Percentage Calculator

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Calculate percentages instantly: X% of Y, percentage change, and what percent A is of B. Free online percentage calculator for shopping, finance and math.

What is X% of Y?

% of

Percentage change (from A to B)

→

+50%

A is what % of B?

is what % of

25%

Try Full Percentage Calculator →

What is a percentage calculator?

A percentage calculator solves three everyday problems: finding X% of Y (e.g., 20% of €150), computing percentage change (e.g., price went from €50 to €75 — that is +50%), and expressing one number as a percent of another (e.g., 30 is 25% of 120).

These calculations show up constantly in shopping discounts, salary raises, investment returns, grades, and business reports. This tool does all three instantly.

Percentage basics

"Percent" means "per hundred". 20% of 150 = 150 × 20 ÷ 100 = 30. Percentage change = (B − A) ÷ A × 100. If the result is positive it is an increase; negative is a decrease.

No more mental math or spreadsheet formulas — type the numbers and read the answer.

How to Use

Choose the calculation you need (X% of Y, change, or ratio)
Enter your numbers — results update live
Read the answer with sign (+/-) for changes
Use it for shopping, finance, or homework

Features

⚡ Three-in-One% of, % change, and A-as-% of B.

🎯 Live ResultsUpdates as you type.

🧮 AccurateHandles decimals and negatives.

🆓 FreeUnlimited use, no signup.

Frequently Asked Questions

How do I calculate 20% of 150?

150 × 20 ÷ 100 = 30. Enter 20 and 150 in the first section to see it instantly.

How do I calculate percentage increase?

Percentage change = (new − old) ÷ old × 100. From 50 to 75: (75−50) ÷ 50 × 100 = +50%.

Is this percentage calculator free?

Yes — free, unlimited, no signup or ads.