Time Calculator
Add or subtract hours, minutes and seconds — timesheet ready. Add and subtract times in hours, minutes and seconds. Sum work hours for timesheets, splits for training, or durations for video. Free time math tool.
About the Time Calculator
Adding times on paper goes wrong fast: 40 minutes plus 35 minutes is not 75 minutes. This calculator performs base-60 arithmetic for you — stack multiple HH:MM:SS durations and add them, or subtract one from another, with clean carrying between units. It totals work sessions for timesheets, running splits for training plans, and clip lengths for video editing, and shows both the total and a breakdown per entry.
How to use the Time Calculator
- Enter each duration on its own line, like 1:30:00.
- Choose Add or Subtract.
- Click Calculate to total the times.
- Read the result plus each line's contribution.
Key features
- Add any number of HH:MM:SS durations
- Subtract mode for time differences
- Accepts shorthand like 1:25 or 45 (minutes)
- Shows totals in hours, minutes and seconds
Can I enter times without hours?
How do I compute total weekly work hours?
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