Percentage Calculator

Instantly calculate percentages — find a percent of a number, work out percentage change, or find what percentage one number is of another. No sign-up needed.

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Choose a calculation type

What is X% of Y?

e.g. What is 20% of 150?

Your result will appear here

Choose a type, fill in the values, then hit Calculate.

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Reference

How Each Formula Works

Quick reference for the four percentage calculation types

% of Number
Result = (P ÷ 100) × N

Multiply the number by the percentage and divide by 100. E.g. 20% of 150 = (20 ÷ 100) × 150 = 30.

X is what % of Y
Result = (X ÷ Y) × 100

Divide the part by the whole and multiply by 100. E.g. 30 is what % of 120? = (30 ÷ 120) × 100 = 25%.

% Change
Result = ((New − Old) ÷ Old) × 100

Positive = increase, negative = decrease. E.g. from 80 to 100 = ((100 − 80) ÷ 80) × 100 = +25%.

Increase / Decrease
Result = N × (1 ± P ÷ 100)

Multiply the original by (1 + P/100) to increase, or (1 − P/100) to decrease. E.g. 200 + 15% = 200 × 1.15 = 230.

All calculations run in your browser. No data is sent to any server — everything stays private on your device.

FAQ

Common Questions

How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 15% of 200 = (15 ÷ 100) × 200 = 30. Use the "% of Number" mode above to do this instantly.
What is percentage change and how is it calculated?
Percentage change measures how much a value has grown or shrunk relative to its original amount. The formula is: ((New Value − Old Value) ÷ Old Value) × 100. A positive result means an increase; a negative result means a decrease.
What is the difference between percentage increase and percentage change?
They use the same formula. "Percentage change" is the general term — it can be positive (increase) or negative (decrease). The "Increase / Decrease" mode is useful when you already know the direction and want to find the final value after applying a percentage.
Is my data saved or shared?
No. All calculations run entirely in your browser using JavaScript. Nothing is sent to a server or stored in localStorage — your inputs disappear the moment you close the tab.
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