Percentage Calculator

Three quick calculators: X% of Y, X as a percentage of Y, and percentage change between two numbers.

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1. What is X% of Y?

2. X is what % of Y?

3. Percentage change (old → new)

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Common percentage formulas

  • X% of Y = (X ÷ 100) × Y
  • X as % of Y = (X ÷ Y) × 100
  • Percentage change = ((New − Old) ÷ |Old|) × 100

Handy for discounts, tips, taxes, grade calculations and growth rates.

Frequently Asked Questions

How do I calculate a 20% discount?

Multiply the price by 0.80, or use calculator 1: find 20% of the price, then subtract it.

What is percentage increase vs percentage points?

A rise from 10% to 15% is a 5 percentage-point rise but a 50% percentage increase.

Can it handle negative numbers?

Yes — percentage change works with negatives using the absolute value of the starting number.