How do I calculate a percentage?

To find what percent A is of B: (A ÷ B) × 100. To find X% of a number: number × (X ÷ 100). For example, 15% of $200 = 200 × 0.15 = $30.

Percentage Calculator

Estimate percentage relationships and percentage-of-base amounts.

This tool runs in your browser. None of your data is saved or sold.

Part

Whole

Percent (%)

Base amount ($)

About This Calculator

This calculator handles the three core percentage problems: what percentage is X of Y, what is X percent of Y, and what is the ratio between two numbers. These calculations appear constantly in personal finance, investing, business analysis, and everyday decision-making.

Estimates only — not financial, tax, legal, or investment advice. Verify important results with a qualified professional before making decisions.

part as % of whole = part ÷ whole × 100; % of base = base × percent ÷ 100; ratio = part ÷ whole