Beyond the yes-or-no answer the tool lists the next five leap years, the exact date of February 29 in the selected year, and the day of the week it falls on. It is a quick reference for developers handling date logic, for anyone born on 29 February, and for checking annual contracts that run on a 366-day cycle. To see how many days a specific date range contains, try the Days Between Dates Calculator.
Calculator
Formula used
Leap year ⇔ (year % 4 = 0 AND year % 100 ≠ 0) OR year % 400 = 0
How to use the Leap Year Checker
- Type the year you want to check.
- Read whether it is a leap year and how many days it has.
- Check the date and weekday of 29 February in that year.
- Use the list of upcoming leap years for planning.
About this tool
The Leap Year Checker is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Checking whether February has 29 days in a given year.
- Debugging date logic in spreadsheets or code.
- Planning birthdays for people born on 29 February.
- Understanding why some century years are skipped.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Why was 1900 not a leap year?
Century years must be divisible by 400. 1900 is divisible by 100 but not by 400, so it was skipped; 2000 was a leap year because it is divisible by 400.
When is the next leap year?
Leap years occur every four years, so the next one is at most four years away. The result panel lists the next five.
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