Calculating time worked or elapsed
Useful for timesheets, shift calculations, and cooking or workout timers, this tool computes the duration between two clock times and automatically handles spans that cross midnight.
Time Duration Calculator
Enter a start and end time to see the exact duration between them, in hours and minutes.
How it works
- 1
Enter the numeric values and units the form asks for.
- 2
Adjust modes or toggles if present.
- 3
Read the calculated result below — it updates when inputs change.
Why use this tool
- Runs entirely in your browser — nothing is uploaded to a server.
- 100% free, no sign-up, no limits.
- Works in any modern browser — no app install, no extension, no account.
How to use Time Duration Calculator
Fill the fields in Time Duration Calculator. Results recalculate from your inputs locally — treat them as estimates when the domain involves money, health, or labor rules.
Tips for better results
Double-check units (kg vs lb, months vs years). Educational tools are not professional advice.
Privacy and offline-friendly processing
Whenever possible, Time Duration Calculator processes your data locally with JavaScript in this page. That means drafts, secrets, and unfinished work stay on your device by default. Prefer this workflow when you do not want to upload sensitive text, tokens, passwords, or files to a third-party service.
Frequently asked questions
What if the end time is earlier than the start time?
The tool assumes the end time is on the following day and calculates the overnight duration correctly.
Does it support seconds?
No, the calculator works at minute-level precision, which covers the vast majority of scheduling use cases.
Is my data uploaded when I use this tool?
For most FlyUtils tools, no. Processing happens in your browser with JavaScript. If a tool ever needs a server, that will be stated clearly on the page.
Is Time Duration Calculator free to use?
Yes. Time Duration Calculator is free, with no sign-up and no artificial usage caps for normal personal and work use.
Does Time Duration Calculator work on mobile?
Yes. The page is mobile-first, so you can paste input, tweak options, and copy results from a phone or tablet.