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Leap Year Checker

Check if a year is a leap year online

What is the Leap Year Checker?

The leap year checker works like this: it applies the Gregorian rule - divisible by 4, except centuries, unless divisible by 400 - and explains the verdict. Everything happens on your device - the input never leaves your tab unless the tool clearly states it performs a server-side lookup.

How to use the Leap Year Checker

1. Enter the date, time or duration you start from.
2. Add the operation's parameters.
3. Read the result, which updates live.
4. Copy values you need elsewhere.

Features

• Check if a year is a leap year online
• Instant result, no page reload
• Works in any modern browser, desktop or mobile
• Free with no signup

Common mistakes to avoid

• Swapping day and month when entering dates

Examples

Input	Result
2000	Leap year (divisible by 400) · 1900 was not · 2100 will not be

Best used for

• Getting a reliable answer for leap year checker without installing an app
• One-off tasks done in under a minute from any device
• Checking results before committing them to something important
• Working on a phone where desktop software is unavailable

Privacy

Date math runs locally in your browser.

Frequently asked questions

Why does the 400 rule exist?

The 365.2425-day tropical year is 11 minutes short of 365.25 - dropping 3 leap days per 400 years keeps seasons aligned with the calendar.

What is the full leap-year rule?

Divisible by 4, except century years, which must be divisible by 400 - so 2000 was a leap year, 1900 was not, and 2100 will not be. The verdict comes with the reasoning applied to your year.

Why does the century exception exist?

The average Gregorian year stays aligned with the solar year - dropping three leap days every four centuries keeps the calendar from drifting against the seasons.

More like this

Zoven offers 200+ free browser tools. Browse by category - Calculators, Converters, Generators, Developer Tools and Media Tools - or read workflow guides on the Zoven blog.