Skip to main content
Book Consultation →
Age and dates100% FreeInstant

Leap Year Checker: Is This Year a Leap Year?

This free leap year checker tells you if any year is a leap year, explains the rule that decides it, and shows the previous and next leap years, plus a list of leap years in a range.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is It and When Do You Need It?

A leap year has 366 days, with an extra day, 29 February. The rule is simple but has exceptions that catch many people out, such as the year 1900, which was not a leap year, and 2000, which was.

Enter a year to test it. You can also enter a second year to list every leap year in between.

How to Use This Tool

  1. Type a year.
  2. Optionally type an end year to list all leap years in the range.
  3. Press Check.
  4. Read the answer and the rule that applies.

How the Calculation Works

The Gregorian calendar rule is: divisible by 4 means leap, but divisible by 100 means not leap, unless divisible by 400, which means leap again. This gives 97 leap years in every 400 years, an average year of 365.2425 days.

Worked Example

2028 is a leap year (divisible by 4). 2100 is not (divisible by 100, not 400). 2400 is. The leap years from 2024 to 2040 are 2024, 2028, 2032, 2036 and 2040.

Common Uses

  • Programming and date calculations.
  • Planning events on 29 February.
  • School and quiz questions.
  • Checking calendars and contracts.

Tips and Common Mistakes

  • Century years are leap only when divisible by 400.
  • February has 29 days in a leap year and 28 otherwise.
  • The rule applies from the Gregorian reform of 1582 on.

Next, you may need the day of the week calculator, age calculator, date add and subtract calculator, date difference calculator.

Everything runs in your browser. Nothing you type is uploaded, stored or sent to any outside service.

Frequently Asked Questions

A year is a leap year if it is divisible by 4, except that years divisible by 100 are not, unless they are also divisible by 400.
No. 2100 is divisible by 100 but not by 400, so it is a common year. 2000 was a leap year, because it is divisible by 400.
A solar year is about 365.2425 days. Adding one day roughly every four years keeps the calendar in step with the seasons.
You have an official birthday only in leap years. Many people celebrate on 28 February or 1 March in other years.

Disclaimer: results are calculated in your browser from the numbers you enter. Check important results before you rely on them for money, health, safety or legal decisions.