Time Calculator
Add or subtract hours, minutes, and seconds.
Add or subtract spans of time, or find the duration between a start and end time — handy for timesheets, cooking, and scheduling. Everything calculates instantly in your browser.
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Result
0h 0m 0s
Runs entirely in your browser — nothing is uploaded.
How to use the time calculator
- 1Choose add/subtract or duration mode.
- 2Enter your times or durations.
- 3See the result instantly.
Frequently asked questions
Can it handle more than 24 hours?
Yes — totals can exceed 24 hours (e.g. a full timesheet), shown as total hours, minutes, and seconds.
Does it work across midnight?
Yes — in duration mode, an end time earlier than the start is treated as the next day.
Read the guide
How to Add and Subtract Time (Free Hours Calculator)