Leap Years List

A leap-year list is a forward table, not a single yes-or-no verdict. Enter a start year and the calculator walks ahead through the Gregorian calendar, naming each leap year in order until a planning window of upcoming February 29 dates is filled. Software contracts, school packets that mention leap day, and people born on February 29 all need that sequence, not merely a flag for one isolated year.

The Gregorian leap rule in one paragraph

A year is a leap year when it is divisible by four, except that most century years are not leap years. A century year remains a leap year only when it is also divisible by four hundred. That extra filter keeps the civil calendar from drifting too far from the seasons. The list on this page applies that rule year by year; it does not guess from a simple “every four years” shortcut that fails at century boundaries.

The leap year page answers a different question: is this one year a leap year, and when is the next February 29 if it is not. Use that page for a single checkbox. Use this list when a schedule, a contract exhibit, or a classroom poster needs many leap years in a row.

What the table actually prints

The form takes a start year. The result states whether that start year itself is a leap year, then lists the next twenty Gregorian leap years from that point. Twenty is a planning horizon, not a physical limit of the calendar. Each listed year contains a February 29 in the civil calendar used on this site. The weekday of that February 29 is not the focus here; the years themselves are.

If the question is the next occurrence of the date February 29 rather than a column of years, open next leap day. That sibling is a single target date. This page is the series.

Why century years break the four-year habit

People remember “leap year every four years” because that is true for most of a lifetime. The exception is easy to miss when a table is built by adding four repeatedly without testing century years. A list generator that skips the four-hundred rule will eventually name a year that has no February 29. Spreadsheets that start from a known leap year and add four forever make that mistake at the first century that is not divisible by four hundred.

This calculator tests each year independently. That is slower to describe and safer to trust. When a long-range exhibit will be printed, run the list from the exhibit’s first year rather than extending a handwritten sequence from memory.

February 29 birthdays and legal age rules

People born on February 29 celebrate in common years on February 28 or March 1 depending on family custom and, in some places, on statute. A multi-year list helps families see how often the true date returns and how clustered or sparse those years are. It does not decide which substitute day a jurisdiction uses for age of majority or license renewal. Those questions belong to local law, not to a calendar table.

HR systems that store birthdays as month-day pairs without a year still need to know which years contain February 29 when they schedule greetings or benefits. Feeding this list into a lookup table is safer than hard-coding a four-year cycle that will fail at a century boundary years from now.

Software, logs, and February 29 crashes

Date libraries that reject February 29 in leap years, or that accept it in common years, still appear in production. A forward list is a cheap test fixture: pick the next several leap years, assert that February 29 parses, then pick intervening common years and assert that it does not. QA calendars that only test “this year” miss the next leap day until it arrives.

Cron expressions that fire on day 29 of February run only in leap years. Operators who schedule a “once every four years” job should still verify the next few leap years on this page so a century skip does not silently cancel a job that was supposed to run.

School packets and printed almanacs

A science unit on calendar reform can show the list beside a monthly grid from the 2026 yearly calendar so students see both the rule and a concrete February. Asking students to predict the next leap year by adding four, then checking the list, surfaces the century exception without a lecture.

Printed almanacs that include a “coming leap years” sidebar should regenerate that sidebar from a start year each edition. Copying last year’s sidebar and adding four to every entry is the same shortcut the century rule exists to stop.

Leap years and ISO week 53

Years with 53 ISO weeks are related to weekday alignment and leap status, but a leap year does not automatically have 53 ISO weeks. Do not treat this list as a week-53 calendar. When a warehouse labels cartons by ISO week, convert week numbers on their own hub; use this page only to know which years contain the extra February day.

Day-of-year numbers after February also shift in leap years. Logistics codes that stamp day 60 as March 1 are wrong in leap years, when day 60 is February 29. The list tells planners which years need the extra row in those tables.

How far ahead to look

Twenty leap years cover several decades of civil planning — long enough for venue contracts, software support windows, and childhood through early adulthood for a leap-day birthday. Enter 2026 to see the stretch that starts now, or enter a later year for a contract that begins in the future. The list always walks forward; it is not a historical catalog of past leap years, though a past start year will include later years that have already occurred relative to today.

Astronomers and historians who need Julian-calendar leap rules, or proleptic Gregorian dates before the calendar reform, should not use this civil list as an authority. The page is a Gregorian planning table for ordinary years people type into a form.