A year has 365 days, or 366 days in a leap year. Leap years are years divisible by 4, except century years not divisible by 400, so the average Gregorian year is 365.2425 days.
365.2425 days
1 year = 365.2425 days
| Unit | Amount |
|---|---|
| Milliseconds | 31,556,952,000 |
| Seconds | 31,556,952 |
| Minutes | 525,949.2 |
| Hours | 8,765.82 |
| Days | 365.2425 |
| Weeks | 52.1775 |
| Months | 12 |
| Decades | 0.1 |
| Centuries | 0.01 |
A year is 365.2425 days on average (Gregorian calendar: 97 leap years every 400 years). A common year has 365 days (52 weeks and 1 day); a leap year has 366 (52 weeks and 2 days).
How it’s calculated
Every unit is converted through seconds: 1 minute = 60 s, 1 hour = 3,600 s, 1 day = 86,400 s, 1 week = 604,800 s. Months and years use the Gregorian average: 1 year = 365.2425 days = 31,556,952 s, 1 month = 1/12 year = 2,629,746 s.
Worked example with your numbers
- 1 year × 31,556,952 seconds per year = 31,556,952 seconds.
- 31,556,952 seconds ÷ 86,400 seconds per day = 365.2425 days.
Quick answer
A year has 365 days, or 366 days in a leap year.
- Common year
- 365 days
- Leap year
- 366 days
- Average year
- 365.2425 days
- Weekdays
- 260–262
2026 has 365 days — 52 weeks and 1 day — and 53 ISO weeks. Today is in ISO week 46. It has 261 weekdays (Monday–Friday).
| Year | Days | Weeks | ISO weeks | Hours | Seconds |
|---|---|---|---|---|---|
| 2025 | 365 | 52 + 1 day | 52 | 8,760 | 31,536,000 |
| 2026 | 365 | 52 + 1 day | 53 | 8,760 | 31,536,000 |
| 2027 | 365 | 52 + 1 day | 52 | 8,760 | 31,536,000 |
| 2028 (leap) | 366 | 52 + 2 days | 52 | 8,784 | 31,622,400 |
| 2029 | 365 | 52 + 1 day | 52 | 8,760 | 31,536,000 |
| 2030 | 365 | 52 + 1 day | 52 | 8,760 | 31,536,000 |
| 2031 | 365 | 52 + 1 day | 52 | 8,760 | 31,536,000 |
| 2032 (leap) | 366 | 52 + 2 days | 53 | 8,784 | 31,622,400 |
A common year is 365 days (52 weeks + 1 day, 8,760 hours); a leap year is 366 days (52 weeks + 2 days, 8,784 hours). Averaged over the 400-year Gregorian cycle a year is 365.2425 days = 52.1775 weeks = 8,765.82 hours. ISO 8601 numbers weeks Monday–Sunday; a year has 53 ISO weeks when it starts on a Thursday (or on a Wednesday in a leap year).
How it works
The leap day is February 29. 2000 was a leap year (divisible by 400); 1900 and 2100 are not (century years not divisible by 400).
Frequently asked questions
How many days are in two years?
730 days, or 731 when one of the two years is a leap year.
How many weekdays are in a year?
260 or 261 in a common year and 260 to 262 in a leap year, depending on the day the year starts.
How do I know if a year is a leap year?
It is divisible by 4 — except century years, which must be divisible by 400. The table marks the leap years.