What is X% of Y?
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Free Percentage Calculator
Calculate percentages instantly — find percentages of numbers, percentage changes, tips, and more.
X is what % of Y?
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Percentage change from X to Y
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Percentage increase / decrease
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Tip Calculator
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Per person
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Frequently Asked Questions
How do I calculate a percentage?
Divide the percentage by 100, then multiply by the number. For example, 15% of 200 is 0.15 × 200 = 30.
How do I find what percentage one number is of another?
Divide the first number by the second number, then multiply by 100. Example: 30 ÷ 200 × 100 = 15%.
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the absolute original value, and multiply by 100. Going from 80 to 100 is a 25% increase.
How does the tip calculator work?
The tip calculator multiplies the bill amount by the selected tip percentage, adds the tip to the bill total, and can split the total evenly between multiple people.
Is this calculator accurate?
Yes. It performs all calculations in your browser and rounds the displayed result cleanly to avoid floating-point display noise.
Does this percentage calculator store any data?
No. Everything runs locally in your browser. No values are uploaded, tracked, or stored on a server.