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Percentage Change Calculator

Use this calculator to work out the percentage increase or percentage decrease from one number to another.

Disclaimer: Whilst every effort has been made in building this calculator, we are not to be held liable for any damages or monetary losses arising out of or in connection with the use of it. This tool is here purely as a service to you, please use it at your own risk. Full disclaimer. Do not use calculations for anything where loss of life, money, property, etc could result from inaccurate calculations.

How to calculate percentage change

The aim of our calculator is to help you work out the percentage increase or decrease between two numbers - a start value and an end value. If you want to work out a percentage of a number, or what percentage a number represents of its bigger counterpart, give the percentage calculator a try. For now, let's get into how to calculate a percentage increase or percentage decrease.

Percentage change formula

\( \dfrac{(endValue - startValue)}{startValue} \times 100 \)

Using this formula, when numbers go up, you can work out the percentage increase. When numbers go down, you can work out the decrease. You need to make sure you do the calculation in the correct order, using PEMDAS. So, brackets first.

Percentage increase example

If your landlord is increasing your rent from $650 to $700 per month, you may wish to know what the percentage increase is. Let's work it out...

  1. New number - old number = increase

    $700 (new rent) - $650 (old rent) = $50 increase
  2. (increase / old number) × 100

    $50 (increase) / $650 (old number) = 0.0769.

    Then × 100 = 7.69% increase

You can learn more about how to calculate percentage change in our article, How to Calculate Percentages.

If you have any problems using this percentage change calculator, please contact me.