Time Duration Calculator
Add or subtract two HH:MM:SS values and get the result instantly
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
This calculator adds or subtracts two times in HH:MM:SS format and shows the result as HH:MM:SS along with total seconds and total minutes at once. It's useful for anyone who frequently adds and subtracts time, such as tallying work or task hours or calculating workout and video runtimes.
How to use
- Choose 'Add' or 'Subtract' mode.
- Enter the first and second times in their hours, minutes, and seconds fields.
- The result is instantly calculated and shown as HH:MM:SS, total seconds, and total minutes.
- If a subtraction result is negative, an explanatory note is shown alongside it.
FAQ
- Can minutes and seconds exceed 60?
- Yes. Even if you enter values over 60, like 90 minutes or 120 seconds, they're automatically carried over into hours and minutes and shown as a tidy HH:MM:SS.
- How is a negative subtraction result shown?
- If the second time is larger, the result is shown as a negative time with a − sign in front, along with an explanatory note.
- Is the time I enter sent to a server?
- No. All calculations are processed entirely within your browser, and your inputs are never sent to or stored on a server.