How Many Days Are in a Year?

A common year has 365 days; a leap year has 366. Here's the rule behind it, plus how a year breaks down into weeks, months, hours and seconds.

365 or 366
365 days in a common year · 366 days in a leap year (with February 29)
52 + 1
Weeks + days
12
Months
8,760
Hours (365d)
525,600
Minutes (365d)
Clear, sourced answer No sign-up

365, 366, and the leap-year rule

Earth takes about 365.2422 days to orbit the Sun. Since a calendar can't have a fraction of a day, the Gregorian calendar uses 365 days in a normal ("common") year and adds a 366th day — February 29 — in leap years to catch up the accumulated quarter-days.

A year is a leap year if it's divisible by 4, except century years, which must also be divisible by 400. So 2024 and 2000 are leap years (366 days), while 1900 and 2100 are common years (365 days). You can check any year with the leap year checker.

How a year breaks down

Days per year, 2024–2033

YearDaysType
2024366Leap year
2025365Common year
2026365Common year
2027365Common year
2028366Leap year
2029365Common year
2030365Common year
2031365Common year
2032366Leap year
2033365Common year

Related tools

Leap year checker Date calculator Week number Full-year calendar

Frequently Asked Questions

How many days are in a year?
A common year has 365 days. A leap year has 366, with the extra day added as February 29. Leap years occur roughly every four years to keep the calendar aligned with Earth's ~365.2422-day orbit.
How many weeks are in a year?
52 weeks plus 1 day (52 weeks and 2 days in a leap year), because 52 × 7 = 364. Under ISO-8601 week numbering, most years have 52 weeks and some have 53.
How many days are in a year on average?
Averaged over the 400-year Gregorian cycle, a year is 365.2425 days — very close to the true solar year of 365.2422 days, so the calendar drifts only about a day every 3,000 years.
How many hours, minutes and seconds are in a year?
A 365-day year has 8,760 hours, 525,600 minutes and 31,536,000 seconds. A 366-day leap year has 8,784 hours, 527,040 minutes and 31,622,400 seconds.