Percentage Calculator

WebToola

Find a percentage of a number, or one number as a percentage of another.

About the Percentage Calculator

The Percentage Calculator makes it easy to perform common percentage calculations. You can find a percentage of a number or calculate what percentage one number represents of another.

Choose the calculation you need, enter the two values, and get the result instantly. This can be useful for everyday calculations involving prices, budgets, statistics, grades, business figures and more.

How to Calculate a Percentage of a Number

To find a percentage of a number, choose “What is A% of B?”, then enter the percentage as A and the number as B.

For example:

A: 20
B: 150

The calculation is:

20% of 150 = 30

So the result is:

30

The formula is:

Result = (A ÷ 100) × B

Using the example above:

(20 ÷ 100) × 150 = 30

This calculation is useful whenever you need to find a specific percentage of a value.

How to Find What Percentage One Number Is of Another

To find what percentage one number represents of another, choose “A is what percentage of B?”

For example:

A: 20
B: 150

The calculation is:

20 ÷ 150 × 100 = 13.3333333333%

So:

20 is approximately 13.33% of 150.

The formula is:

Percentage = (A ÷ B) × 100

This type of calculation is useful when comparing a part with a total—for example, determining what percentage of a budget has been spent, what percentage of a total belongs to a particular category, or what percentage of questions were answered correctly.

Understanding Percentages

A percentage expresses a number as a fraction of 100. The word “percent” essentially means “per hundred,” which is why 100% represents the whole amount.

For example:

50% means 50 out of 100, or one-half.
25% means 25 out of 100, or one-quarter.
10% means 10 out of 100, or one-tenth.

So, if you want to find 25% of 200, you can convert 25% to 0.25 and multiply:

0.25 × 200 = 50

Percentages make it easier to compare values even when the original totals are different.

Common Uses for Percentage Calculations

Percentage calculations are useful in many everyday situations, including shopping, budgeting, finance, education, statistics and business.

You might use a percentage calculator to find a portion of an amount, determine how much of a total has been used, calculate a score as a percentage, or compare one quantity with a larger total.

If you need to calculate how much a value has increased or decreased between two numbers, use WebToola’s Percentage Change Calculator instead. For sale prices and savings, the Discount Calculator provides a more direct calculation.

Frequently Asked Questions

How do I calculate a percentage of a number?

Divide the percentage by 100 and multiply it by the number. For example, 20% of 150 is calculated as (20 ÷ 100) × 150, which equals 30.

How do I find what percentage one number is of another?

Divide the first number by the second number and multiply the result by 100. For example, (20 ÷ 150) × 100 gives approximately 13.33%.

What is 20% of 150?

20% of 150 is 30. You can calculate it by multiplying 150 by 0.20.

20 is what percentage of 150?

20 is approximately 13.33% of 150. Divide 20 by 150 and multiply by 100 to get the percentage.

What is the difference between percentage and percentage change?

A percentage can describe a portion of a number or the relationship between two values. Percentage change specifically measures how much a value has increased or decreased relative to its original value. WebToola’s Percentage Change Calculator is designed for that calculation.

Does WebToola store the numbers I enter?

No. The Percentage Calculator runs in your browser and does not send or save the values you enter.