There are 8,760 hours in a regular calendar year with 365 days.
Basic calculation
A common year has 365 days, and each day has 24 hours, so the total is 365×24=8,760365\times 24=8{,}760365×24=8,760 hours. A leap year has 366 days, so it contains 366×24=8,784366\times 24=8{,}784366×24=8,784 hours.
Other year types
On average, taking both regular and leap years into account, a calendar year is about 365.24 days long, which is roughly 8,766 hours. Astronomical definitions like the Julian year also use 365.25 days, giving exactly 8,766 hours.
