Hours Calculator

How to use

1. Enter the first duration in Hours 1 and Minutes 1. The sample values are 2 hours and 30 minutes.
2. Set Op to + to add or to − to subtract. Then enter the second duration in Hours 2 and Minutes 2. The sample second duration is 1 hour and 45 minutes.
3. Press Calculate. Adding the sample values shows 4h 15m. Subtracting them shows 0h 45m. The layout is always a number of hours, the letter h, leftover minutes, and the letter m.
4. If the second duration is longer and Op is −, a minus sign is placed in front, such as -1h 30m when 1 hour is minus 2 hours 30 minutes. Minutes in the answer are always under 60, so 90 minutes of total time becomes 1h 30m.

When it helps

Add two shifts, a class block and a lab, or a pair of travel legs when all you have is lengths of time. Payroll notes that stay in hours and minutes can be totaled without converting everything to decimal hours first.

This form does not start from a clock. If you know you began at 9:00 and worked a duration, use the time calculator, which rolls past midnight and reports how many days moved. If the question is how many calendar days sit between two dates, use the date calculator instead of stuffing days into Hours 1.

Limits

There is no seconds field, no hourly wage, and no overtime rule. The page will not multiply the total by a pay rate or split time before and after a cutoff. It also will not turn the result into days for you: 30 hours stays 30h 0m rather than 1 day and 6 hours.

Hours 1, Minutes 1, Hours 2, and Minutes 2 are read as whole numbers. A decimal typed into minutes is truncated, not rounded. Op only offers + and −, so you cannot multiply a duration by a count of shifts. Blank fields count as zero.