Percentage Calculator: Find Percentages Fast
Use this free percentage calculator to find a percent of a number, work out percentage change, increase or decrease a value, or find the original number.
What is X% of Y?
X is what percent of Y?
Percentage change from one value to another
Increase or decrease a number by a percentage
X is Y% of what number?
How to use this percentage calculator
- Pick the type of question you want answered from the tabs.
- Enter your two numbers. The result updates as you type.
- Read the answer and the working shown under it.
- Switch tabs to solve another type of percentage problem.
What is a percentage calculator?
A percentage calculator does the maths for questions like “what is 15% of 80?” or “how much did the price go up?”. It is useful for shopping, tips, grades, taxes, salary changes and business reports. For shopping specifically, try our discount calculator, or visit our home page for more free tools.
Percentage calculator formulas
A percentage is a number expressed as a fraction of 100. These are the formulas behind each tab, and you can find more practice on Math is Fun.
Percentage calculator examples
% of a number
15% of 80 is 15 ÷ 100 × 80 = 12.
What percent
30 is 20% of 150, because 30 ÷ 150 × 100 = 20.
Percentage change
A price rising from 80 to 100 is a 25% increase.
Quick tricks without a percentage calculator
10% of a number
Move the decimal point one place left. 10% of 250 is 25.
50% of a number
Divide by 2. 50% of 90 is 45.
25% of a number
Divide by 4. 25% of 200 is 50.
1% of a number
Divide by 100. 1% of 640 is 6.4.
Percentage calculator FAQ
How do you calculate a percentage?
Divide the part by the whole and multiply by 100. For example, 30 out of 150 is 30 ÷ 150 × 100 = 20%. The percentage calculator above does this for you.
How do you calculate a percentage increase or decrease?
Subtract the old value from the new value, divide by the old value and multiply by 100. A positive result is an increase and a negative result is a decrease. For example, going from 80 to 100 is a 25% increase.
How do I find a percent of a number?
Divide the percentage by 100 and multiply by the number. For example, 20% of 150 is 20 ÷ 100 × 150 = 30.
What is the difference between percentage change and percentage points?
Percentage change compares two values as a share of the starting value. Percentage points are the plain difference between two percentages, so going from 10% to 12% is 2 percentage points but a 20% increase.
This percentage calculator gives results for general information. Check important figures, such as prices, taxes or grades, before you rely on them.