Time Converter
Convert seconds, minutes, hours, days, weeks, months and years.
Note. Months and years are not fixed lengths. This converter uses the average Gregorian year of 365.2425 days and the average month of one twelfth of that.
Popular time conversions
minutes to hourshours to minutesseconds to minutesdays to hours
Time unit reference chart
What one of each unit is worth in seconds, the base unit used for every conversion in this category.
| Unit | Symbol | 1 unit in s |
|---|---|---|
| seconds | s | 1 s |
| minutes | min | 60 s |
| hours | h | 3,600 s |
| days | d | 86,400 s |
| weeks | wk | 604,800 s |
| months | mo | 2,629,746 s |
| years | yr | 31,556,952 s |
| milliseconds | ms | 0.001 s |
| microseconds | µs | 0.000001 s |
| nanoseconds | ns | 1e-9 s |
| fortnights | fn | 1,209,600 s |
| decades | dec | 315,569,520 s |
| centuries | c | 3,155,695,200 s |
Time units explained
Seconds (s)
The second is the SI base unit of time, defined by 9,192,631,770 periods of the radiation of the caesium-133 atom.
Minutes (min)
A minute is exactly 60 seconds. The sixty-fold division of the hour comes from Babylonian sexagesimal arithmetic.
Hours (h)
An hour is 60 minutes, or exactly 3,600 seconds — one twenty-fourth of a mean solar day.
Days (d)
A day is exactly 86,400 seconds by definition. The Earth’s actual rotation drifts slightly from this, which is what leap seconds correct.
Weeks (wk)
A week is 7 days, or exactly 604,800 seconds. Unlike the month and the year it has no astronomical basis.
Months (mo)
The average Gregorian month is 30.436875 days — one twelfth of the 365.2425-day mean year.
Years (yr)
The mean Gregorian year is 365.2425 days, which accounts for the leap-year rules.
Milliseconds (ms)
A millisecond is one thousandth of a second. Network latency, camera shutter speeds and audio buffers are all measured in milliseconds.
Frequently asked questions
What is the base unit of time?
This converter routes every time conversion through the second. Converting from one unit to another means converting to seconds first and then out again, which keeps every pair consistent with every other pair.
How accurate are these time conversions?
Results are shown to 10 significant digits using exact defined factors wherever a unit has one. Months and years are not fixed lengths. This converter uses the average Gregorian year of 365.2425 days and the average month of one twelfth of that.
All time conversions
Every time conversion page on this site, 92 in total.
- seconds to minutes
- seconds to hours
- seconds to days
- seconds to weeks
- seconds to months
- seconds to years
- seconds to milliseconds
- minutes to seconds
- minutes to hours
- minutes to days
- minutes to weeks
- minutes to months
- minutes to years
- minutes to milliseconds
- hours to seconds
- hours to minutes
- hours to days
- hours to weeks
- hours to months
- hours to years
- hours to milliseconds
- days to seconds
- days to minutes
- days to hours
- days to weeks
- days to months
- days to years
- days to milliseconds
- weeks to seconds
- weeks to minutes
- weeks to hours
- weeks to days
- weeks to months
- weeks to years
- weeks to milliseconds
- months to seconds
- months to minutes
- months to hours
- months to days
- months to weeks
- months to years
- months to milliseconds
- years to seconds
- years to minutes
- years to hours
- years to days
- years to weeks
- years to months
- years to milliseconds
- milliseconds to seconds
- milliseconds to minutes
- milliseconds to hours
- milliseconds to days
- milliseconds to weeks
- milliseconds to months
- milliseconds to years
- microseconds to milliseconds
- milliseconds to microseconds
- microseconds to seconds
- seconds to microseconds
- microseconds to minutes
- minutes to microseconds
- nanoseconds to milliseconds
- milliseconds to nanoseconds
- nanoseconds to seconds
- seconds to nanoseconds
- nanoseconds to minutes
- minutes to nanoseconds
- fortnights to weeks
- weeks to fortnights
- fortnights to months
- months to fortnights
- fortnights to days
- days to fortnights
- fortnights to seconds
- seconds to fortnights
- decades to years
- years to decades
- decades to months
- months to decades
- decades to weeks
- weeks to decades
- decades to seconds
- seconds to decades
- centuries to years
- years to centuries
- centuries to months
- months to centuries
- centuries to weeks
- weeks to centuries
- centuries to seconds
- seconds to centuries