Percentage Calculator

Calculate percentages, increases, decreases, and more — step-by-step solutions & visual charts

Choose Calculation Type

Basic Percentage: What is X% of Y?

Example: What is 20% of 150?

Solution: 20% × 150 = 30

Percentage Visualization

0%20%100%
20%

Percentage

20%

Value

30

Frequently Asked Questions (FAQ)

How do I calculate the percentage of a number?

To calculate X% of Y, divide X by 100 and multiply by Y. For example, 20% of 150 = (20/100)×150 = 30. Use our Basic % calculator above.

How to calculate percentage increase?

Percentage increase = [(New Value - Original Value) / Original Value] × 100. From 100 to 150 is a 50% increase. Try the % Increase tab.

What is the percentage decrease formula?

Percentage decrease = [(Original Value - New Value) / Original Value] × 100. Example: 200 to 150 = 25% decrease.

How do I find what percent X is of Y?

Use (X / Y) × 100. 30 is 20% of 150 because (30/150)×100 = 20%. Switch to "% Of" mode above.

Is this percentage calculator free?

Yes, CSC Tool Hub provides this calculator completely free, with no sign-up required. It includes visual charts and step-by-step explanations.

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Percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%".