Duration Calculator
Convert between seconds, minutes, hours, and days
Duration Calculator is a free online tool from BrowserUtils that convert between seconds, minutes, hours, and days. It runs entirely in your browser — your data never leaves your device. No account required.
Enter a value in any field to convert to all other units.
How to use Duration Calculator
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About Duration Calculator
Free online duration converter. Convert time durations between seconds, minutes, hours, and days instantly. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
Duration Calculator specs
- Runtime
- 100% client-side (browser)
- Built on
- Native Date and Intl.DateTimeFormat APIs with full IANA timezone database support
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
How are durations converted?
Enter a value in any unit and the tool instantly calculates the equivalent in all other time units using standard conversion factors.
What units are supported?
Seconds, minutes, hours, days, and weeks are all supported for conversion.
How many seconds are in a day?
There are exactly 86,400 seconds in a day (60 seconds x 60 minutes x 24 hours). Enter 1 in the days field and the tool shows this conversion along with all other units.
Can I use the duration calculator for decimal values?
Yes. You can enter decimal values like 1.5 hours and the tool will correctly convert it to 90 minutes, 5,400 seconds, and so on.
Does the duration calculator work offline?
Yes. All conversions use simple arithmetic in your browser. No internet connection is required after the page loads.
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