Calculator 1 — What is X% of Y?
Calculator 2 — X is what % of Y?
Calculator 3 — % Change from X to Y
Everyday percentage tips
- Quick tip calculation: multiply the bill by the tip percentage and move the decimal. $48 × 20% = $48 × 0.2 = $9.60. Or just divide by 5 for a 20% tip.
- For discounts: subtract the discount percentage from 100, then multiply. A 30% off sale means you pay 70% of the original price. $80 × 0.7 = $56.
- Grade percentages: if you scored 43 out of 55, divide 43 by 55 then multiply by 100 = 78.2% — which is a B+/C+ depending on your grading scale.
- Compound percentage changes don't add: a 20% increase followed by a 20% decrease doesn't return to the original — it results in a 4% net decrease (the classic trap in finance).
Three percentage calculations you'll use every day
Percentages appear everywhere: sales discounts, exam scores, financial returns, tax rates, and tip calculations. This tool covers the three most common scenarios — finding what X% of a number is (e.g., 20% of $500), finding what percentage one number is of another (e.g., 75 out of 300), and calculating the percentage change between two values (e.g., a price rising from $100 to $125).
All three calculators update in real time as you type, so there's no button to press — just fill in your values and the answer appears immediately.
Frequently asked questions
How do I calculate a percentage?
To find X% of Y: multiply Y by X, then divide by 100. For example, 15% of $60 = 60 × 15 ÷ 100 = $9. Alternatively, convert the percentage to a decimal (15% = 0.15) and multiply: 60 × 0.15 = $9. The decimal method is faster when using a calculator.
What is percentage change?
Percentage change measures how much a value has increased or decreased relative to its original value. Formula: ((New − Old) / |Old|) × 100. A positive result is an increase; a negative result is a decrease. It's used in finance (stock returns), economics (inflation), and performance tracking (sales growth, website traffic changes).
How do I calculate percentage of a total?
Divide the part by the whole and multiply by 100. For example, if 45 students passed out of 60 total: 45 ÷ 60 × 100 = 75%. This is used for market share (your sales ÷ total market), class participation rates, conversion rates (conversions ÷ visitors), and countless other ratios.
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