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Percentage Calculator

Calculate percentages in three modes: what is X% of Y, X is what % of Y, and percentage change between two values

How to Use the Percentage Calculator

1

Choose Calculation Type

Select the mode that matches your calculation from the three available options.

2

Enter the Values

Type the required numbers into both input fields.

3

Click Calculate

Your result appears instantly along with a step-by-step calculation breakdown.

4

Share the Result

Copy or share your result via WhatsApp or X with one click.

Frequently Asked Questions

Divide the part by the total and multiply by 100. For example: 30 out of 120 = (30 ÷ 120) × 100 = 25%.
Subtract the original from the new value, divide by the original, then multiply by 100. A positive result is an increase; negative is a decrease.
20% of 500 = 500 × 20 ÷ 100 = 100.
Use Mode 1: enter the discount percentage and the original price. The result is the discount amount.
Yes, the percentage calculator is completely free and runs in your browser with no signup required.

Formulas: (1) Part of whole % = part ÷ whole × 100. (2) Percentage of a number = number × % ÷ 100. (3) Percentage change = (new − old) ÷ old × 100. Standard arithmetic computed locally in your browser.

About This Calculator

Percentages are a fundamental part of everyday life — from discounts and taxes to tracking progress and price changes. This calculator covers all three common scenarios in one place. You can also try the VAT Calculator to calculate tax amounts for Gulf countries.

Percentage change is used to measure the difference between two values: a stock price before and after, last year's salary compared to today, or sales figures from two consecutive seasons. A positive result means an increase; a negative result means a decrease.

The three formulas behind the calculator are simple enough to apply by hand. To find what percentage one number is of another: divide the first by the second and multiply by 100 — 30 out of 200 is 15%. To find a percentage of an amount: divide the percentage by 100 and multiply by the amount — 15% of 200 is 30. For percentage change: subtract the old value from the new one, divide by the old value, then multiply by 100.

Watch out for a common mistake: a 50% increase followed by a 50% decrease does not return you to the original number. Raise 100 by 50% and you get 150; cut 150 by 50% and you get 75, not 100 — because each percentage is taken from a different base. It is the same reason a 20% discount after a 20% increase leaves the price below the original rather than level with it.