Time Unit Converter
Convert milliseconds, seconds, minutes, hours, days, weeks, months and years.
About the Time Unit Converter
Seconds, minutes, hours, days and weeks have fixed sizes. Months and years don't, so this converter uses Gregorian-calendar averages: a year of 365.2425 days and a month of 30.436875 days.
For exact durations between two dates, use the date difference calculator instead.
The formula
Result = Value × (size of the “from” unit ÷ size of the “to” unit)
- 1 ms
- 0.001 ms
- 1 s
- 1 ms
- 1 min
- 60 ms
- 1 h
- 3,600 ms
- 1 d
- 86,400 ms
- 1 wk
- 604,800 ms
Every time unit is converted through millisecond using its exact definition.
Common conversions
| From | To |
|---|---|
| 1 h | 60 min |
| 1 d | 24 h |
| 1 wk | 7 d |
| 1 yr | 365.2425 d |
| 1 mo | 30.436875 d |
| 1 d | 86,400 s |
| 1 yr | 8,765.82 h |
How to read your result
- Month and year results are averages.
Worked example
Example: 3 hour = 180 min
- Inputs: Value: 3; From: Hour (h); To: Minute (min).
- Formula: Result = Value × (size of the “from” unit ÷ size of the “to” unit)
- Multiply by the number of min in one h 3 × 60 = 180 min
- Result: 3 hour = 180 min
- 1 h = 60 min
- 1 min = 0.01666666667 h
Questions people ask
How many seconds are in a day?
86,400 seconds (24 × 60 × 60).
Why is a year 365.2425 days?
That's the Gregorian calendar average: a leap day every 4 years, except century years not divisible by 400.