Percentage Calculator

All-in-one multi-mode percentage calculator. Find what X% of Y is, calculate percentage increase or decrease, find percentage changes, and calculate sale discounts.

How to use Percentage Calculator

1Choose your calculation mode from the tabs (What is X% of Y, Percentage Increase/Decrease, X is what % of Y).
2Enter your values in the input fields.
3See the instant result and the exact mathematical formula used.

Key Features & Capabilities

4 distinct percentage modes

Step-by-step formula explanation for every result

Instant live recalculation

Handles decimal numbers and negative changes

Frequently Asked Questions

How do you calculate percentage increase?

Subtract the old value from the new value, divide by the absolute old value, and multiply by 100: `((New - Old) / Old) * 100`.

Privacy & Security Commitment

Computed entirely on your device.

Related In-Depth Guides

How to Calculate Percentage Change, Increases, and Discounts

Learn the exact mathematical formulas for percentage increase, percentage decrease, proportion calculations, and sales discount margins.

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