Tool Percentage Calculator
Calculate percentages, increase, decrease and percentage change
Percentage Calculation Formulas
1. What is X% of Y?
Result = (X ÷ 100) × Y
Example: What is 15% of 20? = (15 ÷ 100) × 20 = 3
2. X is what % of Y?
Result = (X ÷ Y) × 100
Example: 5 is what % of 20? = (5 ÷ 20) × 100 = 25%
3. Percentage change
Change = ((New Value - Old Value) ÷ Old Value) × 100
Example: From 100 to 120 = ((120 - 100) ÷ 100) × 100 = 20% increase
4. Percentage increase
Result = Number + (Percentage × Number ÷ 100)
Example: 100 increased by 20% = 100 + (20 × 100 ÷ 100) = 120
5. Percentage decrease
Result = Number - (Percentage × Number ÷ 100)
Example: 100 decreased by 20% = 100 - (20 × 100 ÷ 100) = 80