Is this year a leap year?
Enter a four-digit year—or tap presets like 2024, 2025, and 2100. See leap vs common year, total days (365/366), and February length.
Gregorian rules (short)
Divisible by 4 → usually leap; century years must be divisible by 400 (2000 yes, 1900 and 2100 no). That matches how countdown and date-difference tools count February.
Next steps
Only leap years have Feb 29—check its weekday with the day-of-week calculator, or count down with the countdown calculator.
More tools: date & time hub.
Frequently asked questions
Is 2024 a leap year?
Yes—2024 is divisible by 4 and not a century exception year: 366 days, February 29.
Is 2100 a leap year?
No—2100 is divisible by 100 but not by 400, so it is not a leap year (Feb has 28 days). Try the 2100 preset on this page.
How is a leap year decided?
Gregorian rule: divisible by 4 → usually leap; century years must be divisible by 400 (2000 yes, 1900 no).
Leap years and countdown days?
Spanning Feb 29 affects countdown and days-until totals—use this page to check the year first.
How many days in February?
28 in common years, 29 in leap years—plus 365 vs 366 for the full year.
Can I save my inputs?
Yes. Copy link below the form keeps your current inputs so you can share the scenario or save it for later.
Use with the weekday tool?
Only leap years have Feb 29—find its weekday with the day-of-week calculator.
Other date tools?
The date & time hub includes add/subtract days and business days.