Add Hours to a Time

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Add Hours to Clock Time: Learn

How to add hours and half-hours to a time:

  • Add the minutes together. If the result is 60 or more,
    • subtract 60 from the minutes
    • add 1 to one of the hours
  • Add the hours together. If the result is more than 12,
    • Subtract 12 from the number of hours
    • Switch AM to PM (or the reverse)
    • Repeat until the hours are 12 or less
  • If the final hours are exactly 12, switch AM to PM or PM to AM.

Example: What time is 17 hours and 30 minutes after 3:30 AM?

  • Add the minutes: 30 + 30 = 60. Since this number is 60 or more,
    • Subtract 60 from the minutes (60-60 = 0 minutes).
    • Add 1 to the hours (17+1 = 18 hours)
  • Add the hours: 18 + 3 = 21 hours. Since this number is more than 12,
    • Subtract 12 from the hours (21-12 = 9 hours)
    • Change AM (the original time) to PM.
  • Final answer: 9:00 PM

Add Hours: Practice

What is the sum of the times?

00:00

hours past :00



0:00 AMPM

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