A practical example
What is 15% of 80?
Choose the percentage-of question, enter 15 and 80, and the calculator returns 12.
Percentage Calculator
Choose the percentage question you need to answer.
Your work stays in this browser.
YOUR QUESTIONWhat is X% of Y?
20% of 80 is16(20 ÷ 100) × 80
How to use the Percentage Calculator
Percentage Calculator handles several common percentage questions in one place. Choose the question that matches your situation, enter both values, and see the result with the formula used to produce it.
Choose the question
Select percentage of, what percent, percentage change, increase or decrease, or percentage difference.
Enter both values
Use the field labels and example wording to place each number correctly.
Read the answer and formula
The result updates automatically and shows the calculation beneath it.
What to know
- Percentage change compares an old value with a new value; percentage difference treats both values equally.
- Results may be rounded for display when a decimal continues.
Questions people ask
How do I calculate a discount?
Use Increase or decrease, enter the original price and discount percentage, then choose Decrease.
Why can’t the comparison value be zero?
A percentage comparison divides by a reference value, and division by zero has no finite result.