Percentage Calculator

Calculate percentages, proportions and percentage changes — fast and free.

What is X% of Y?

%
of

X is what percent of Y?

is ?% of

Percentage change from X to Y

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What Is a Percentage Calculator?

A percentage calculator helps you quickly solve common percentage problems: calculate a percentage value, determine the proportion of a number, or find the percentage change between two values. Percentage calculations are used constantly in everyday life — shopping (discounts), school, financial calculations and statistics.

Percentage Formulas

X% of Y = (X / 100) × Y  |  X is what % of Y = (X / Y) × 100  |  Percentage change = ((New − Old) / |Old|) × 100. These three basic formulas cover virtually all percentage problems.

Examples

  • 20% of 150 = (20 / 100) × 150 = 30 — e.g. a 20% discount on a $150 item saves $30.
  • 30 is what % of 200? = (30 / 200) × 100 = 15% — e.g. scoring 30 out of 200 points on a test equals 15%.
  • From 80 to 100 = ((100 − 80) / 80) × 100 = 25% increase — e.g. a stock price rising from $80 to $100.