Question 1

How do I calculate a percentage of a number?

Accepted Answer

To find a percentage of a number, divide the percentage by 100 and multiply it by the number. For example, to find 20% of 150, calculate (20 ÷ 100) × 150 = 30. Use the "What is X% of Y?" tab above to get this result instantly.

Question 2

How do I calculate percentage increase or decrease?

Accepted Answer

Percentage change is calculated by subtracting the original value from the new value, dividing by the original value, then multiplying by 100. For example, going from 100 to 125 is a 25% increase: ((125 − 100) ÷ 100) × 100 = 25%. Use the "Percentage increase/decrease" tab to calculate this automatically.

Question 3

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

Accepted Answer

Divide the smaller (or relevant) number by the total, then multiply by 100. For example, to find what percent 30 is of 150, calculate (30 ÷ 150) × 100 = 20%. Use the "X is what percent of Y?" tab above for instant results.

Question 4

Can this tool calculate discounts and price increases?

Accepted Answer

Yes. Use the "X% increase/decrease of a number" tab to calculate a discount (decrease) or markup (increase) on any price. For example, a 20% discount on a $150 item would show a final price of $120.

Question 5

Why am I seeing "—" instead of a number?

Accepted Answer

This appears when a calculation would involve dividing by zero, such as when the original value is set to 0 in a percentage change calculation. Enter a non-zero value to see a valid result.

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Percentage Calculator

30

Everything You Need to Know About Percentage Calculations

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