Percentage Calculator

Six practical percentage calculators with clear results.

What is X% of Y?

Percentage (X)Value (Y)—

X is what % of Y?

Part (X)Total (Y)—

Percentage increase

Original valueNew value—

Percentage decrease

Original valueNew value—

Original value

Known partPercentage—

Discount

Original priceDiscount percentage—

Working with percentages

A percentage expresses a part per hundred. The tool can find a percentage of a value, identify what percentage one value is of another, and calculate percentage increase or decrease.

Percentage change uses the original value as its base. If the original value is zero, a normal percentage change is undefined, so use the displayed validation rather than treating it as zero.

Helpful questions

What is 20% of 150?

Multiply 150 by 0.20 to get 30.

How is percentage increase calculated?

Subtract the original value, divide by the original, then multiply by 100.

Why is change from zero undefined?

A percentage change requires division by the original value, and division by zero is not defined.