How to use the Time Calculator
The time calculator adds or subtracts two times in hours, minutes and seconds.
What you need to enter
- Time A (hh:mm:ss)
- Operation
- Time B (hh:mm:ss)
The formula
It converts times to seconds, adds or subtracts, and converts back to hh:mm:ss.
Worked example
Using the default values in the calculator:
- Time A (hh:mm:ss): 02:30:00
- Operation: +
- Time B (hh:mm:ss): 01:45:30
| Result | 04:15:30 |
| Total seconds | 15330 |
| Total hours | 4.2583 |
| Total minutes | 255.5 |
Tips for better results
- Use it for work shifts, recipes and running splits.
- The total hours are also given in decimal.
Common mistakes to avoid
- Treating 100 minutes as 1 hour.
- Forgetting carry-over at 60.
Please note: Results are estimates for general use. For safety-critical work such as electrical or building projects, check with a qualified professional and local codes. See our Disclaimer.