Time Calculators

Work out how long something took, add or subtract time, and convert clock time into usable totals.

Calculators in Time

Time Duration Calculator
Calculate the hours and minutes between two times, including overnight spans, total minutes and decimal hours — plus add or subtract time from a starting time.
Hours Calculator
Add, subtract and total hours and minutes. Enter durations as hours + minutes or H:MM values, with automatic minute carrying and decimal hours.
Add Time Calculator
Add or subtract hours and minutes from any starting time and instantly find the resulting clock time, with overnight wrapping, multi-day durations and clear day-change labels.