Time Calculator
Add or subtract two durations in hours, minutes and seconds, and convert the result into total hours, minutes or seconds.
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What does the Time Calculator do?
Adding times by hand is error-prone because there are 60 minutes in an hour, not 100. Enter two durations, choose add or subtract, and get the answer in h/m/s, HH:MM:SS and as decimal hours — handy for timesheets where 7h 45m must be entered as 7.75 hours.
Values overflow correctly (90 minutes is 1h 30m) and negative results are shown with a minus sign.
How to use the Time Calculator
- Enter the first duration.
- Choose add or subtract.
- Enter the second duration.
- Read the result and the totals.
Examples
Timesheet
2h 45m + 1h 30m = 4h 15m = 4.25 hours.
Video editing
10m 05s − 2m 50s = 7m 15s.
Common use cases
- Timesheets and payroll hours
- Video and audio editing
- Sports and workout times
- Cooking and study planning
Features and benefits
- Private by design — your data is processed on your device and never uploaded.
- Free with no account, no watermark and no usage limits.
- Works on phones, tablets and desktops in any modern browser.
Limitations to know
- This adds durations, not clock times across midnight; for clock times treat 23:00 → 01:00 as a 2-hour duration.
Frequently asked questions
How do I convert minutes to decimal hours?
Divide minutes by 60. 45 minutes = 0.75 hours.
Can I enter more than 59 minutes?
Yes, values overflow automatically.
Does it handle negative results?
Yes.
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