Percentage Calculator

LOCAL · Browser-Only

Calculate percentages, percentage change, tips, discounts, margins, and more

Basic

Applied

What is X% of Y?

Percentage (%)

Number

Result

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Quick Reference

Percentage Formulas Reference

Calculation	Formula
X% of Y	(X / 100) x Y
X is what % of Y	(X / Y) x 100
X is Y% of what	X / (Y / 100)
% Change	((New - Old) / \|Old\|) x 100
% Difference	(\|A - B\| / ((A + B) / 2)) x 100
Increase by %	Value + (Value x %/100)
Decrease by %	Value - (Value x %/100)
Profit Margin	(Profit / Selling Price) x 100
Markup	(Profit / Cost Price) x 100

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What is Percentage Calculator?

Free online percentage calculator to solve any percentage problem quickly.

Work out what percentage one number is of another, find the percentage increase or decrease between two values, or take a specific percentage of any number. Handy for everyday math like figuring a 20 percent tip, a 30 percent off discount, sales tax, a grade out of total marks, or a profit margin. The tool covers all the common percentage operations in one place with clear, step-by-step results so you can see the formula behind each answer. Runs entirely in your browser with no signup required, so your calculations stay private.

How to Use Percentage Calculator

1Select the type of percentage calculation you need (percentage of a number, percentage change, or what percent X is of Y)
2Enter the required values in the input fields
3View the calculated result along with the formula used
4Copy the result or clear the fields to perform another calculation

Frequently Asked Questions

How do I calculate the percentage of a number?

To find a percentage of a number, multiply the number by the percentage and divide by 100. For example, 25% of 200 is (200 x 25) / 100 = 50. This calculator handles the math for you - just enter the values and get instant results.

How do I calculate percentage change between two numbers?

Percentage change is calculated as ((New Value - Old Value) / Old Value) x 100. A positive result means an increase, and a negative result means a decrease. Enter your old and new values, and the tool computes the change instantly.

What is the difference between percentage and percentile?

A percentage is a fraction of 100 (e.g., 85% means 85 out of 100). A percentile indicates a value below which a given percentage of observations fall in a dataset (e.g., the 90th percentile means you scored higher than 90% of participants). This tool calculates percentages, not percentiles.

Is this calculator accurate for financial calculations?

Yes. The calculator uses precise arithmetic suitable for financial percentage calculations such as discounts, tax rates, profit margins, and interest rates. Results are displayed with full decimal precision.

How do I calculate a discount, like 30% off a price?

Use the percentage of a number mode: 30% of the price gives the discount amount, and subtracting it from the original gives the sale price. For example, 30% of 120 is 36, so the discounted price is 84. The tool shows both the amount off and the final figure.

How do I work out a tip from a bill?

Take the percentage of the bill total. A 20% tip on an 85 bill is 0.20 times 85, which is 17, making the total 102. Enter the bill as the number and the tip rate as the percentage to get the tip and grand total instantly.

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Percentage Formulas Reference

Calculation	Formula
X% of Y	(X / 100) x Y
X is what % of Y	(X / Y) x 100
X is Y% of what	X / (Y / 100)
% Change	((New - Old) / \|Old\|) x 100
% Difference	(\|A - B\| / ((A + B) / 2)) x 100
Increase by %	Value + (Value x %/100)
Decrease by %	Value - (Value x %/100)
Profit Margin	(Profit / Selling Price) x 100
Markup	(Profit / Cost Price) x 100