Time Calculator
Add or subtract days, hours, minutes, and seconds easily. Free online time duration calculator.
Base Time
Add (+)
Time to Add / Subtract
Result
0d 0h 0m 0s
How to add or subtract time?
Adding or subtracting time can be tricky because time is not based on a decimal system (base-10). Instead, there are 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a day. This calculator handles the base conversions automatically, allowing you to seamlessly add or subtract days, hours, minutes, and seconds.
Example
Adding 2 hours 45 minutes to 1 hour 30 minutes correctly rolls over to 4 hours 15 minutes, rather than the incorrect decimal sum of 4.75.
Common Use Cases
- Adding up total hours worked across multiple time entries.
- Calculating elapsed time between two events with mixed units.
FAQs
Can I subtract time and get a negative result?
Yes — subtracting a larger duration from a smaller one returns a negative result, useful for checking if a deadline has been missed.