Popular time conversions
- Seconds to minutes1 s = 0.0166667 min
- Seconds to hours1 s = 0.000277778 h
- Seconds to days1 s = 0.0000115741 d
- Seconds to weeks1 s = 0.00000165344 wk
- Seconds to months1 s = 3.80265×10⁻⁷ mo
- Seconds to years1 s = 3.16887×10⁻⁸ yr
- Minutes to seconds1 min = 60 s
- Minutes to hours1 min = 0.0166667 h
- Minutes to days1 min = 0.000694444 d
- Minutes to weeks1 min = 0.0000992063 wk
- Minutes to months1 min = 0.0000228159 mo
- Minutes to years1 min = 0.00000190132 yr
- Hours to seconds1 h = 3,600 s
- Hours to minutes1 h = 60 min
- Hours to days1 h = 0.0416667 d
- Hours to weeks1 h = 0.00595238 wk
- Hours to months1 h = 0.00136895 mo
- Hours to years1 h = 0.000114079 yr
- Days to seconds1 d = 86,400 s
- Days to minutes1 d = 1,440 min
- Days to hours1 d = 24 h
- Days to weeks1 d = 0.142857 wk
- Days to months1 d = 0.0328549 mo
- Days to years1 d = 0.00273791 yr
- Weeks to seconds1 wk = 604,800 s
- Weeks to minutes1 wk = 10,080 min
- Weeks to hours1 wk = 168 h
- Weeks to days1 wk = 7 d
- Weeks to months1 wk = 0.229984 mo
- Weeks to years1 wk = 0.0191653 yr
- Months to seconds1 mo = 2,629,750 s
- Months to minutes1 mo = 43,829.1 min
- Months to hours1 mo = 730.485 h
- Months to days1 mo = 30.4369 d
- Months to weeks1 mo = 4.34812 wk
- Months to years1 mo = 0.0833333 yr
- Years to seconds1 yr = 31,557,000 s
- Years to minutes1 yr = 525,949 min
- Years to hours1 yr = 8,765.82 h
- Years to days1 yr = 365.243 d
- Years to weeks1 yr = 52.1775 wk
- Years to months1 yr = 12 mo
- Milliseconds to seconds1 ms = 0.001 s
- Seconds to milliseconds1 s = 1,000 ms
About time units
The second is defined by the caesium-133 hyperfine transition frequency of 9,192,631,770 Hz. Minutes, hours, days and weeks are exact multiples of it (ignoring leap seconds). Months and years vary in length, so this converter uses the mean Gregorian year of 365.2425 days and a mean month of one twelfth of that (30.436875 days).
Time unit reference
| Unit | Symbol | Value in s | System |
|---|---|---|---|
| Nanosecond | ns | 1×10⁻⁹ s | SI |
| Microsecond | µs | 0.000001 s | SI |
| Millisecond | ms | 0.001 s | SI |
| Second | s | 1 s | SI |
| Minute | min | 60 s | Other |
| Hour | h | 3,600 s | Other |
| Day | d | 86,400 s | Other |
| Week | wk | 604,800 s | Other |
| Fortnight | fn | 1,209,600 s | Other |
| Month (average) | mo | 2,629,746 s | Other |
| Year (Gregorian) | yr | 31,556,952 s | Other |
| Julian year | a | 31,557,600 s | Other |
| Decade | dec | 315,569,520 s | Other |
| Century | c | 3,155,695,200 s | Other |
| Millennium | ka | 31,556,952,000 s | Other |
Frequently asked questions
What is the SI unit of time?
This converter uses the second (s) as its reference unit; every other unit is defined relative to it.
How many time units can I convert?
15 units are supported here, across SI, Other systems. Every pair can be converted in both directions.
Does this time converter work offline?
Yes. Once the page has loaded, every calculation runs locally in your browser — nothing is sent to a server.