Add Time Calculator

How to add time

1. Add the hours to the hours and the minutes to the minutes.
2. If the minutes reach 60 or more, subtract 60 and carry 1 hour.
3. If the hours pass 24 (or 12 on a 12-hour clock), the result is on the next day.

Worked example

9:45 AM plus 3 hours 30 minutes: 45 + 30 = 75 minutes, which is 1 hour 15 minutes. 9 + 3 + 1 = 13 hours, so the result is 1:15 PM.

Subtracting time

To subtract, borrow 60 minutes from the hours when the minutes would go below zero. For example, 2:10 PM minus 45 minutes is 1:25 PM. Going back past midnight gives a time on the previous day.

Frequently asked questions

What time will it be in 8 hours?

Enter the current time and add 8 hours. If the result passes midnight, the calculator shows +1 day.

How do I add 90 minutes to a time?

Enter 1 hour and 30 minutes, or 0 hours and 90 minutes; both give the same result.

Does it handle overnight shifts?

Yes. Results that pass midnight show the time on the following day.

What is 13:15 in 12-hour time?

1:15 PM. Subtract 12 from hours above 12 and add PM.