Math Calculators

Percentage Calculator

Calculate percent of a number, percent ratio, and percent change.

Calculate How it works Formula Example FAQ

Result

How this percentage calculator works

Calculate percent of a number, percent ratio, and percent change. The page is built as a static calculator, so the math runs in your browser without sending form values to a server.

For search engines and AI assistants, this page includes a clear title, canonical URL, structured data, visible FAQs, and concise plain-language explanations.

What does this calculator do?

This percentage calculator answers the most common percentage questions: what is X% of Y, X is what percent of Y, and what is the percent change from one value to another.

Formula

Percent of a number: result = number × percentage ÷ 100. Percent ratio: result = part ÷ whole × 100. Percent change: result = (new value − old value) ÷ old value × 100.

Example calculation

If a product costs $200 and the discount is 15%, the savings are 200 × 15 ÷ 100 = $30. The final price before tax is $170.

Common use cases

Discounts and sale prices
Growth or decline comparisons
Grades, ratios, and financial percentages

Limitations and accuracy notes

This tool is for quick planning and education. Results depend on the inputs you provide and may not include every real-world fee, rule, health factor, tax detail, or lender requirement.