Time Unit Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks and years instantly — free and private.
Project estimates, cooking timers and payroll hours all need time in different units, and this converter moves between them effortlessly. It uses standard definitions, with the year based on 365.25 days to account for leap years. Enter any duration and watch its equivalents appear instantly.
Year = 365.25 days (accounts for leap years).
How to use the Time Unit Converter
- Type the time value you want to convert in the value box.
- Choose the starting unit in the From list and the target unit in the To list.
- The converted duration appears instantly below — adjust any field to recalculate.
Time Unit Converter — FAQs
How many seconds are in a day?
There are exactly 86,400 seconds in a day: 24 hours times 60 minutes times 60 seconds. Programmers use this figure constantly for timeouts and scheduling, while payroll and billing calculations often need the same number when converting daily rates to hourly ones.
Why is the year set to 365.25 days?
A calendar year is usually 365 days, but leap years add an extra day every four years. Using 365.25 days gives the average Gregorian year of 31,557,600 seconds, which is the standard for astronomy, contracts and long-term planning where leap years matter.
Can I convert milliseconds for programming?
Yes. Enter milliseconds and convert to seconds, minutes or hours for timeouts, animation timings and performance measurements. One millisecond is one-thousandth of a second, and the tool keeps full precision so small timing values convert exactly.
Is my data uploaded anywhere?
Your data never leaves your device. This converter runs entirely in your browser using JavaScript, so nothing is uploaded, stored, shared or tracked. It works offline too, and you can use it as often as you like with complete confidence.