Time Unit Converter
Convert durations between milliseconds, seconds, minutes, hours, days, weeks, months and years — for project planning, science or simply curiosity.
Runs in your browser
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How to use
- Enter a duration.
- Choose the units.
- Read the converted duration.
How it works
Seconds, minutes, hours, days and weeks convert exactly. Months and years vary in length, so the converter uses the Gregorian averages: a year of 365.2425 days and a month of 30.436875 days.
Examples
- Project
- 1,000 hours = 41.67 days = 5.95 weeks.
- Big number
- 1 billion seconds ≈ 31.69 years.
Common uses
- Planning and estimation
- Science and programming
- Converting timeouts and intervals
Privacy & security
This tool runs entirely in your browser. Your files and text are never uploaded to our servers — processing happens on your device and results are created locally. How each tool handles files
Frequently asked questions
Why isn't a month exactly 30 days?
Calendar months range from 28 to 31 days; the average is 30.44.
Are leap seconds included?
No, leap seconds are not included.
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