Time Calculator
Add, subtract, or find the duration between times.
Result8 hours 45 minutes
8 hours 45 minutes (525 minutes total)
Press Escape while editing a field to reset.
What is the Time Calculator?
A time calculator finds the duration between two times, or adds and subtracts times. It's useful for working out hours worked, time until an event, or how long an activity lasts — and it handles durations that cross midnight.
Formula & how it works
Duration = End time − Start timeEnter times in 24-hour format. For durations that cross midnight, the calculator adds 24 hours so the result stays positive.
Example
From 9:30 AM to 6:15 PM.
Inputs
- Start time
- 09:30
- End time
- 18:15
Results
- Duration
- 8 hours 45 minutes
How to use this calculator
- 1Choose the operation: duration, add, or subtract.
- 2Enter the two times.
- 3See the result in hours and minutes.
Frequently asked questions
How do I calculate hours between two times?+
Select 'Duration between two times', enter the start and end times, and the calculator shows the hours and minutes.
What if the end time is on the next day?+
The duration mode automatically wraps past midnight, adding 24 hours so the result is correct and positive.