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Time Calculator
Add, subtract, and convert time durations in hours, minutes, and seconds.
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Time Arithmetic
Result
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Time Conversion
Converted Result
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How to Use
- Add or subtract time — Enter two time values in hours, minutes, seconds and click Add or Subtract.
- Convert time units — Enter a value, select the source and target units, and see the result instantly.
- View result — Results are displayed in HH:MM:SS format with total seconds breakdown.
Frequently Asked Questions
What time units are supported?
The calculator supports seconds, minutes, hours, days, and weeks for conversion, and any combination of hours, minutes, and seconds for arithmetic.
Can I get negative time results?
No. If the result would be negative, it will display as 00:00:00. Always enter the larger time first when subtracting.
Is this tool free?
Yes. All processing happens in your browser. No data is sent to any server.
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