Percentage Calculator
Calculate percentages and percentage changes
What is X% of Y?
Find a percentage of a number
%
X is what percent of Y?
Find what percentage one number is of another
Percentage Change/Difference
Calculate increase or decrease percentage
Common Percentages
Quick reference guide
10%
= 0.10 = 1/10
12.5%
= 0.125 = 1/8
20%
= 0.20 = 1/5
25%
= 0.25 = 1/4
33.33%
= 0.333 = 1/3
50%
= 0.50 = 1/2
66.67%
= 0.667 = 2/3
75%
= 0.75 = 3/4
100%
= 1.00 = 1/1
Percentage Formulas
Finding a Percentage
Formula: (Percentage ÷ 100) × Value
Example: 20% of 100 = (20 ÷ 100) × 100 = 20
Finding What Percent
Formula: (Value ÷ Total) × 100
Example: 25 is what % of 100? = (25 ÷ 100) × 100 = 25%
Percentage Change
Formula: ((New - Old) ÷ Old) × 100
Example: From 50 to 75 = ((75 - 50) ÷ 50) × 100 = 50% increase