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Percentage Calculator

Calculate any percentage problem — fast and accurately.

🧮 Calculate Percentages

📌 What is X% of Y?

What is % of ?

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📌 X is what % of Y?

is what % of ?

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📌 Percentage Change (Increase / Decrease)

From to

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Percentage Calculator — Free, Instant & Versatile

Our Percentage Calculator handles every type of percentage calculation — find what percentage one number is of another, calculate percentage increases and decreases, work out the original value before a percentage change, and more. Completely free with no account required.

Percentage calculations appear everywhere in daily life: discounts, tax rates, tip calculations, grade conversions, profit margins, and data analysis. Having a reliable, instant percentage calculator saves time and eliminates calculation errors.

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Types of Percentage Calculations Supported

% of a number: What is X% of Y? (e.g., What is 15% of 200?)
What percentage: X is what % of Y? (e.g., 30 is what % of 150?)
Percentage change: What is the % increase or decrease from X to Y?
Add percentage: What is Y increased by X%? (e.g., 200 + 15%)
Subtract percentage: What is Y reduced by X%? (e.g., 200 − 20%)
Reverse percentage: Y is X% of what number?

How to Calculate Percentages — Step by Step

Choose calculation type: Select the type of percentage calculation you need.
Enter values: Input the numbers into the relevant fields.
Calculate: Click "Calculate" or press Enter — the result appears instantly.
Read the formula: The formula used is shown so you understand the calculation.
Try another type: Switch to a different calculation type for a different percentage problem.

❓ Frequently Asked Questions

How do I calculate 20% of a number?

Multiply the number by 0.20. For example, 20% of 350 = 350 × 0.20 = 70. The tool does this instantly.

How is percentage change calculated?

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

What is a reverse percentage?

A reverse percentage finds the original value before a percentage was applied. For example, if a price after 20% discount is £80, the original price was £80 ÷ 0.80 = £100.

Can I calculate sales tax or VAT?

Yes — use the 'add percentage' calculator. Enter the price and the tax rate (e.g., 20% for UK VAT) to see the total price including tax.

Is this tool free?

Yes, 100% free with no account required.

Can I calculate percentage for negative numbers?

Yes — the tool handles negative numbers for percentage change and other calculations.

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