Leap Calculator
Last updated: June 2026 · Free · No sign-up required
Enter values above and click Calculate to see your result instantly.
What the Leap Calculator does
Behind the inputs above sits one rule: Leap year if divisible by 4, except centuries not divisible by 400. The tool evaluates it instantly with the values you enter.
Scroll past the calculator for a quick-reference table, a step-by-step methodology with a fully worked example, and answers to the questions people most often ask about leap year calculator.
Quick reference
| Year | Leap? | Reason |
|---|---|---|
| 2024 | Yes | Divisible by 4 |
| 1900 | No | Century, not ÷400 |
| 2000 | Yes | Century ÷ 400 |
| 2026 | No | Not divisible by 4 |
functions Shows the working, not just the answer
For students and teachers, the final number is only half the value. Every math tool here exposes the formula it applied, the intermediate steps, and the rounding rule, so you can follow along, check your homework, or use the answer in a proof or report with confidence.
calculate Accurate to the spec
Calculations use 64-bit floating point with sensible rounding for the domain (currency to 2 decimals, percentages to 4 decimals, algebra to 6 significant figures). Where exact rational arithmetic matters — fractions, factorials, simplification — we use a dedicated BigNumber path so 1/3 + 1/6 returns ½, not 0.49999.
school Free for classroom use
Educators are welcome to link to any math calculator on CalcaTools from a class site, Google Classroom, or worksheet. The pages are mobile-friendly, free, ad-supported (so we can keep them free) and have no sign-up wall — students just click and use them in class or at home.
tips_and_updates Pair with the spoke articles
Below the calculator we link a small set of plain-English explainer pages — "What is a percentage?", "Why does PEMDAS matter?", and so on. They cover the underlying concept in 4–6 short paragraphs. Read those before the calculator if the topic is new, or after if you want the extra context.
Interpretation guide
| Result | Meaning |
|---|---|
| Leap year | 366 days, February has 29 |
| Common year | 365 days, February has 28 |
| Next leap year | Upcoming year with Feb 29 |
Formula & methodology
Formula: Leap year if divisible by 4, except centuries not divisible by 400
- Enter the four-digit year you want to test.
- Check divisibility by 4; if not divisible, it is a common year.
- If it is a century year, it must also be divisible by 400 to be a leap year.
- The tool reports leap status, February days, total days and the next leap year.
Example: 2028 is a leap year (divisible by 4 and not a century), so February has 29 days and the year has 366.