Percentage Calculator
Percentage result = Percentage × Number ÷ 10020 × 200 ÷ 100 = 40
Free online tool
Percentage Calculator
Answer the two most common percentage questions instantly, with the formula shown beside your result.
Instant calculation
What is X% of Y?
Find a percentage of any number.
Instant calculation
X is what percent of Y?
Express one value as a percentage of another.
Instant calculation
X is Y% of what number?
Find the total when you know a value and its percentage.
Your result
Calculation
Your numbers stay in this browser. Nothing is uploaded or saved.
Three clear steps
How to use this calculator
- 01
Choose a mode
Select whether you want a percentage of a number or one value as a percentage of another.
- 02
Enter the known values
Type the percentage and number, or the value and total, in the labeled fields.
- 03
Calculate the result
Select Calculate to see the answer, formula and explanation.
- 04
Find the original total
Use the reverse-percent mode to find the total when you know a value and what percentage it represents.
The formula
How this calculation works
Divide the percentage by 100, then multiply by the number. To find what percent one value is of another, divide the value by the total and multiply by 100. To find the total when you know a value and its percentage, divide the value by the percentage and multiply by 100.
Check the method
Worked examples
Each example follows the same formula used by the calculator.
What is 20% of 200?
20 × 200 ÷ 100 = 404025 is what percent of 200?
25 ÷ 200 × 100 = 12.5%12.5%25 is 20% of what number?
25 ÷ 20 × 100 = 125125Common questions
Questions about this calculation
How do you calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 200 is 20 × 200 ÷ 100 = 40.
What is 20% of 100?
20% of 100 is 20 because 20 × 100 ÷ 100 equals 20.
How do you find what percent one value is of another?
Divide the value by the total and multiply by 100. A total of zero cannot be used because division by zero is undefined.
Can the percentage calculator use decimals?
Yes. You can enter decimal percentages and decimal values, including values such as 12.5%.
Are my percentage inputs private?
Yes. The calculation happens in your browser and your inputs are not sent to Flux Calculator.
Continue calculating