CalcHub
Percentage Calculator
Percent of a number, ratios, and percentage change.
Mode 1: X% of Y = (X ÷ 100) × Y · Mode 2: X is (X ÷ Y) × 100% of Y · Mode 3: change = (Y − X) ÷ X × 100%
- How do I calculate a discount?
- A 20% discount on a price Y is 20% of Y, i.e. price × 0.80. Use the first mode with X = 20 and Y = the original price.
- What does a negative percentage change mean?
- It means the value decreased. The change is (new − old) ÷ old × 100; a negative result is a decrease, a positive one an increase.
- What does "X is what percent of Y" tell me?
- It expresses X as a share of Y: divide X by Y and multiply by 100. For example, 30 is 15% of 200.
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