Add or Subtract Hours, Minutes and Seconds
Combine two durations or find the difference between them without converting minutes into misleading decimal values first.
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Useful guidance
Accurate duration arithmetic
Minutes and seconds use base 60 rather than base 100. The calculator normalises both durations before adding or subtracting them, then presents a readable result and decimal hours.
Add durations2 hr 45 min + 1 hr 30 min4 hr 15 min
Subtract durations8 hr − 1 hr 20 min6 hr 40 min
Include seconds1:10:45 + 0:05:301:16:15