Percentage Calculator

What Is the Percentage Calculator?

The Percentage Calculator helps you solve everyday percentage problems without doing the arithmetic by hand. Use it to find a percentage of a number, work out what percentage one number is of another, or measure a percentage increase or decrease. It is useful for discounts, tips, taxes, grades, salary changes, and comparing numbers over time.

How to Use the Percentage Calculator

1. Choose the type of calculation you need: a percentage of a number, one number as a percentage of another, or percentage change.
2. Enter the numbers in the fields. You can use whole numbers and decimals, for example 250 and 20.
3. Click Calculate to see the result.
4. Read the result together with the calculation shown, so you can check how it was worked out.
5. Change any input to compare another scenario. The result updates when you calculate again.

Worked Example

Suppose a jacket costs $80 and is reduced by 25%. To find the discount: 25% of 80 = (25 / 100) x 80 = 20, so the discount is $20 and the sale price is $60. As a second example, if a price rises from $40 to $50, the increase is $10. Divide 10 by the original value 40 and multiply by 100 to get a 25% increase. As a third example, 30 as a percentage of 50 is (30 / 50) x 100 = 60%.

Limitations

• The result is only as accurate as the numbers you enter. Check your inputs if a result looks unexpected.
• Results are rounded for display. Very small differences can occur when you round intermediate steps yourself.
• This tool shows the arithmetic only. It does not give financial, tax, or legal advice.
• A percentage change from an original value of zero cannot be calculated, because division by zero has no defined result.

Frequently Asked Questions

How do I calculate X percent of Y?

Divide X by 100, then multiply by Y. For example, 20% of 250 is (20 / 100) x 250 = 50.

How do I calculate a percentage increase or decrease?

Subtract the original value from the new value, divide by the original value, and multiply by 100. A positive result is an increase and a negative result is a decrease. For example, from 40 to 50 is a 25% increase.

What percentage is one number of another?

Divide the first number by the second number and multiply by 100. For example, 30 as a percentage of 50 is (30 / 50) x 100 = 60%.

Can a percentage be more than 100%?

Yes. A percentage above 100% means the value is larger than the reference value. For example, 150 is 150% of 100, and growth from 100 to 250 is a 150% increase.