Time Calculator
Add or subtract hours, minutes and seconds, or add time to a clock time.
Enter your values to see the result.
Continue your work
- Hours Calculator — Find the time between two times.
- Time Zone Converter — Convert between time zones.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the Time Calculator
Add or subtract hours, minutes and seconds, or add time to a clock time.
- 1 Choose Add durations or Add to a clock time.
- 2 Enter the first duration or start time, then choose add or subtract.
- 3 Enter the second duration and read the result.
Example and practical tips
A flight leaving at 9:30 PM that lasts 7 h 45 min lands at 5:15 AM the next day (in the same time zone).
Frequently asked questions
Can the result be negative?
Yes. Subtracting a longer duration gives a negative result.
Does it handle time zones?
No. Use the time zone converter for that.
Report an issue
Something broken or not quite right? Tell us and we will look into it.