Time Unit Converter
Convert between time units quickly and accurately.
Minutes (min)
90
1.5 Hours (h)
Milliseconds (ms)
5,400,000
Seconds (s)
5,400
Days (d)
0.0625
Weeks (wk)
0.00892857
Months use an average of 30.44 days; years use 365.25 days (accounting for leap years).
In-depth explanation
Convert durations between milliseconds, seconds, minutes, hours, days, weeks, and approximate months/years. Everything runs locally in your browser — your inputs are not uploaded to produce the result.
There are 86,400 seconds in a day (24 × 60 × 60). Months use an average of 30.44 days; years use 365.25 days to account for leap years. Calendar months vary.
Use the Time Difference Calculator in Time Tools instead. Tweak the inputs above to compare options, then copy or note the result you need.
Days are 86,400 seconds here. Months and years are averages (about 30.44 days and 365.25 days) because calendars are messy. Do not use this for a birthday in “exactly 3 months”.
For the difference between two clock times, Time Difference is the right tool. For two calendar dates, Days Between Dates. This page is “how many hours is 3 days?” not “when is my shift over?”.
Frequently asked questions
How many seconds in a day?
There are 86,400 seconds in a day (24 × 60 × 60).
How are months and years defined here?
Months use an average of 30.44 days; years use 365.25 days to account for leap years. Calendar months vary.
Need the difference between two clock times?
Use the Time Difference Calculator in Time Tools instead.
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