Time Converter
Convert between seconds, minutes, hours, days, weeks, years and smaller units such as milliseconds.
Convert time
Result
Time units
Every unit below converts to every other one in the calculator. Values are relative to the base unit, the second (s).
| Unit | Symbol | System | Value |
|---|---|---|---|
| Nanosecond | ns | SI | = 1e-9 s |
| Microsecond | µs | SI | = 0.000001 s |
| Millisecond | ms | SI | = 0.001 s |
| Second | s | SI | Base unit |
| Minute | min | SI-accepted | = 60 s |
| Hour | h | SI-accepted | = 3600 s |
| Day | d | SI-accepted | = 86400 s |
| Week | wk | other | = 604800 s |
| Year (Julian) | yr | other | = 31557600 s |
Second quick reference
| Second | Millisecond | Minute | Hour |
|---|---|---|---|
| 1 s | = 1000 ms | ≈ 0.01666666667 min | ≈ 0.0002777777778 h |
| 10 s | = 10000 ms | ≈ 0.1666666667 min | ≈ 0.002777777778 h |
| 100 s | = 100000 ms | ≈ 1.666666667 min | ≈ 0.02777777778 h |
| 1000 s | = 1000000 ms | ≈ 16.66666667 min | ≈ 0.2777777778 h |
Among the 9 time units on this page, the smallest is the nanosecond (ns) and the largest is the year (julian) (yr).
More time conversions
About time units
The second is the SI base unit of time, defined through the frequency of the cesium-133 atom. Minutes, hours and days are fixed multiples of it: a day here is exactly 86,400 seconds.
Calendar months and years vary in length, so this converter uses the Julian year of exactly 365.25 days, the year used in astronomy.
Frequently asked questions
- Why is there no month unit?
- Months range from 28 to 31 days, so a single conversion factor would be misleading. Use days or weeks for exact results.
- Does a day always have 86,400 seconds?
- In this converter, yes. In civil timekeeping a rare leap second can make a day 86,401 seconds long.
- How many milliseconds are in one second?
- One second = 1000 ms (milliseconds).
- How many minutes are in one second?
- One second ≈ 0.01666666667 min (minutes).
- How many hours are in one second?
- One second ≈ 0.0002777777778 h (hours).