How do I add hours and minutes?

Add the minutes first; every 60 minutes becomes one hour. Then add the hours. The calculator does this for you, including seconds.

How do I calculate hours worked overnight?

Use “Time between”. If the end time is earlier than the start time, the duration is counted across midnight.

How do I convert minutes to decimal hours?

Divide the minutes by 60. For example, 45 minutes ÷ 60 = 0.75 hours.

Can the result be negative?

Yes, when you subtract a longer duration from a shorter one. The result is shown with a minus sign.

Time Calculator – Add Hours, Minutes & Time Between

How to use the Time Calculator

Choose a mode: Add / subtract durations, find the time between two clock times, or add hours to a clock time.
Enter hours, minutes and seconds, or pick the clock times.
The result appears instantly in hours and minutes, along with decimal hours for timesheets.

Formula

Total seconds = hours × 3600 + minutes × 60 + seconds

If the end time is earlier than the start time, the calculator assumes it is on the next day (for example a night shift).
Decimal hours = total minutes ÷ 60 (for example 7 h 30 m = 7.5 hours).

Worked example: A night shift

A shift starts at 22:30 and ends at 06:15. Because the end is earlier than the start, the calculator counts across midnight: 7 h 45 m, or 7.75 decimal hours.

Adding 2 h 45 m and 1 h 30 m gives 4 h 15 m.

Decimal hours for payroll

Many payroll and billing systems use decimal hours. 15 minutes = 0.25 h, 30 minutes = 0.5 h and 45 minutes = 0.75 h. So 8 h 20 m is 8.33 hours, not 8.20. The “Hours” box shows this conversion automatically.