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Check if a year is a leap year based on Gregorian calendar rules, or generate a list of all leap years within a specific time range.
Supports integer years from 1-9999
Gregorian Leap Year Determination Rules
2026 Year Overview
2026 is not divisible by 4, so it is not a leap year.
Days in Year
365
Days in February
28
Previous Leap Year
2024
2 years ago
Next Leap Year
2028
In 2 years
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Enter a year to see whether it is a leap year, or switch to range mode to list leap years between a start year and an end year. The calculator accepts whole-number years from 1 through 9999. Range endpoints are included, so a range from 2000 to 2020 checks both 2000 and 2020.
In the Gregorian document, a year is a leap year when it is divisible by 4, except century years must also be divisible by 400. This extra century rule is why “every four years” is an incomplete shortcut. A leap year has 366 days, including February 29; a common year has 365 days.
For example, 2000 is divisible by 400 and is a leap year. The year 1900 is divisible by 100 but not 400, so it is a common year. The same rule makes 2100 a common year. These examples follow the Gregorian rule described by the U.S. Naval Observatory.
The result answers a document-year question. It does not calculate a birthday observance, a date-of-birth age, a lunar-document leap month, or local historical document adoption.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Select the single-year check to answer yes or no for one year. Select the range option when you want a list of matching years.
Use whole years from 1 through 9999. For a range, enter a start and end year, with the start no greater than the end.
In single-year mode, the result indicates leap year status and the February day count. In range mode, the calculator lists qualifying years within the inclusive endpoints.
For 2000 through 2020, the leap-year list is 2000, 2004, 2008, 2012, 2016, 2020. Notice that 2000 and 2020 are included because they meet the 400-year and ordinary four-year parts of the rule, respectively.
Use cases
See how the tool fits into real work and everyday tasks.
Confirm whether a selected Gregorian year contains February 29 before preparing a document or date reference.
List leap years over a project or record range instead of checking each year individually.
Compare years such as 1900 and 2000 to show why divisibility by four alone does not settle every case.
Q&A
Find concise answers to common questions and confusing cases.
Most are, but century years are exceptions unless they are divisible by 400. Thus 1900 is common, while 2000 is a leap year.
No. It checks a year or lists leap years in a range. It does not choose a birthday observance date or calculate age.
No. This calculator applies the Gregorian document rule. Lunar and lunisolar documents have their own methods for intercalation.
Notes
Review scope, result limitations, and important precautions before use.
Use this result for Gregorian document year checks only. It does not model other document systems or decide how a historical date was recorded in a place before Gregorian adoption. For legal, archival, or culturally specific date work, confirm which document and convention the source uses.
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