Utility

Percentage Calculator

Solve percentage-of, reverse percentage, and percentage change problems instantly with this free online percentage calculator.

Percentage Calculator

Choose a calculation type and enter your values.

Percent Of

Enter the required values to calculate instantly.

Percentage (%)

Total Value

Ready to calculate

Enter your values and click calculate to see the result with a clean breakdown.

What is a Percentage Calculator?

A percentage calculator helps you solve common percent problems such as finding X% of Y, what percentage one number is of another, reverse percentages, and percentage increase or decrease.

Percentage Formulas

X% of Y

(X ÷ 100) × Y

X is what % of Y

(X ÷ Y) × 100

X is Y% of what

X ÷ (Y ÷ 100)

Percentage Change

((New − Old) ÷ Old) × 100

Percentage Examples

20% of 150

Input: X = 20, Y = 150

Result: 30

30 is what percent of 150

Input: X = 30, Y = 150

Result: 20%

30 is 20% of what

Input: X = 30, Y = 20%

Result: 150

100 to 120

Input: Old = 100, New = 120

Result: 20% increase

Percentage vs Percentage Point

A percentage point is the arithmetic difference between two percentages. If a rate rises from 5% to 7%, that is a 2 percentage point increase, but a 40% relative increase.

Frequently Asked Questions

To calculate percentage, divide the part by the whole and multiply by 100. To find a percentage of a number, multiply the number by the percentage as a decimal.

Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result is an increase and a negative result is a decrease.

Divide the first number by the second number and multiply by 100. For example, 25 is what percent of 200 = (25 ÷ 200) × 100 = 12.5%.

In Excel, use =A1/B1*100 or divide one number by another and format the cell as a percentage.