Question 1

How do I calculate what percent X is of Y?

Accepted Answer

Select the 'X is what % of Y?' mode, enter X and Y, then click Calculate. The formula is: percentage = (X / Y) × 100.

Question 2

How do I calculate X% of a number?

Accepted Answer

Select 'What is X% of Y?', enter the percentage and the number, then click Calculate. The formula is: result = (X / 100) × Y.

Question 3

How do I calculate percentage change?

Accepted Answer

Select 'Change from X to Y', enter the original value and the new value. The formula is: change = ((new − original) / |original|) × 100. A positive result is an increase; negative is a decrease.

Question 4

How do I calculate a discount percentage?

Accepted Answer

To find the sale price after a discount, use 'What is X% of Y?' where X is the discount percentage and Y is the original price. Subtract the result from the original price.

Percentage Calculator