Percentage Calculator

Calculate percentages instantly. Find a percentage of a number, compare values, or calculate the original value from a percentage.

Choose calculation type

Select the percentage problem you want to solve and enter your values.

Percentage

Enter the percentage you want to calculate.

Of number

Enter the number you want to find the percentage of.

This calculator runs locally in your browser. No values are uploaded or stored.

Percentage result

Enter your values to calculate the result.

Formula:
Percentage ÷ 100 × Number

Tip: Percentages are used everywhere — shopping discounts, statistics, taxes, grades, business growth and financial analysis.

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Instant results Calculate percentage problems in real time.

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Multiple modes Solve several types of percentage calculations.

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Everyday useful Helpful for school, shopping, finance and business.

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Private Everything runs locally in your browser.

Quick percentage examples

20% of 150 = 30

25 is 12.5% of 200

30 is 15% of 200

50% means one half

Percent = per hundred

What is X% of Y?

Use this mode to calculate a percentage of a number. This is useful for discounts, taxes, tips and commissions.

Percentage ÷ 100 × Number

X is what percent of Y?

Compare one value to another to find the percentage relationship between them.

Value ÷ Total × 100

Find the original value

Use this mode when you know a percentage value and want to calculate the original number.

Known value ÷ (Percentage ÷ 100)

Common percentage calculation mistakes

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Forgetting to divide by 100

A percentage must first be converted into a decimal. For example, 20% becomes 0.20.

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Mixing up total and part values

Make sure you know which number is the full amount and which number is the partial value.

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Using the wrong formula

Different percentage questions require different formulas. Choose the correct calculator mode first.

Free online percentage calculator

This percentage calculator helps you solve common percentage problems quickly and accurately. You can calculate percentages of numbers, compare values, and find original values from percentages.

Percentages are commonly used in shopping, statistics, business, taxes, finance, grades, investments and everyday math.

How percentages work

The word percentage means “per hundred.” For example, 25% means 25 out of 100. To calculate percentages manually, you usually divide by 100 and then multiply.

When should you use a percentage calculator?

A percentage calculator is useful when you need quick and accurate results without manually applying formulas. It can save time and reduce calculation mistakes.

Percentage Calculator FAQ

How do you calculate a percentage of a number?

Divide the percentage by 100 and multiply by the number. For example, 20% of 150 is 30.

How do you find what percentage one number is of another?

Divide the first number by the second number and multiply by 100.

What does percent mean?

Percent means “per hundred.” So 50% means 50 out of 100.

Can this calculator find the original value?

Yes. Use the original value mode to calculate the starting number from a percentage result.

Is this calculator free?

Yes. It is completely free and works directly in your browser.

Are my values stored?

No. All calculations happen locally in your browser and values are not stored.