Deterministic calculator

Percentage Calculator

Percent of a number, reverse percent, and percent change — fixed formulas, instant results.

What is X% of Y?

% of
Calculator result

X is what % of Y?

is what % of
Calculator result

Percentage change

to
Percentage change

Suggested workflow

  1. Fraction calculator
  2. Grade calculator
  3. AI math solver guide

How to calculate percentages

A percentage represents a number as a fraction of 100. The formula is: Percentage = (Part / Whole) × 100

For percentage change: Change = ((New − Old) / |Old|) × 100%

Related: try the fraction calculator when percents turn into fractions, or the grade calculator when the percentage is a class score.

Keep reading

Related guides on Gionth that go deeper on this topic.