Add, subtract, multiply or divide durations in hours, minutes and seconds, with decimal hours and totals. Enter your values; the result updates as you type, with the method shown below.
Formula
Durations are converted to seconds, combined, then shown as h:mm:ss
Worked example
2:45:30 + 1:30:45 = 4:16:15.
Frequently asked questions
How do I enter a duration?
As h:mm:ss or h:mm.
Can the result be negative?
Yes, when subtracting a longer duration.
Can I multiply a duration?
Yes, for example a lap time × 10.
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Results are estimates for information only. Check important figures with a professional.