hours.

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RPM Surface Speed

RPM and diameter in inches—rim speed ft/min and m/s.

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Bar ↔ PSI

Pressure between bar and pounds per square inch.

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kPa ↔ PSI

Kilopascals and psi—pressure conversion.

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Stones + lb → kg

UK stones and extra pounds to kilograms.

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kcal ↔ kJ

Food energy kilocalories and kilojoules (×4.184).

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Stock Split Shares

Shares held and split factor—count after split.

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Pool Fill Time

US gallons and GPM—hours to fill at steady flow.

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Concrete Bags

ft³ needed and ft³ per bag—bags to buy (rounded up).

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Add R-Values

Up to three insulation layers—approximate total R.

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CPM Ad Cost

Impressions and CPM—simple media cost estimate.

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Rent per ft²

Monthly rent and leased square feet—$/ft²/month.

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Tsubo ↔ m²

Japanese tsubo and square meters for property area.

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Luggage Linear cm

Sum of three bag dimensions vs airline linear limit.

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BPM → Quarter ms

Tempo to quarter-note length for delay/MIDI math.

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Architectural Scale

mm on plan at 1:N scale to real meters.

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Meeting Cost

People, hourly rate, minutes—rough meeting cost.

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Curtain Fabric m²

Width, drop, fullness, panels—simple fabric area.

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Aquarium Water Change

Tank liters and change percent—liters to replace.

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Trip Fuel (L/100 km)

EU-style consumption, km, price per liter—trip cost.

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Vacation Payout

Daily pay × payout days—simple gross estimate.

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1RM (Epley)

Weight and reps—estimated one-rep max.

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Garden Plant Grid

Bed size and spacing—plant count on a grid.

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Duplex Print Sheets

Page count double-sided—physical sheets needed.

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Video Frame Count

FPS and duration in seconds—total frames.

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Rent per m²

Monthly rent and square meters—€/m² style density.

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Pomodoro Cycles

Available time, work and break blocks—cycle count.

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RGB → Grayscale

0–255 channels—quick luma value.

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Video Letterbox Fit

Display px and video aspect—inner size and bars.

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Words → Pages

Word count and words per page—pages to print.

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Knit Stitches Width

Gauge per 10 cm and width—stitches to cast on.

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VAT Gross from Net

Net amount and VAT %—gross and tax portion.

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Metric Ton ↔ kg

Tonnes and kilograms—SI mass conversion.

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Battery Charge Time

mAh, average charge mA, and path efficiency—rough hours (educational).

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IPv4 Subnet

Address and CIDR—mask, network, broadcast, host range, counts.

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Unix Timestamp

Epoch seconds or ms ↔ local and UTC time strings.

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Screen PPI

Diagonal inches and pixel width/height—pixels per inch.

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WCAG Contrast

Two hex colors—contrast ratio and quick AA hint.

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Permutation P(n,r)

Ordered arrangements—n choose r with ordering.

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URL Encode / Decode

Percent-encode or decode text for query strings.

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HTML Escape

Escape < > & quotes for safe HTML snippets.

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PCM Audio Size

Sample rate, bit depth, channels, seconds—uncompressed bytes.

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Trip MPG

Miles since last fill and gallons pumped—MPG estimate.

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Fraction Addition

Add two fractions and reduce to lowest terms.

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Text → Base64

UTF-8 to Base64 and character counts—runs locally.

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Z-Score

Value, mean, and standard deviation—standardize a score.

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Margin of Error

Sample size and confidence—proportion poll MOE (p=0.5).

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Credit Utilization

Balance and credit limit—utilization percent (rough guidance).

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Random String

Length and charset—tokens and test IDs (not crypto secrets).

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Decimal → Percent

Convert a decimal like 0.25 to a percent string.

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Percent → Decimal

Strip % and divide by 100—quick conversion.

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Cylinder Surface

Radius and height—lateral and total surface area.

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Water Heating Q

Mass, specific heat, ΔT—approximate energy in kJ.

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Download Time

File size (MB) and link speed (Mbps)—ideal seconds.

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Great Circle km

Two lat/lon pairs—haversine distance on a sphere.

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Decimal Hours → H:M

Non-negative hours to hours + minutes.

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Days vs Date

Calendar days from today to a date.

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Lease Miles

Allowed vs driven mileage (rough).

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fl oz → mL

US fluid ounces to milliliters.

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String Length

UTF-16 units vs Unicode code points.

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Word Count

Whitespace word count.

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Heron Area

Three sides → triangle area.

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Inverse Square

Intensity ratio vs distance change.

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dBm → mW

RF power conversion.

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Salary → Hourly

Annual ÷ (hours × 52 weeks).

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GB Download Time

Decimal GB and Mbps—ideal seconds.

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TZ Offset Δ

Numeric UTC offset hours A and B.

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Grade %

Earned ÷ possible points.

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Tip + Tax

Subtotal, tax %, tip % breakdown.

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Hex → RGB

Parse #RGB / #RRGGBB.

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Hypotenuse

√(a²+b²) for a right triangle.

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Ellipse Area

π times semi-major times semi-minor.

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Cylinder Volume

πr²h for a right circular cylinder.

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Sphere Surface

4πr² from radius.

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Arc Length

Fraction of circumference from central angle.

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Sector Area

Pie-slice area from r and θ°.

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Third Angle

180° minus two known angles.

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Coterminal Angle

Same terminal side in [0,360).

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Polar Distance

Euclidean distance in the plane.

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Work (J)

Force times distance in SI units.

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Power from E,t

Average watts over an interval.

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log₂(x)

Binary log for positive x.

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ln(x)

Natural log for positive x.

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Harmonic Mean

Two-number harmonic average.

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Polygon Interior

Each interior angle for regular n-gon.

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TDEE Calculator

Mifflin–St Jeor BMR × activity multiplier.

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Deficit Timeline

Rough days to lose weight at a set deficit.

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Macros → Grams

Calories and P/C/F % to daily grams.

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Protein by kg

Simple g/kg/day protein target.

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Net Pay (Flat %)

Illustrative take-home after flat %.

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Biweekly ÷26

Gross per paycheck from annual.

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Semimonthly ÷24

Twice-a-month gross from annual.

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HR Zones

Training bands from max heart rate.

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BSA Mosteller

Body surface area in m².

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Waist-to-Height

Simple WHtR screen.

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BAI

Hip-based adiposity index.

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Devine IBW

Classic height-based reference weight.

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Weekly Gross

Hourly × hours per week.

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Monthly Gross

Hourly to rough monthly gross.

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Lean Mass

Weight minus estimated fat mass.

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Corrected Calcium

Albumin-adjusted serum calcium (mg/dL or mmol/L)—multilingual medical-style tool.

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Dreisatzrechner

Rule of three: direct, inverse, and percent proportions — multilingual (German default, English and more).

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