Free Online Percentage Calculator
A percentage calculator handles the three percentage questions you actually ask: what is X% of Y, what percentage is X of Y, and what is the percentage change from X to Y — each with the formula shown alongside the answer.
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How to Use This Calculator
- Pick the mode: "X% of Y", "X is what % of Y", or "% change from X to Y".
- Enter the two numbers.
- The answer updates live below the inputs along with the formula used.
- Adjust the decimal precision if needed.
What Is a Percentage Calculator?
The three modes cover almost every everyday percentage problem. "What is 15% of $84.50?" is the tip calculation. "What percentage is 23 of 80?" is a test-score calculation. "What is the percentage change from $1,200 to $980?" is a price-drop or stock-move calculation.
This calculator switches between the three modes with a tab, shows the formula it used (e.g. `15 ÷ 100 × 84.50 = 12.675`), and rounds to a configurable number of decimal places. Useful for double-checking quick math in a meeting or homework.
Frequently Asked Questions
How do I calculate percentage of a number?
What is percentage change?
Can I use this calculator for discounts?
Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.
Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.