How it works
Convert lengths of time from nanoseconds up to centuries. Seconds, minutes, hours, days and weeks have fixed lengths, so those conversions are exact.
Months and years vary in length, so this converter uses averages from the Gregorian calendar: a year of 365.2425 days and a month of one-twelfth of that, 30.436875 days. For calendar dates, use a date calculator instead.
Formula
Result = value × (seconds per from-unit) ÷ (seconds per to-unit)
Questions people ask
How many seconds are in a day?
86,400 seconds (24 × 60 × 60).
How many hours are in a year?
8,760 hours in a 365-day year, 8,784 in a leap year, and about 8,765.82 for the average Gregorian year used here.
How many weeks are in a year?
About 52.18 weeks: 52 weeks and 1 day in a common year, and 52 weeks and 2 days in a leap year.