Convert time between milliseconds, seconds, minutes, hours, days, weeks, months, and years.
Enter a value to convert.
| Unit | Equals |
|---|---|
| 1 Second | 1,000 Milliseconds |
| 1 Minute | 60 Seconds |
| 1 Hour | 60 Minutes |
| 1 Day | 24 Hours |
| 1 Week | 7 Days |
| 1 Month (avg.) | 30.4375 Days |
| 1 Year (avg.) | 365.25 Days |
A time converter changes a duration from one unit to another while representing the same length of time — 1 hour and 60 minutes describe the same duration, just counted in different units. It's useful for moving between small units like milliseconds and seconds, and larger units like days, weeks, months, and years.
One-thousandth of a second. Used in computing, sports timing, and scientific measurement.
The SI base unit of time.
1 minute = 60 seconds.
1 hour = 60 minutes = 3,600 seconds.
1 day = 24 hours. 1 week = 7 days. These are fixed, exact conversions.
Unlike seconds, minutes, hours, days, and weeks, calendar months and years don't have a single fixed length. A month can be 28, 29, 30, or 31 days, and a year is 365 days most of the time but 366 days in a leap year. To give this converter a single, consistent factor for "a month" or "a year," it uses averages:
If you need the exact number of days in a specific calendar month or between two specific dates, use a date-based duration calculation instead of this average-based converter.
Time conversions come up in project scheduling when estimates are given in different units, converting durations for reports and dashboards, cooking and timers, scientific and engineering calculations, and rough age or duration calculations where an average month or year is good enough.
There are 86,400 seconds in a day (24 hours × 60 minutes × 60 seconds).
There are 10,080 minutes in a week (7 days × 24 hours × 60 minutes).
Months don't have a fixed length — they range from 28 to 31 days. This converter uses an average month of 30.4375 days (1/12 of a 365.25-day year) so a single conversion factor can represent 'a month' in general. For an exact calendar month, use a specific date range instead.
Using the average year of 365.25 days (which accounts for leap years), there are approximately 8,766 hours in a year.
Multiply the number of days by 24 to get hours.
A 365.25-day year accounts for leap years, which add an extra day roughly every four years to keep the calendar aligned with Earth's orbit. Averaging over four years gives 365.25 days per year.
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