Free Time Calculator
Add and subtract times and durations.
13:30:00
Result time
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How to use the Time Calculator
- 1Enter a start time.
- 2Add or subtract a duration.
- 3Read the result.
Features
- h/m/s inputs
- Crosses midnight
- Duration mode
Frequently Asked Questions
Can I add two durations?
Yes — duration mode adds two lengths without clock wrapping.
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About the Time Calculator
Add or subtract durations (h:m:s) and compute clock arithmetic across midnight. The Time Calculator runs entirely in your browser — your data is processed locally and never uploaded to a server. Explore more Calculators tools or browse all free online tools.