Time Unit Converter
Convert duration among ms, s, min, h, day, week, and a mean 365.2425-day year.
How to use
- Enter a duration and choose two units from ms, s, min, h, day, week, and the mean-year option.
Capabilities and scope
Seconds are the common reference for fixed-duration units. The year option is a mean Gregorian-year duration, not a particular calendar year.
How it works
The factors are ms=.001 s, min=60 s, h=3600 s, day=86400 s, week=604800 s, and year=31,556,952 s.
Example
1 week is 604,800 seconds, exactly 7 days under these fixed units.
Useful for
- Compare seconds and milliseconds
- Convert hours, days, and weeks
- Express a mean-year duration in seconds
Before you use it
- A year is fixed at 365.2425 days, so it does not equal every actual calendar year of 365 or 366 days.
- This is not a calendar/DST elapsed-time calculator.
Standards and references
Frequently asked questions
Why isn't a year exactly 365 days?
The implementation uses the mean Gregorian year of 365.2425 days.