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Percentage Calculator Pro

Calculate percentages in four different modes: X% of Y, X is what % of Y, percentage change, and percentage difference.

Result

15% of 200 = 30

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Why Use a Percentage Calculator?

Percentages are everywhere — discounts, taxes, tips, statistics, grades, and financial calculations. A percentage calculator saves time and eliminates mental math errors by computing exact values instantly.

Whether you're figuring out a sale price, calculating investment returns, or analyzing data, having a reliable percentage calculator with multiple modes (X% of Y, percentage change, difference) ensures you always get accurate results.

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Frequently Asked Questions

Use the first calculator mode. Enter the percentage (X) and the total value (Y), and we'll compute X% of Y instantly. For example, 15% of 200 = 30.
Use the 'Percentage Change' mode. Enter the original value and the new value. We'll calculate the increase or decrease as a percentage. For example, 50 to 75 is a 50% increase.
Use the 'X is what % of Y' mode. Enter X as the part and Y as the whole. The result shows X as a percentage of Y. For example, 30 is 15% of 200.
Yes, all calculations are performed with full JavaScript number precision. Results are rounded to 2 decimal places for readability, but the underlying calculation uses exact values.
No. All calculations happen locally in your browser. None of your numbers are sent to any server or stored anywhere.
Percentage change compares an old value to a new value ((new - old) / |old| × 100). Percentage difference compares two values symmetrically (|A - B| / ((A+B)/2) × 100) without a reference point.
Use the 'X% of Y' mode. Enter the tip/discount percentage as X and the bill/original price as Y. For example, 15% of $50 = $7.50 tip or discount.
Yes, use the 'Percentage Change' mode. Enter the original salary/investment value and the new value to see the percentage increase or decrease over time.