Free Online Calculators

Finance, math, health, construction, and everyday tools in one searchable catalog.

39 calculators

Time Calculator — Hours, Duration & Timesheet

Add or subtract time, find hours between clocks, total timesheet shifts and pay, or convert duration units with clear visual results.

Calculate restaurant tips before or after tax, split the bill equally or by custom shares, round the total, and see exactly what each person pays.

Estimate a practical daily drinking range from weight, exercise and heat, with glasses, hourly pace and transparent adjustments.