Percentage Calculator
Three ways to calculate percentages — find what percent of a number, find what percentage one number is of another, or calculate percentage change.
What is X% of Y?
e.g. "What is 15% of 200?"
X is what % of Y?
e.g. "30 is what % of 200?"
Percentage Change
e.g. "From 80 to 100 = 25% increase"
Percentage Formulas
X% of Y = Y × (X / 100)
Find a percentage of a number
% = (Part / Whole) × 100
Find what percent X is of Y
% Change = ((New − Old) / |Old|) × 100
Percentage increase or decrease
Frequently Asked Questions
To find 20% of any number, multiply it by 0.20. For example, 20% of 150 = 150 × 0.20 = 30. Or use our calculator above in the first box.
Percentage change is relative (e.g., from 4% to 5% is a 25% increase). A percentage point change is absolute (4% to 5% = 1 percentage point change). These two measures tell very different stories!
To add X% to a number N, calculate N × (1 + X/100). For example, adding 10% to 200 = 200 × 1.10 = 220. This is also used for sales tax calculations.