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Time Unit Converter
Convert between seconds, minutes, hours, days, weeks, months, and years instantly. Essential for project scheduling, programming timestamps, scientific calculations, and understanding time spans in different units.
Time conversion is fundamental in scheduling, programming, and science. The second is the SI base unit of time, defined since 1967 as 9,192,631,770 oscillations of a cesium-133 atom. Everything else — minutes, hours, days — are multiples of seconds.
Seconds, Minutes, and Hours
1 minute = 60 seconds. 1 hour = 3,600 seconds. 1 day = 86,400 seconds. In programming, Unix timestamps count seconds since January 1, 1970. Databases and APIs often work in milliseconds (1 second = 1,000 ms).
Days, Weeks, and Years
1 week = 7 days = 604,800 seconds. 1 average year = 365.25 days = 31,557,600 seconds (accounting for leap years every 4 years). A decade = 10 years. A century = 100 years. A millennium = 1,000 years.
Unit
Seconds
Hours Equivalent
1 minute
60
0.0167 hr
1 hour
3,600
60 min
1 day
86,400
24 hr
1 week
604,800
168 hr
1 month (avg)
2,629,800
730.5 hr
1 year (avg)
31,557,600
8,766 hr
Frequently Asked Questions
86,400 seconds in one day: 24 hours x 60 minutes x 60 seconds = 86,400. In a leap year (366 days) there are 31,622,400 seconds. The entire year averages to 31,557,600 seconds when accounting for leap years.
365.25 days x 24 hours x 60 minutes = 525,960 minutes (average). Exactly 365 days = 525,600 minutes. A common year has 525,600 minutes; a leap year has 527,040 minutes.
7 days x 24 hours = 168 hours per week = 10,080 minutes = 604,800 seconds. A 40-hour work week is 40/168 = 23.8% of all available weekly hours.
Divide minutes by 60 and add to whole hours. Example: 2 hours 45 minutes = 2 + 45/60 = 2.75 decimal hours. At $20/hr this equals $55.00 pay, which is simpler to calculate than using hours and minutes.
1 second = 1,000 milliseconds (ms) = 1,000,000 microseconds (us) = 1,000,000,000 nanoseconds (ns). Internet latency is measured in ms; CPU clock cycles in nanoseconds.
A sidereal day is 23 hours, 56 minutes, 4 seconds — the time for Earth to rotate 360 degrees relative to distant stars. A solar day is 24 hours (relative to the Sun). The 4-minute difference explains why stars appear 4 minutes earlier each night.