Percentage Calculator

Numbers

Three modes: X% of Y, X is what % of Y, percentage change from X to Y. Instant results.

What is X% of Y?

% of=Enter values

X is what % of Y?

is what % of=Enter values

Percentage change from X to Y

Fromto=Enter values

Works great for

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Discount Price Checks

Calculate the final price after a 20% or 30% sale in seconds. Shoppers use this to compare discount deals and verify promotional pricing at checkout.

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Finance & Growth Analysis

Compute percentage change between two revenue figures, stock prices, or KPI values. Instantly see whether a metric grew or declined and by how much.

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Student Percentage Problems

Solve common exam questions like 'X is what percent of Y?' or find a percentage of a number. Perfect for maths homework, standardised tests, and quick revision.

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Marketing Conversion Lifts

Measure the percentage lift in click-through rate, conversion rate, or open rate between two campaign variants. Quantify A/B test results without a spreadsheet.

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Tax & VAT Calculations

Work out VAT, sales tax, or service charge amounts by entering the rate and the base price. Accountants and business owners use this for quick invoice checks.

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Grade & Score Calculation

Teachers can compute what percentage a student scored out of the total marks available. Convert raw test scores to percentage grades instantly and copy the result.

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Frequently asked questions

How do I calculate what percentage one number is of another?

Switch to the 'X is what % of Y' mode, enter both numbers, and the percentage is calculated instantly. The tool also offers a mode for finding X% of Y and a mode for percentage change between two values.

How do I calculate a percentage increase or decrease?

Use the percentage change mode, enter the original value and the new value, and the tool returns the percent increase or decrease between them, showing a negative result for decreases.

Is this percentage calculator accurate for tax or discount math?

Yes, the underlying math is standard percentage arithmetic, so it works correctly for discount calculations, tax additions, tip amounts, or grade percentages as long as you pick the matching mode for your calculation.

Can I calculate a percentage without knowing the formula?

Yes, you just pick one of the three modes (percent of a number, what percent one is of another, or percent change) and enter your two values. The tool applies the correct formula automatically.

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