If you know the monthly payment you are comfortable with, you can back-solve for roughly how large a fixed-rate, fully amortizing loan might be. Enter payment, APR, and term in years. Results help with budgeting conversations; actual approval depends on income, credit score, and lender policies.
It solves the present value of an ordinary annuity: months = round(years × 12), monthly rate = APR ÷ 100 ÷ 12, then principal = payment × ((1+i)^n − 1) ÷ (i × (1+i)^n) (or payment × n if i = 0). Assumes constant rate and full amortization.
This calculator uses plain decimal numbers. If a result looks wrong, check whether you used a comma instead of a dot (or vice versa) where the field expects one.