Gregorian Leap Year Calculator

Q: What is the complete Gregorian leap year rule?

A year is a leap year if it is divisible by 4, unless it is divisible by 100, in which case it is only a leap year if it is also divisible by 400.

Q: When is the next leap year after 2024?

The next leap year is 2028, followed by 2032 and 2036.

Check whether any year has 365 or 366 days and test historical or future centuries against Gregorian leap rules.

Gregorian Leap Year Checker

Verify any historical or future year with mathematical 4 / 100 / 400 validation rules

Quick Year Presets

Enter Year to Test

Result for Year 2026

2026 is NOT a Leap Year (Common Year)

Total Year Days

365

February Length

28 Days

Divisible by 4?

No (✗)

Century Rule?

N/A (Non-Century)

Gregorian Algorithm Breakdown:

2026 is not divisible by 4, so it is a standard common year (365 days).

Previous Leap Years:

2024202020162012

Upcoming Leap Years:

2028203220362040

Find All Leap Years in a Span

From:

To:

Found 10 leap years (10 extra leap days) in 41 calendar years:

2008201220162020202420282032203620402044

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Step-by-Step Guide: How to Use Leap Year Calculator Online

1Enter any year (e.g., 2024, 2026, 2000, 2100) or choose a preset.
2Read the instant verification result and Gregorian rule breakdown.
3Explore upcoming leap years or use the span finder below to calculate ranges.
4Copy the verification report in one click.

Leap Year Calculator Features & Capabilities

Verifies leap years according to Gregorian 4, 100, and 400 rules
Shows February day count (28 vs 29 days) and total year days
Displays nearest previous and upcoming leap years
Range tool to find and count all leap years within any multi-decade span
Clear educational breakdown of why a given year is or is not a leap year

Technical Specifications & Privacy Standards

Supported Formats	Calendar Dates
Execution Architecture	100% Client-Side WebAssembly & HTML5 Canvas (Local CPU/GPU)
Server File Transfer	0 Bytes Transferred (Zero Cloud Uploads)
Output Quality	Lossless Vector & Original Resolution Maintained
Compatibility	Cross-Platform (Windows, macOS, Linux, iOS, Android)

Local Client-Side Processing Guarantee

Your files are processed locally in your browser memory and are not uploaded to our file-processing servers.

Leap Year Calculator FAQ

Why was the year 2000 a leap year but 1900 was not?

Under the Gregorian calendar, century years must be divisible by 400 to be leap years. 2000 is divisible by 400 (leap year), while 1900 is not (common year).

What is the complete Gregorian leap year rule?

When is the next leap year after 2024?