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Leap Year Calculator : Check If a Year Is a Leap Year

The Leap Year Calculator checks whether any year on the Gregorian calendar is a leap year (366 days with February 29) or a standard common year (365 days) according to official astronomical rules.

Interactive Calculator

100% Client-Side Engine
Check Notable Years:
Leap Year Status
2026✗ Common Year
2026 is not divisible by 4, making it a standard common year.
Days in Year
365 days
Days in February
28 days
No Feb 29
Next Leap Years
2028, 2032, 2036
Previous Leap Years
2024, 2020, 2016

Step-by-Step Examples

Century Year 2000 vs 1900

Checking why 2000 was a leap year while 1900 was not.

Inputs: Year: 2000
Result: 2000 is a LEAP YEAR (366 Days, 29 Days in Feb) — Divisible by 400

Century years like 1600, 2000, 2400 are leap years; 1700, 1800, 1900, 2100 are not.

How to Use This Tool

  1. Enter any year between 1 and 9999.
  2. Click Calculate to see the mathematical rule breakdown, days in February, and the next 5 leap years.

Frequently Asked Questions

The Earth takes approximately 365.2422 days to orbit the Sun. Adding an extra day every 4 years (with century adjustments) keeps our calendar synchronized with astronomical seasons.

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