Tre modalità: X % di Y, A è quale % di B, variazione percentuale.
Fractions represent parts of a whole number and are essential in mathematics.
Operations:
Fraction Types:
Always simplify fractions to their lowest terms for the most accurate representation.
Type the numerators and denominators. We support proper fractions, improper fractions, mixed numbers, and decimals.
Add, subtract, multiply, divide, simplify, or convert between forms. Each operation uses the standard math algorithm with step-by-step display.
See the answer in lowest terms, as a mixed number, and as a decimal. The fraction calculator also shows the common denominator used in the work.
For related calculations, try our decimal to fraction calculator.
I tre usi più comuni:
| Operazione | Formula | Esempio | Risultato |
|---|---|---|---|
| X % di Y | Y × X / 100 | 15 % di 200 | 30 |
| A è % di B | A / B × 100 | 50 è % di 200 | 25 % |
| Variazione % | (N − V) / V × 100 | Da 80 a 100 | +25 % |
**Gli sconti non si sommano**: 20 % + 10 % non fa 30 %, ma 28 % (20 % poi 10 % sul nuovo prezzo).
Cross-checked against authoritative formulas (IRS, NIST, ACSM) and updated for 2025/2026 tax years and rates.
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Each calculator includes the formula, plain-English explanation, and FAQs so you understand the result.
Estimates only. Calculator results are for educational and planning purposes — not professional advice. For binding decisions on taxes, investments, health, or legal matters, consult a qualified professional.
FAQ
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20% of $80 is $16. The formula: 80 x 0.20 = 16. Our percentage calculator does this in one click. The percentage calculator also handles reverse percentages (e.g. 16 is 20% of what number, answer: 80) and percentage change (e.g. 80 to 96 is a 20% increase).
How it works
Use the percentage calculator to find any percentage, percent change, discount, or tip in three steps.
Select what you want to compute: basic percentage, percent change, percent off (discount), or tip. Each mode has its own input fields.
Fill in the two numbers the calculation needs. For a discount, that is the original price and the discount percent. For a tip, that is the bill amount and tip percent.
The result appears immediately below the inputs, showing the computed value and a short explanation of what the numbers mean.
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