Duration Calculator
Converts a time duration between milliseconds, seconds, minutes, hours, days, weeks, months, and years — handy for TTLs, timeouts, and cron intervals.
≈ 1 hours
| Milliseconds | 3,600,000 |
| Seconds | 3,600 |
| Minutes | 60 |
| Hours | 1 |
| Days | 0.0417 |
| Weeks | 0.006 |
| Months (30d) | 0.0014 |
| Years (365d) | 0.0001 |
Duration Calculator — Free Online Tool
Converts a time duration between milliseconds, seconds, minutes, hours, days, weeks, months, and years — handy for TTLs, timeouts, and cron intervals.
How to use the Duration Calculator
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
Is the Duration Calculator free to use?
Yes. The Duration Calculator is completely free, with no signup, no ads inside the tool, and no hidden limits.
Does the Duration Calculator upload my data?
No. The Duration Calculator processes everything locally in your browser. Your input is never sent to a server, so it stays private even on shared devices.
Does the Duration Calculator work offline?
After the page loads, the Duration Calculator runs entirely in your browser, so it keeps working without a network connection.
Free & private — why use this Duration Calculator
The Duration Calculator runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.