Finance

Percentage calculator

Calculate percentages, percentage change, and what percent one number is of another.

What is X% of Y?

% of = —

X is what % of Y?

is — % of

Percentage change from X to Y

→ = —

100% private. All processing happens locally in your browser — no files or data are ever sent to a server.

How to use Percentage calculator

01 Fill in the required values using the fields provided
02 Results calculate automatically as you type
03 Copy or note the result — all calculations stay on your device

Frequently asked questions

Common questions about Percentage calculator.

Is Percentage calculator free to use?

Yes, Percentage calculator is completely free. No account, subscription, or payment is ever required — just open the page and start using it.

Does Percentage calculator upload my data to a server?

No. Percentage calculator runs entirely in your web browser using client-side JavaScript. Your files, text, and data never leave your device, making it 100% private.

Can I use Percentage calculator on my phone or tablet?

Yes. Percentage calculator is fully responsive and works on all modern smartphones, tablets, and desktop browsers without installing any app.

Are these results accurate enough to rely on?

Percentage calculator uses well-established formulas and provides accurate estimates for everyday use. For financial, medical, or legal decisions, always consult a qualified professional.

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About Percentage calculator

The Percentage Calculator solves the three most frequently needed percentage calculations in a single interface: what is X% of Y, X is what percent of Y, and what is the percentage change from X to Y. Percentages appear in virtually every area of everyday numeracy — retail discounts, tax rates, interest calculations, exam scores, survey statistics, and financial reporting. All three modes produce instant results, making it useful for quick mental maths checks as much as more formal calculations.