how often is leap year

A leap year occurs approximately every four years. It adds an extra day, February 29, to keep the calendar year synchronized with the Earth's orbit around the Sun, which takes about 365.242190 days. Leap years usually happen if the year is divisible by 4, except for years divisible by 100 unless they are also divisible by 400. This means some century years like 1900 are not leap years, but 2000 was. The next leap years after 2024 will be 2028, 2032, and so on.