Percentage Calculator
Solve any percentage problem instantly — discounts, tips, markups, grade scores and percent change. Type and watch the answer update live.
🧮 Calculate
Tip: works with decimals too — try 12.5% of 80.
✨ Answer
20% of 150
30
That's the result — live as you type.
As decimal
0.2
As fraction
1/5
Complement
120
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Common percentage formulas
X% of Y = (X ÷ 100) × Y
X is what % of Y = (X ÷ Y) × 100
% change = ((Y − X) ÷ X) × 100
Real-world uses: sale discounts ("30% off $150"), restaurant tips ("18% of $64"), exam scores ("42 out of 50"), and growth ("revenue grew from $20k to $26k = +30%").
Frequently asked questions
How do I calculate a discount?
Use "What is X% of Y" with the discount percent as X and the price as Y — then subtract the answer from the price.
What does percent change tell me?
How much a value grew or shrank relative to where it started. Positive = increase, negative = decrease.