Time Calculator
Add and subtract time, sum durations, and convert between time units.
How It Works
- Choose a tab. Pick Add/Subtract for two-value operations, Time Sum for adding many durations, or Unit Converter to switch between time units.
- Enter your time values. Type hours, minutes, and seconds for each entry. For the converter, enter a number and pick the source unit.
- Get the result. The result updates instantly as you type. Carry-over is handled automatically.
- Add more rows if needed. In the Time Sum tab, click "Add Row" to include more durations. The running total keeps updating in real time.
Frequently Asked Questions
How do I add two times together?
Use the Add/Subtract tab to add or subtract two time values. Enter hours, minutes, and seconds for each, then select the operation. The result handles carry-over automatically (e.g., 70 minutes becomes 1 hour 10 minutes).
Can I sum more than two time durations?
Yes. The Time Sum tab lets you add as many time durations as you need. Click "Add Row" for more entries, and the total updates instantly as you type.
How does the unit converter work?
Enter a value and select the unit (hours, minutes, seconds, or milliseconds). The converter instantly shows the equivalent in all other units, which is useful for payroll, billing, or project tracking.
Can I subtract one time from another?
Yes. On the Add/Subtract tab, select Subtract and enter the two time values. Negative results are shown with a minus sign so you can see the shortfall.
Does it handle carry-over correctly?
Yes. When minutes or seconds exceed 59, they are carried into the next larger unit automatically. The same applies in reverse for subtraction, borrowing from hours when needed.
Is the time calculator free to use?
Yes, completely free with no sign-up. All calculations run in your browser, so your time entries never leave your device.