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Percentage Calculator

Calculate percentages, increases & discounts

What is X% of Y?
Percentage (%)
Of Number

About Percentage Calculator

Three modes covering the most common percentage calculations: **X% of Y** — what is 20% of 150? (Answer: 30) Used for discounts, tax amounts, tips. **X is what % of Y** — 45 is what percent of 180? (Answer: 25%) Used for test scores, ratios, proportions. **% change from X to Y** — from 80 to 100 is what change? (Answer: +25%) Used for growth rates, price changes, performance metrics.

Common Use Cases

  • →Working out discount prices — 20% off £149 = £119.20
  • →Calculating VAT — 23% on €500 = €615 total
  • →Finding percentage change between two figures
  • →Working out what percentage of a target has been reached

Frequently Asked Questions

How do I calculate a percentage manually?+
X% of Y = (X ÷ 100) × Y. Example: 15% of 200 = 0.15 × 200 = 30.
How is percentage change calculated?+
((new - old) ÷ old) × 100. A positive result is an increase, negative is a decrease. Example: from 80 to 100 = ((100-80) ÷ 80) × 100 = 25% increase.
Percentage change vs percentage difference?+
Percentage change measures movement from a baseline (implies direction). Percentage difference measures the relative gap between two values with no implied baseline — useful when neither value is the "before" state.