Our comprehensive time calculator helps you add, subtract, multiply, and divide time values. Calculate time durations, time differences, and convert between different time units.
Add, subtract, multiply, or divide time values. Enter time in days, hours, minutes, and seconds.
Calculate the duration between two times. Enter start and end times to find the difference.
Convert time between different units: days, hours, minutes, seconds, milliseconds, weeks, months, and years.
Time is a fundamental physical quantity that allows events to be ordered from the past through the present into the future. The International System of Units (SI) uses seconds as the base unit of time.
| Unit | Symbol | Equivalent in Seconds | Description |
|---|---|---|---|
| Millisecond | ms | 0.001 s | One thousandth of a second |
| Second | s | 1 s | Base unit of time |
| Minute | min | 60 s | 60 seconds |
| Hour | h | 3,600 s | 60 minutes |
| Day | d | 86,400 s | 24 hours |
| Week | wk | 604,800 s | 7 days |
| Month (average) | mo | 2,628,000 s | 30.44 days (average) |
| Year (calendar) | yr | 31,536,000 s | 365 days (non-leap) |
If you work from 9:00 AM to 5:30 PM with a 30-minute lunch break:
If you exercise for 45 minutes daily for 5 days:
If a flight takes 2 hours 15 minutes and you have a 45-minute layover:
If you have 10 hours to study for 4 subjects equally: