Base hourly rate, regular hours, overtime hours at 1.5×—gross pay estimate.
Gross pay = regular hours × rate + overtime hours × rate × 1.5. Rate may be zero; hours are non‑negative. No double‑time rules, spread‑of‑hours, or locale minimum wage—just that linear formula.
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.