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Math Calculators

Time Duration Calculator

Add up or subtract lengths of time, such as video clips, lap times, study sessions or a list of tasks. Enter each duration as hours, minutes and seconds.

Durations
Total duration2:17:452 hours 17 minutes 45 seconds
Decimal hours
2.2958
Total minutes
137.75
Total seconds
8,265
Days
0.0957
Step-by-step working
  1. Convert each to seconds (h × 3600 + m × 60 + s) and add or subtract
  2. Total = 8,265 s → 2:17:45

How to use the Time Duration Calculator

  1. Enter each duration in hours, minutes and seconds, choosing + or −.
  2. Add rows as needed.
  3. Press Calculate.

Formula

Total seconds = Σ ±(h × 3600 + m × 60 + s). Then h = ⌊total ÷ 3600⌋, m = ⌊remainder ÷ 60⌋, s = what is left.

Examples

  • 1:45:30 + 0:52:15 − 0:20:00 = 2:17:45.

Frequently asked questions

Can I enter more than 60 minutes?

Yes. 90 minutes is treated as 1 hour 30 minutes.

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