%
What is X% of Y?
Result
30
20% of 150 is 30.
Quick reference
% of a number
value × percent ÷ 100
X is what % of Y
X ÷ Y × 100
% change
(new − old) ÷ old × 100
Increase / decrease
value × (1 ± percent ÷ 100)
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GuideCalculate a percentage in three steps3 steps
01
Pick a mode
Choose the kind of percentage question you need to answer using the tabs.
02
Enter values
Type the two numbers. The result updates instantly as you type.
03
Copy the answer
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FAQPercentage calculator questions
How do I find the percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30. Use the "% of a number" mode.
How is percentage change calculated?
Percentage change is (new − original) ÷ original × 100. A positive result is an increase and a negative result is a decrease.
What does "X is what percent of Y" mean?
It answers what portion X represents of Y, calculated as X ÷ Y × 100. For example, 30 is 20% of 150.
Does the calculator store my numbers?
No. Everything is computed in your browser as you type. Nothing is sent to a server or saved.