Time Unit Converter
Convert time durations between ms, seconds, minutes, hours, days, weeks, and years — nothing is uploaded.
Convert time units instantly in your browser
Enter a duration and choose your source and target units — the result updates as you type. Seven units are supported: milliseconds (ms), seconds (s), minutes (min), hours (hour), days (day), weeks (week), and years (year). Nothing is sent to a server; every calculation runs locally in your browser.
All conversions use the second as the base unit. A year is defined as the Julian year of exactly 365.25 days (31,557,600 seconds), which is the conventional value used in astronomy and physics. The swap button lets you quickly reverse a conversion direction without retyping your value.
FAQ
How many seconds are in a day? There are exactly 86,400 seconds in one day (24 hours x 60 minutes x 60 seconds).
How many seconds are in a year? Using the Julian year (365.25 days), there are exactly 31,557,600 seconds in one year. A calendar year of 365 days contains 31,536,000 seconds.