What this calculator does
Hours in a year is a fixed multiplication once the number of days in that year is settled: 24 hours in every one of them. This calculator handles the one part that is not fixed, which year length to use, offering a common 365-day year, a 366-day leap year, or the 365.25-day average that accounts for the leap year that occurs roughly every fourth year.
The figure also extends to any number of years, not just one, which is the more useful version of the question for a long-run total, such as the hours in a decade or in someone's working life to date.
The formula
The number of days is the year length selected multiplied by the number of years entered. That day figure is then multiplied by 24 to give hours, by a further 60 for minutes, and by 60 again for seconds.
| Term | Meaning |
|---|---|
| Common year | An ordinary 365-day year. |
| Leap year | A 366-day year, with the extra day added to February. |
| Average calendar year | 365.25 days, the long-run average once leap years are accounted for. |
The inputs explained
| Field | What to enter |
|---|---|
| Number of years | The number of years to convert. Fractions are allowed, such as 0.5 for half a year. |
| Year length | Which year length to use for the conversion: a common year, a leap year, or the long-run average. |
When to use it
Answering how many hours are in a year directly
A single common year comes to 8,760 hours, the figure most people mean when they ask the plain question.
Checking whether a leap year makes a meaningful difference
A leap year adds 24 extra hours to the total, one full day's worth, which is a small but sometimes relevant difference for a calculation that needs to be exact.
Totalling hours across several years
Entering a number of years greater than one gives the running total directly, useful for a long-run estimate such as total hours in a decade or in a length of service.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the total scales across a number of years
The running total of hours, days, minutes and seconds across an increasing number of years.
| Number of years | Hours | Minutes |
|---|---|---|
| 1 | 8,760 | 525,600 |
| 2 | 17,520 | 1,051,200 |
| 5 | 43,800 | 2,628,000 |
| 10 | 87,600 | 5,256,000 |
| 20 | 175,200 | 10,512,000 |
| 50 | 438,000 | 26,280,000 |
How the year length chosen changes the total
The same one-year conversion using each of the three year length options.
| Year length | Hours | Days |
|---|---|---|
| Common year | 8,760 | 365.00 |
| Leap year | 8,784 | 366.00 |
| Average year | 8,766 | 365.25 |
Questions
How many hours are in a year?
An ordinary 365-day year is 8,760 hours. A leap year, with its extra day in February, is 8,784 hours.
How many hours is a year on average, accounting for leap years?
About 8,766 hours, using the 365.25-day average calendar year that accounts for a leap year occurring roughly every fourth year.
How much hours are in a year of exactly 366 days?
8,784 hours: 366 days multiplied by 24 hours per day, selected here as the leap year option.
Why would I use the average year instead of a common or leap year?
The average is useful for a long-run calculation spanning many years, where using a plain 365-day year for every one of them would slightly understate the true total once leap years are accounted for.
For the equivalent conversion in minutes rather than hours, see the minutes in a year calculator. For a full day-and-month breakdown of a specific year, use the days in a year or month calculator.