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math / Free Online Tool

Percentage Calculator.

Solve common percentage calculations: increases/decreases, fraction equivalents, and ratios.

Input Parameters

Comments & Feedback.

Documentation

User manual & function guide.

Detailed manual explaining every function, input parameter, and operational example for the Percentage Calculator.

What is X% of Y?

Function

Calculates specified percentage of a number.

Example Operation 25% of 200 = 50

X is what % of Y?

Function

Determines what percentage X represents of Y.

Example Operation 25 is what % of 200 = 12.5%

Percentage Change X to Y

Function

Calculates percentage increase or decrease.

Example Operation Change from 25 to 200 = 700% increase

Frequently asked questions.

How do I calculate percentage change?

Percentage change = ((New Value - Old Value) / Old Value) × 100. A positive result means an increase, negative means a decrease.

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