Converter and calculator

Percentage Calculator

Calculate percentages instantly: what is X% of Y, what percentage is X of Y, percentage increase/decrease, and more.

How to use Percentage Calculator

Unit converters guide for percentage calculator users.

Percentage calculations are needed constantly - tip calculations, discount pricing, grade calculations, tax, interest, and growth rates. This tool handles the four most common types: finding a percentage of a number, finding what percentage one number is of another, percentage increase, and percentage decrease.

Calculator modes

1) What is X% of Y? 2) X is what % of Y? 3) Percentage increase from X to Y. 4) Percentage decrease. 5) Add/subtract a percentage from a value.

How to use it

Select the calculation type. Enter the values. The result updates instantly.

Common examples

20% tip on $45 = $9. 15% off $80 = $68. Score 72/90 = 80%. Growth from 100 to 125 = 25% increase.

Quick checklist

For discounts: 'What is X% of Y' gives the discount amount. Subtract from original for the sale price.
For tips: find X% of the bill total.
For grade: 'X is what % of Y' - score is X, total possible is Y.
For growth: use percentage increase mode with old value and new value.

Answers

Percentage Calculator FAQs

What is 15% of 200?

200 × 0.15 = 30.

What percentage is 45 of 60?

(45 ÷ 60) × 100 = 75%.

What is a 20% increase on 150?

150 × 1.20 = 180.

How do I calculate a 30% discount?

Multiply the original price by 0.30 to get the discount amount. Subtract from original: 100 × 0.30 = 30 off, so 70 is the sale price.

Methodology and examples

Percentage Calculator: formula, example, and use cases

Maintained by FormatNest. Verify assumptions and sources before using results.

Formula or method

Percentage amount = base × rate ÷ 100; the page also supports reverse percentage and difference calculations.

Worked example

Example: enter 15 and 200 to calculate 15% of 200, then compare the result with the original amount.

Best use cases

Use it for discounts, tips, markups, grades, and everyday comparisons.

Important: Check the assumptions and inputs before relying on this estimate for an important decision.

Editorial note: Review the input definitions, units and assumptions before relying on results. FormatNest methodology and privacy.