How do I calculate a percentage?

To find what X% of Y is, divide X by 100 and multiply by Y. For example: 20% of 150 = (20/100) × 150 = 30.

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

Divide the first number by the second number, then multiply by 100. For example: 30 is what % of 150? = (30/150) × 100 = 20%.

How do I calculate percentage increase or decrease?

Subtract the old value from the new value, divide by the old value, and multiply by 100. Positive = increase, negative = decrease.

What are some real-world uses for percentage calculations?

Percentages are used everywhere: calculating tips, sales discounts, tax rates, grade scores, loan interest, investment returns, population changes, and business growth metrics.

Yes! The Toolzilla Percentage Calculator is 100% free with no limits. All calculations happen in your browser for complete privacy.

Percentage Calculator

Calculate percentages and percentage changes

Percentage Calculator

Calculate percentages, percentage changes, and solve percentage problems instantly

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Percentage Change

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What is X% of Y?

X is what % of Y?

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Frequently Asked Questions

How do I calculate a percentage?

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

How do I calculate percentage increase or decrease?

What are some real-world uses for percentage calculations?

Is this tool free?

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