Percentage Calculator

Calculate percentages easily

What is X% of Y?

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X is what % of Y?

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Percentage change from X to Y

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About Percentage Calculator

Percentage Calculator offers three independent instant calculations — what X% of Y is, what percent X is of Y, and the percentage change from X to Y — all computed live as you type, entirely in your browser. Each panel has its own pair of number fields, so entering values in one doesn't affect the others.

How to use Percentage Calculator

1Scroll to the panel for the calculation you need: "What is X% of Y?", "X is what % of Y?", or "Percentage change from X to Y".
2Enter your two numbers in that panel's input fields.
3The result appears instantly below the inputs — no calculate button needed.
4Each panel keeps its own values, so you can fill in more than one calculation at a time.

Frequently Asked Questions

Do the three panels work independently?

Yes — each panel has its own two input fields, so entering values in one doesn't change or clear the others.

Is Percentage Calculator free to use?

Yes, it's completely free with no signup required.

How accurate are the results?

Results use standard floating-point math and are shown to 2 decimal places.

What calculations are available?

Percentage of a number, what percent one number is of another, and percentage change between two numbers.

Tips & Tricks

✓Since each panel is independent, you can keep values filled in across all three at once for quick comparisons.
✓For percentage change, a negative result means a decrease and a positive result means an increase.
✓Use "X is what % of Y?" to quickly figure out grades, discounts, or completion rates.
✓Round results manually for money calculations to avoid odd fractional cents.