Time Converter
Converts durations between units. Months and years use their average length — 30.44 days and 365.2425 days respectively — because calendar months vary. For exact date arithmetic use a date difference calculator instead.
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The formula
result = value × (from factor ÷ to factor)
Each time unit is defined by its size relative to the second, so converting between any two is a single multiplication.
Every time unit
| Unit | Symbol | In one second |
|---|---|---|
| millisecond | ms | 1,000 |
| second | s | 1 |
| minute | min | 0.016666667 |
| hour | h | 0.00027777778 |
| day | d | 0.000011574074 |
| week | wk | 0.0000016534392 |
| month | mo | 0.00000038026486 |
| year | yr | 0.000000031688739 |
Frequently Asked Questions
How many seconds are in a day?
86,400 — that is 24 × 60 × 60.
Why is a month 30.44 days here?
Because calendar months are 28 to 31 days. This converter uses the average Gregorian month (365.2425 ÷ 12) so that conversions stay consistent. For a specific month, count the actual days.
How many hours are in a year?
8,765.8 on average, usually rounded to 8,760 for a 365-day year.