Sub-second units
Milliseconds (ms), microseconds (µs) and nanoseconds (ns) measure intervals too brief to perceive. They're the language of computing, networking and high-speed physics.
Time conversion
Convert any duration,
instantly.
From nanoseconds to centuries — every common scale, side by side.
h
60
min1 h = 60 min
Quick to:
1 h in all units
| Nanoseconds | 3.600000e+12 | ns |
| Microseconds | 3600000000 | µs |
| Milliseconds | 3600000 | ms |
| Seconds | 3600 | s |
| Minutes | 60 | min |
| Days | 0.041666667 | d |
| Weeks | 0.005952381 | wk |
| Months (avg) | 0.0013689254 | mo |
| Years (avg) | 0.00011407712 | yr |
| Decades | 1.140771e-5 | dec |
| Centuries | 1.140771e-6 | c |
About time conversion
Time is the one unit nearly every culture agrees on. The second is the SI base unit, defined by the vibrations of a caesium-133 atom. From there, every other duration is just multiplication.
Everyday units
Seconds, minutes, hours and days form the human scale. 1 minute = 60 s, 1 hour = 60 min, 1 day = 24 h. These ratios trace back to ancient Babylonian base-60 arithmetic.
Months and years
Calendar months vary, so this converter uses the average Gregorian month of 30.4375 days and a Julian year of 365.25 days. Decades and centuries follow from there.
Why precision matters
GPS, finance and scientific instruments rely on precise time. Even a millisecond offset can shift a satellite fix by hundreds of meters, which is why atomic clocks define modern timekeeping.
Frequently asked questions
- How many seconds are in a day?
- There are 86,400 seconds in a day (24 × 60 × 60). A week has 604,800 seconds.
- How many minutes are in a year?
- An average year (365.25 days) contains 525,960 minutes, or 8,766 hours. The converter uses this average to handle leap years over time.
- Why do months and years use averages?
- Calendar months range from 28 to 31 days and years can have 365 or 366 days. We use the average month (≈30.44 days) and Julian year (365.25 days) so conversions stay consistent.
- What is a millisecond?
- A millisecond is one thousandth of a second (0.001 s). Modern computers and networks measure response time in milliseconds; humans perceive delays above ~100 ms.