Everyday
Time Calculator
Add and subtract time durations.
Result
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Total seconds
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Total minutes
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Total hours
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FAQ
- How does the addition and subtraction work?
- Each duration is converted to total seconds (H*3600 + M*60 + S). The operation is applied on those totals, then the result is converted back to HH:MM:SS. Subtraction shows a negative sign when the second duration is larger.
- What format should I enter the durations in?
- Use HH:MM:SS — for example, 1:30:00 for one hour and thirty minutes, or 0:45:20 for forty-five minutes and twenty seconds. Hours can exceed 23.
- Is my data sent anywhere?
- No. All calculations run entirely in your browser; nothing is uploaded.