Time Unit Converter
Convert seconds, minutes, hours, days, weeks, months and years.
Time unit conversions
Time units are fixed up to weeks: 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day and 7 days in a week. Months and years vary, so this converter uses averages based on the Gregorian calendar: a year of 365.2425 days and a month of one-twelfth of that, about 30.44 days.
2.5 hours × 60 = 150 minutes, or 9,000 seconds. One million seconds is about 11.6 days; one billion seconds is about 31.7 years.
Handy reference
| Unit | Seconds |
|---|---|
| 1 minute | 60 |
| 1 hour | 3,600 |
| 1 day | 86,400 |
| 1 week | 604,800 |
| 1 average month | 2,629,746 |
| 1 average year | 31,556,952 |
Why years are not exactly 365 days
Earth takes about 365.2422 days to orbit the Sun. Adding a leap day every 4 years, except in century years not divisible by 400, gives an average of 365.2425 days, close enough that the calendar drifts by only one day every 3,200 years or so.
Frequently asked questions
How many seconds are in a day?
There are 86,400 seconds in a day (24 × 60 × 60).
How many hours are in a year?
A common year has 8,760 hours and a leap year 8,784. The average Gregorian year is about 8,766 hours.
How long is a month in days?
Calendar months range from 28 to 31 days. The average is about 30.44 days.
Last reviewed Oct 20, 2026. Results are estimates; check important decisions with a qualified professional.