Add or Subtract Time Calculator

Add hours and minutes to a time, or subtract them, to find out what time it will be (or was).

How to add time to a clock time

  1. Add the minutes first. If the total is 60 or more, subtract 60 and carry 1 hour.
  2. Add the hours.
  3. If the hour goes past 12, switch between AM and PM. If it goes past midnight, it is the next day.

Example: 7:30 AM plus 8 hours 30 minutes. 30 + 30 = 60 minutes, which is 1 hour, so the minutes become 00. 7 + 8 + 1 = 16, which is 4:00 PM.

Common questions this answers

  • What time will my 8-hour shift end?
  • What time was it 3 hours ago?
  • If I need 7 hours of sleep and wake up at 6 AM, when should I go to bed?

Frequently asked questions

What time is 8 hours from 7 AM?

8 hours after 7:00 AM is 3:00 PM.

What time was it 5 hours ago from 2 PM?

5 hours before 2:00 PM is 9:00 AM.

What time is 12 hours from 9 PM?

12 hours after 9:00 PM is 9:00 AM the next day.

How do I add hours and minutes to a time?

Add the minutes first and carry any extra 60 minutes as an hour, then add the hours. Switch AM and PM each time you pass 12.

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