Percentage Calculator: Find Percentages, Increases, and Decreases.

1. Find a Percentage
What is % of =
30
2. Find the Whole
is what % of =
30%
3. Percentage Change (Increase/Decrease)
Change from to =
+ 50%

Free Online Percentage Calculator

Welcome to the Percentage Calculator by CalcHub Pro. Whether you are solving math homework, calculating a retail discount, or figuring out the return on an investment, percentages are a part of daily life. Our free tool provides three dedicated calculators to solve any percentage problem instantly.

How to Calculate Percentages Manually

  • Finding a Percentage (What is 20% of 150?): Convert the percentage to a decimal by dividing it by 100 (20 ÷ 100 = 0.20). Then, multiply that decimal by the whole number (0.20 x 150 = 30).
  • Finding the Whole (45 is what % of 150?): Divide the part by the whole (45 ÷ 150 = 0.30). Then, multiply the result by 100 to get the percentage (0.30 x 100 = 30%).

How to Calculate Percentage Increase or Decrease

Finding the percentage change between two numbers is critical in business and finance. For example, if a stock goes from $50 to $75, what is the percentage increase?

The Formula: ((New Number - Old Number) ÷ Old Number) x 100.

Using our example: ((75 - 50) ÷ 50) = 0.5. Multiply by 100 to get a 50% Increase.

Frequently Asked Questions (FAQ)

How do I calculate a store discount?
If a $100 shirt is 25% off, you can use the first calculator on this page. Calculate "What is 25% of 100" (which is $25). Subtract that $25 from the original price to get your final cost of $75.

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