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How this calculator works
X% of Y = X × Y ÷ 100. X is what % of Y = X ÷ Y × 100. % change from X to Y = (Y − X) ÷ X × 100, where a negative result means a decrease.
Frequently asked questions
How do I calculate a discount?
Use 'X% of Y' to find the discount amount, then subtract it from the price.
What does a negative percent change mean?
The value went down. For example, from 200 to 150 is −25%.