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Time converters

14 converters. Seconds to years and back, each with the formula and the math worked out with your numbers.

Clock time

Minutes to hours min → h 90 min = 1.5 h Hours to minutes h → min 2.5 h = 150 min Seconds to minutes s → min 150 s = 2.5 min Minutes to seconds min → s 5 min = 300 s Milliseconds to seconds ms → s 1,500 ms = 1.5 s Seconds to milliseconds s → ms 2.5 s = 2,500 ms

Days & calendar

Hours to days h → d 72 h = 3 d Days to hours d → h 3 d = 72 h Days to weeks d → wk 30 d = 4.29 wk Weeks to days wk → d 6 wk = 42 d Days to years d → yr 1,000 d = 2.74 yr Years to days yr → d 2 yr = 730.49 d Months to days mo → d 3 mo = 91.31 d Weeks to months wk → mo 12 wk = 2.76 mo

Time units at a glance

Unit	Symbol	In seconds	Defined as
Millisecond	ms	0.001	1/1,000 s
Second	s	1	SI
Minute	min	60	60 s
Hour	h	3,600	60 min
Day	d	86,400	24 h
Week	wk	604,800	7 d
Month	mo	2,629,746	30.436875 d
Year	yr	31,556,952	365.2425 d

Months and years are average Gregorian calendar lengths: a year is 365.2425 days and a month is a twelfth of that.