Average days per year?

Answer:
You need to account for the leap years. It's done like that:
A leap year is every year divisible by 4 (unless it's divisible by 100 (unless it's divisible by 400)).

365 + 1/4 − 1/100 + 1/400 = 365.2425 days in one year on average

Sometimes people think the answer is 365.25. This is incorrect and assumes that every 4th year is a leap year, while in fact it's not. Actually it's approximately every one year in 4,12 years.
Contributor: Herman
First answer by ID1279778837. Last edit by Herman Proosa. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 2 [recommend question].