FREE · TIME & DATE TOOLS
Time Duration Calculator.
Add or subtract durations in hours, minutes and seconds.
How to use Time Duration Calculator
Enter or choose the required input, adjust the settings, then generate and review the result. 01:30:00 + 00:45:00 = 02:15:00.
How it works
Add or subtract durations in hours, minutes and seconds. Duration arithmetic, not clock times; hours can exceed 24. Inputs stay on your device. Review the preview or output before using it; refresh the page to clear the current working session.
Example
01:30:00 + 00:45:00 = 02:15:00.
Questions about Time Duration Calculator
Is Time Duration Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Duration arithmetic, not clock times; hours can exceed 24. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.