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Common year
8,760
hours
8,784 in leap years
Quick Answer
A standard (common) year has 8,760 hours. A leap year has 8,784 hours — exactly 24 more hours due to February 29th.
Formula: Total Hours = Days in Year × 24
Common year: 365 × 24 = 8,760 hours
Leap year: 366 × 24 = 8,784 hours
Why It Changes: Leap Year Explained
The Gregorian calendar adds a 366th day (February 29) every 4 years to keep the calendar aligned with Earth's orbit. A year is a leap year if it is divisible by 4 — except for century years, which must also be divisible by 400. So 2024 and 2028 are leap years, but 1900 was not; 2000 was.