Time Converter
Convert between seconds, minutes, hours, days, weeks, months and years.
What the Time Converter does
Time conversion is exact up to weeks. Months and years vary in length, so this converter uses the average month (30.44 days) and the Julian year (365.25 days), which includes leap years.
Formula
Convert to second, then divide by the target unit's factorResult = Value × (from factor ÷ to factor)
Inputs explained
| Input | Unit | Required | Notes |
|---|---|---|---|
| Value | number | Yes | — |
| From | one of 9 options | Yes | — |
| To | one of 9 options | Yes | — |
How to use it
- Choose From and To.
- Enter Value.
- Select Calculate.
Worked example
Convert 3.5 hours to minutes.
- Value
- 3.5
- From
- Hour
- To
- Minute
3.5 × 60 = 210 minutes.
Reading the result
- Conversions up to weeks are exact. Anything expressed in months or years is an average, so treat those results as estimates rather than counts.
Assumptions and limitations
- A month is taken as 30.44 days and a year as the Julian year of 365.25 days, which averages leap years in.
- This is arithmetic on durations, not on the calendar. Use the date difference calculator when the answer has to land on a real date.
Common mistakes
- Scheduling real dates from average months. Thirty-six average months and three calendar years do not end on the same day.
- Assuming a year is exactly 365 days where precision matters — the missing quarter-day is what leap years exist to absorb.
Frequently asked questions
Why is a month 30.44 days?
It is the average calendar month: 365.25 days divided by 12. Individual months range from 28 to 31 days.