Time and Work Hours Calculators

Six free calculators. Pick the one that matches what you need to work out.

What do you need to calculate?

Add or subtract lengths of time
Combine several durations into one total, even when the result is negative.
Find time between two clock times
Measure elapsed time, with an explicit switch for shifts that end the next day.
Total work shifts or a time card
One shift after a break, or a full week with estimated overtime and gross pay.

Add or subtract hours and minutes across several durations.

Example · 1h 20m + 45m − 30m = 1h 35m

Find the time between a start and an end clock time, including overnight shifts.

Example · 10:30 PM → 6:15 AM next day = 7h 45m

Total one shift after an unpaid break.

Example · 9h 30m − 1h break = 8h 30m

Most useful for time cards

Total a week or two weeks with unpaid breaks, estimated overtime and optional gross pay.

Example · 42h 30m · 2h 30m overtime · $1,093.75

Convert hours and minutes to decimal hours and back.

Example · 7h 30m = 7.50 hours

Convert between 12-hour and 24-hour time.

Example · 2:35 PM = 1435

Tasks and the calculator that fits each one
Task	Best tool	Common example
Add up several durations	Time Calculator	1h 20m + 45m − 30m
Elapsed time between two clock times	Time Duration Calculator	8:15 AM → 5:45 PM
One shift minus an unpaid break	Work Hours Calculator	9h 30m − 1h
A full week or two weeks with overtime	Time Card Calculator	Five 8h 30m days
Hours and minutes ⇄ decimal hours	Decimal Hours Converter	7h 30m = 7.50
12-hour ⇄ 24-hour time	Military Time Converter	2:35 PM = 1435

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