Time Converter
Convert between ms, seconds, minutes, hours, days, weeks, months, and years.
Frequently asked questions
How many seconds in a year?
A Julian year (365.25 days) = 31,557,600 seconds. A Gregorian year averages 365.2425 days = 31,556,952 seconds. The classic approximation "approximately π × 10⁷ seconds" (31,415,927) is accurate to within 0.5%.
Why is the month value an average?
Calendar months vary from 28 to 31 days, so there is no exact conversion to seconds. This converter uses the average of 30.4375 days per month (365.25 / 12), which gives accurate results for rough estimates but will differ from exact calendar month counts.
How many hours in a week?
Exactly 168 hours. A week = 7 days × 24 hours = 168 hours = 10,080 minutes = 604,800 seconds. This is an exact figure with no averaging required.
