Leap Year Checker

What is the Leap Year Checker?

Check whether a year is a leap year and find the next leap years. Leap years follow a rule with century exceptions, which trips up spreadsheets, date code and even official forms.

How to use the Leap Year Checker

1. Enter your year.
2. Results update automatically as you type; you can also press Calculate.
3. Read the output: leap year?, next leap years.
4. Use the 📊 chart to see the result visually, then copy or share it.

Formula and method

Worked example

With year = 2,028, the Leap Year Checker returns leap year?: Yes — 2028 has 366 days; next leap years: 2032, 2036, 2040, 2044, 2048.

Where the Leap Year Checker helps in real life

You are building a payroll calendar that crosses February 2028 and need to know whether it has 29 days. The checker confirms it and lists the next leap years.

Your niece was born on February 29 and wants to know when she can next celebrate on her actual birthday. The list of upcoming leap years answers that.

Common mistakes to avoid

• Assuming every year divisible by 100 is a leap year.
• Forgetting that 2000 was a leap year but 1900 was not.
• Hard-coding 365 days a year in date calculations.
• Assuming leap years occur exactly every four years forever.

💡 Practical tip: 2100 will not be a leap year, even though it is divisible by 4.

Tips for better results

• Remember the rule: divisible by 4, except centuries unless divisible by 400.
• Use proper date libraries in code rather than manual math.
• Check leap years when planning anything that spans February.

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