What is a percentage?

A percentage is a number expressed as a fraction of 100. "50%" means 50 out of every 100, or half of a whole.

How do I calculate percentage increase?

Use the "% Change" tab. Enter the original value and new value — the tool calculates the percentage increase or decrease automatically.

Use the "% of Total" tab. Enter X and Y to find out what percentage X represents of Y.

Use the "Add/Remove %" tab. Enter the base number and percentage to get both the increased and decreased values.

Calculator

Calculate percentages, discounts, tips, and percentage change.

Percentage Calculator

Percentage (X%)

Number (Y)

Percentage — Wikipedia

Mathematical definition and history of percentages

Percentage Change — Wikipedia

How to calculate percentage increase and decrease

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