Ano Bissexto?
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
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About this calculator
The leap year calculator helps determine if a year is a leap year or not. A year is a leap year if it is divisible by 4, except for centuries not divisible by 400. This means that years like 2000 and 1900 are not leap years, while years like 2020 and 2024 are.
The formula used to calculate the leap year is simple: if the year is divisible by 4, but not by 100, or if it is divisible by 400, then it is a leap year.
It's worth noting that leap years are important in calendars and atomic clocks, as they affect time synchronization and dates. Additionally, some important events and dates may be affected by this.
If you need to determine if a year is a leap year, our calculator is a useful and quick tool to do so. Simply enter the year and click 'Calculate'.
Frequently asked questions
What is a leap year?
A year is a leap year if it is divisible by 4, except for centuries not divisible by 400.
Why is it important to know if a year is a leap year?
Leap years are important in calendars and atomic clocks, as they affect time synchronization and dates.
How does the leap year calculator work?
Simply enter the year and click 'Calculate' to determine if the year is a leap year or not.
What are the rules for determining a leap year?
The formula used is simple: if the year is divisible by 4, but not by 100, or if it is divisible by 400, then it is a leap year.
Why is the year 2000 not a leap year?
The year 2000 is not a leap year because it is a century not divisible by 400.