Percentage Calculator

Find the Value

of % is how much
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Percentage Change

From to what is the percentage change?
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Proportion Analysis

is what percent of
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Reverse Calculation

is % of what?
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Percentage Calculator — Percent Value, Change, and Ratio

Percentage Calculator handles the four most common percentage operations: what is X% of Y, what percent X is of Y, percentage change between two values, and part-of-total ratio. Enter any two known values and get the missing one instantly.

Features & Usage Tips

Solve X% of Y, X as a percent of Y, percentage change, and part-of-total ratio — all four modes in one tool, instantly.

Percentage Operations Explained

Each of the four modes solves a different problem, and all accept any two known values to compute the unknown one. Switch modes to match exactly what you need.
  • Percent of Value: What is X% of Y? — e.g. 15% of 200 = 30.
  • Value as Percent: X is what percent of Y? — e.g. 30 is 15% of 200.
  • Percent Change: The increase or decrease from A to B as a percentage — e.g. 80 → 100 is +25%.
  • Part of Total: What percentage of a total does a part represent?

Use Cases

🛍️ Shopping Discounts: Calculate the final price after a 20% off sale, or the effective discount percentage.

📊 Business Reporting: Express growth, market share, or completion rates as percentages.

🧮 Grade & Score: Convert raw scores into percentages for exams or project evaluation.

💱 Price & Tax: Compute tax amounts, tips, or profit margins on the fly.

Privacy & Security

This tool runs entirely in your browser. All percentage calculations are performed locally on your device — no data is transmitted anywhere.