Percentage Calculator
Find X% of a number, what percent one number is of another, and percentage change.
Runs in your browser
What is X% of Y?
Answer
450
18% × 2500 ÷ 100
X is what percent of Y?
Answer
25%
450 ÷ 1800 × 100
Percentage increase or decrease
Increase
25%
(New − Old) ÷ Old × 100
How to use Percentage Calculator
1
Pick the question you want answered.
2
Enter the numbers.
3
Read the answer and formula.
Frequently asked questions
How is percentage change calculated?
(New − Old) ÷ Old × 100. A positive result is an increase; negative is a decrease.
About this calculator
Three everyday percentage questions answered instantly, with the formula shown so you can check the math.
Percentage Calculator runs entirely in your web browser. Your data are processed on your own device and are never uploaded to our servers, which makes it safe for personal and business files.