What the Time Unit Converter does
This tool converts between units of time, from milliseconds up to years. It is handy for turning a duration in seconds into minutes or hours, working out how many days are in a number of weeks, or estimating how many hours a multi-day task will take. Developers, students, and planners all reach for quick time conversions.
How to use it
- Enter the number in the Value box.
- Choose the unit you have under From (for example h).
- Choose the unit you want under To (for example min).
- Press Convert to see the answer below.
About months and years
Months and years do not have a fixed length, so this converter uses standard averages: 30.44 days per month and 365.25 days per year. That gives sensible results for general use. If you need an exact span between two calendar dates instead, use a date difference calculator. As always, the math happens locally in your browser and nothing is sent away.
Frequently asked questions
- Which time units does it convert?
- Milliseconds, seconds, minutes, hours, days, weeks, months, and years. Any pair works, such as hours to minutes or days to weeks.
- How long is a month and a year here?
- To keep results consistent, a month is treated as the average 30.44 days and a year as 365.25 days. These averages are right for general conversions, though a specific calendar month or year will vary slightly.
- Does it send my data anywhere?
- No. Everything runs in your browser, so nothing is uploaded or stored. No sign-up, no limits.
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Last updated: June 17, 2026