How many hours in a year?
8,760 hours in a regular year. 8,784 in a leap year.
Regular year
8,760
365 days × 24 hours
Leap year
8,784
366 days × 24 hours
A year, in every unit
| Unit | Regular year (365 days) | Leap year (366 days) |
|---|---|---|
| Days | 365 | 366 |
| Weeks | 52 weeks + 1 day | 52 weeks + 2 days |
| Hours | 8,760 | 8,784 |
| Minutes | 525,600 | 527,040 |
| Seconds | 31,536,000 | 31,622,400 |
The math
Hours in a year = days in the year × 24.
That's it. No averaging, no work-week assumptions. The only question is whether the year is a leap year (366 days) or a regular year (365).
For a finer breakdown, see how each unit (day, hour, second) is defined.
Why a year isn't exactly 365 days
The Earth takes about 365.2422 days to orbit the Sun (the "tropical year"). Our civil calendar uses whole days, so we'd drift out of sync with the seasons by ~6 hours a year — about a full day every 4 years.
The Gregorian leap rule (introduced 1582) corrects this:
- A year divisible by 4 is a leap year (e.g. 2024).
- Except: a year divisible by 100 is not a leap year (e.g. 1900).
- Except the exception: a year divisible by 400 is a leap year (e.g. 2000).
This produces 97 leap years per 400-year cycle, averaging 365.2425 days per year — accurate to within ~26 seconds annually. The next century year that is not a leap year is 2100.
Calculate any time period
Quick Examples:
From
1 Hours
To
0 Days
All Conversions:
Frequently asked questions
How many hours in a year, exactly?
8,760 in a regular year. 8,784 in a leap year. The 24-hour difference is February 29.
Was the year 2000 a leap year?
Yes. 2000 is divisible by 400, so the "century years are not leap years" rule did not apply. The next century year that is not a leap year is 2100.
How many work hours in a year?
The U.S. standard is 2,080 (52 weeks × 40 hours), per the Fair Labor Standards Act. After typical PTO and holidays, actual worked hours are lower — see the work-year breakdown.
What's the average year length over a long period?
Averaged over the 400-year Gregorian cycle: 365.2425 days = 8,765.82 hours per year. This is the figure to use for very-long-term calculations like century-scale interest accruals or astronomical projections.