Convert one time unit to another.
Choose a conversion pair to open a working calculator with the factor and reverse check shown. Calendar-average conversions are kept separate from fixed time-unit relationships.
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Fixed time-unit conversions
Seconds, minutes, hours, days and weeks use fixed multiplicative relationships.
Hours to MinutesFixed unit factorMinutes to HoursFixed unit factorSeconds to MinutesFixed unit factorMinutes to SecondsFixed unit factorDays to HoursFixed unit factorHours to DaysFixed unit factorWeeks to DaysFixed unit factorDays to WeeksFixed unit factorMilliseconds to SecondsFixed unit factorSeconds to MillisecondsFixed unit factorHours to SecondsFixed unit factorSeconds to HoursFixed unit factorWeeks to HoursFixed unit factorHours to WeeksFixed unit factorMinutes to MillisecondsFixed unit factor
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Calendar-average conversions
Month and year conversions use a labeled mean Gregorian factor because calendar months and years do not all have the same length.