Time Calculator
Enter compound durations such as 1:45:00 or 1h 45m. Clock arithmetic uses fixed 24-hour days without a time zone.
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How this calculator works
H:MM:SS allows hours larger than 23; minutes and seconds must be below 60. Explicit units also accept decimals. Negative durations are supported. Clock results state the day change. Use the dated time duration calculator for actual elapsed time across a daylight-saving change.
Calculations stay on your device. Empty or invalid inputs produce an explicit error. Interactive results require JavaScript.
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Save on this device, or copy settings into a link. Shared links contain your inputs; share only the details you intend.