JotTools .

Time Unit Converter

Free time unit converter: seconds, minutes, hours, days, weeks, months and years. Instant, private, runs in your browser, no sign-up.

1 h =
60 min

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

  1. Enter the number in the Value box.
  2. Choose the unit you have under From (for example h).
  3. Choose the unit you want under To (for example min).
  4. 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