Tool
Time Calculator
Use this time calculator to add or subtract durations and shift clock times.
About
Time Calculator is an online clock calculator designed for adding or subtracting time durations and shifting clock times. It is ideal for anyone who needs to perform simple time arithmetic, such as combining durations from separate tasks or calculating remaining time, without dealing with dates or time zones.
Users can add or subtract hours, minutes, and seconds, or adjust a specific clock time. The calculator allows input in H:MM format, with options for AM or PM, and can also include seconds when needed. After entering durations in separate rows and choosing the operation (+ or -), users select 'Calculate' to get their result. The tool performs clock arithmetic, ensuring that totals can exceed 24 hours. Results can be checked against the displayed equation and copied, including decimal hours and total minutes.
The calculator is available online and requires JavaScript to function. It provides formulas and worked examples to help users understand the calculations, such as how 45 + 30 minutes makes 75 minutes, carrying one hour and keeping 15 minutes.
Features
- Add or subtract hours, minutes, and seconds
- Shift clock times
- Copy calculation results
- Perform clock arithmetic without dates or time zones
- Enter time in H:MM format with AM or PM
- Calculate total durations longer than 24 hours
- View results as decimal hours and total minutes
- Check the equation for calculations
- Pricing
- Free
- Pricing detail
- No account needed.
- Platforms
- Web
- Listed
- 31 Oct 2026
- Updated
- 31 Oct 2026
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