Time Calculator
Add, subtract & calculate time
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Full guide
How to Add, Subtract, and Calculate Work Hours
Learn time arithmetic for hours and minutes, timecard totals, overnight shifts, overtime, and 12h vs 24h formats — free online.
About Time Calculator
A versatile time calculator with three modes: Time Arithmetic for adding and subtracting hours, minutes, and seconds; Timecard Calculator for computing total work hours from clock-in/out times across multiple days; and Time Between for calculating the exact duration between two times or dates. Supports 12-hour and 24-hour formats, handles overnight shifts, calculates overtime, and converts between time units. 100% client-side — all calculations happen in your browser.
Time Calculator Features
- Add & subtract time
- Timecard mode
- Time between dates
- 12h & 24h formats
- Overtime calculation
- Multiple entries
- Unit converter
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