Where rounding matters
Calendar months and years are intentionally excluded because their duration is not constant.
Time converter: seconds, minutes, hours and days
Convert milliseconds, seconds, minutes, hours, days, and weeks instantly in your browser. Free, no sign-up, nothing to upload.
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How the time converter works
Convert time units online. Converts values across milliseconds, seconds, minutes, hours, days, and weeks in the browser.
How to check a result
Confirm both unit labels and retain enough decimal precision for the workflow.
Nothing is uploaded
The calculation runs in your browser, so there is no file, no queue, and nothing stored on the server.
Converting files rather than numbers? Start with the file converter directory or the compress and edit tools.
For lengths, print sizes and temperatures, switch to the unit converter for length and temperature.
Time Converter questions
Why are months and years not included?
A month is 28 to 31 days and a year is 365 or 366, so neither converts to a fixed number of seconds. Use days or weeks for exact arithmetic.
How precise are the results?
Conversions use exact factors between fixed-length units and are rounded only for display.