Time Conversion Calculator
Time Conversion Calculator
This is a general-purpose time-unit converter for any duration — from milliseconds up to years — useful for anything from converting a stopwatch split to planning a project timeline in weeks or months.
The smaller units convert exactly: a day is always precisely 24 hours, 1,440 minutes, or 86,400 seconds, with no rounding involved. Months and years, by contrast, are necessarily approximations here, since calendar months vary from 28 to 31 days — this converter uses the average Gregorian month (30.44 days) and year (365.2425 days) for those conversions, which is accurate for general planning purposes but isn't the right tool for exact calendar-date arithmetic like "what date is 3 months from March 15th" — the Date Difference and Date ± Calendar Units calculators handle that exact-date case correctly instead.
- Exact relationships: 1 day = 24 hours = 1,440 minutes = 86,400 seconds exactly.
- Months and years are averages: since calendar months vary from 28-31 days, this converter uses the average Gregorian month (30.44 days) and year (365.2425 days) — for exact calendar-date math, use the Date Difference Calculator instead.
- Fully flexible: change either dropdown to convert between any two of the eight supported time units.
How many seconds are in a day?
Exactly 86,400 seconds (24 × 60 × 60).
Why use an "average" month instead of an exact one?
A pure duration converter has no specific calendar month to reference — the average (30.44 days) is the standard convention for duration-only conversions. For date-to-date arithmetic, use a calendar-aware tool instead.
Time Conversion Calculator
This is a general-purpose time-unit converter for any duration — from milliseconds up to years — useful for anything from converting a stopwatch split to planning a project timeline in weeks or months.
The smaller units convert exactly: a day is always precisely 24 hours, 1,440 minutes, or 86,400 seconds, with no rounding involved. Months and years, by contrast, are necessarily approximations here, since calendar months vary from 28 to 31 days — this converter uses the average Gregorian month (30.44 days) and year (365.2425 days) for those conversions, which is accurate for general planning purposes but isn't the right tool for exact calendar-date arithmetic like "what date is 3 months from March 15th" — the Date Difference and Date ± Calendar Units calculators handle that exact-date case correctly instead.
- Exact relationships: 1 day = 24 hours = 1,440 minutes = 86,400 seconds exactly.
- Months and years are averages: since calendar months vary from 28-31 days, this converter uses the average Gregorian month (30.44 days) and year (365.2425 days) — for exact calendar-date math, use the Date Difference Calculator instead.
- Fully flexible: change either dropdown to convert between any two of the eight supported time units.
How many seconds are in a day?
Exactly 86,400 seconds (24 × 60 × 60).
Why use an "average" month instead of an exact one?
A pure duration converter has no specific calendar month to reference — the average (30.44 days) is the standard convention for duration-only conversions. For date-to-date arithmetic, use a calendar-aware tool instead.