Time Unit Converter
Convert time units instantly: milliseconds, seconds, minutes, hours, days, weeks, average months and years, with a live hh:mm:ss readout.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
How many hours is 90 minutes? How many seconds in a week? How many hours are 30 days? This time unit converter answers as you type, covering milliseconds, seconds, minutes, hours, days, weeks, months and years in one place, with a swap button and a common-values table under the result.
The everyday factors are exact: 1 second = 1000 ms, 1 minute = 60 s, 1 hour = 3600 s, 1 day = 86400 s and 1 week = 604800 s. Months and years have no single exact length, so the converter is honest about it: the month is the Gregorian calendar average of 30.44 days (2629746 s) and the year is the matching Gregorian average of 365.2425 days (31556952 s — exactly 12 average months). Both are labeled as averages in the unit list, so you always know you are looking at a calendar mean rather than a specific month or year.
A composite hh:mm:ss line under the result shows the entered duration as a clock-style reading — type 5400 seconds and see 01:30:00 next to the converted value. Both fields are live and two-way: enter a value in either one and the other updates instantly, rounded only for display so you never see floating-point noise.
Everything runs locally in your browser — no server call, no account, nothing to install, and the page keeps working offline once loaded. It is a practical companion for timesheets and billing, media and video timing, workout and interval planning, server timeouts and any spec sheet that mixes seconds, minutes, hours and days.
Example. 90 minutes converts to 5400 seconds, 1.5 hours, and an hh:mm:ss reading of 01:30:00.
Limit. A month is the Gregorian average of 2629746 seconds and a year is 31556952 seconds, not a specific calendar month.