Time converters
22 conversions between 10 time units. Every page includes a live converter, the formula and a full conversion table.
Units covered
| Unit | Symbol | In seconds |
|---|---|---|
| Second | s | 1 |
| Minute | min | 60 |
| Hour | h | 3,600 |
| Day | d | 86,400 |
| Week | wk | 604,800 |
| Month | mo | 2,629,746 |
| Year | yr | 31,556,952 |
| Millisecond | ms | 0.001 |
| Microsecond | µs | 0.000001 |
| Nanosecond | ns | 1.000000e-09 |
All time conversions
- Seconds to Minutes
- Seconds to Hours
- Seconds to Days
- Seconds to Weeks
- Minutes to Seconds
- Minutes to Hours
- Minutes to Days
- Minutes to Weeks
- Hours to Seconds
- Hours to Minutes
- Hours to Days
- Hours to Weeks
- Days to Seconds
- Days to Minutes
- Days to Hours
- Days to Weeks
- Weeks to Seconds
- Weeks to Minutes
- Weeks to Hours
- Weeks to Days
- Milliseconds to Minutes
- Nanoseconds to Years
Months and years are not fixed
Seconds through weeks are exact multiples of one another. Months and years are not: a month is anywhere from 28 to 31 days, and a year is 365 or 366. Conversions involving them have to pick an average, and this site uses the Gregorian mean — 365.2425 days per year and one twelfth of that, 30.436875 days, per month.
That is the right choice for a rate ("how many seconds in a year") and the wrong one for a date ("what is 18 months from today"), where you want calendar arithmetic that lands on a real date. The age calculator does the second kind, counting actual calendar months rather than multiplying by an average.
Leap seconds
Unix time deliberately ignores leap seconds, so a Unix day is always exactly 86,400 seconds even when the day it represents was not. This keeps the arithmetic simple at the cost of drifting slightly from astronomical time — a trade nearly every system makes.