How to Calculate Increase Percentage Formula

April 24, 2025 3 min read

Understanding percentage increases is a valuable skill, whether you're tracking investment growth, analyzing sales figures, or just trying to understand changes in everyday costs. This article breaks down the formula and offers practical examples, so you can easily calculate percentage increases in any situation.

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The Increase Percentage Formula Explained

The increase percentage formula measures the relative change between two values – an original value and a new value. It expresses this change as a percentage of the original value.

Here's the formula:

Percentage Increase = [(New Value - Original Value) / |Original Value|] × 100

Where:

  • New Value: The value you are comparing to the original.
  • Original Value: The starting value.
  • |Original Value|: The absolute value of the Original Value

Steps to Calculate Increase Percentage

  1. Find the Difference: Subtract the original value from the new value. This gives you the amount of the increase.
  2. Divide by the Original Value: Divide the increase by the absolute value of the original value. Using the absolute value is important here, so that you can calculate percentage increases from negative starting numbers.
  3. Multiply by 100: Multiply the result by 100 to express the increase as a percentage.

Real-World Examples

Example 1: Tracking Stock Growth

Suppose you bought a stock for $50, and now it's worth $65. What's the percentage increase?

  1. Difference: $65 - $50 = $15
  2. Divide: $15 / $50 = 0.3
  3. Multiply: 0.3 × 100 = 30%

The stock's value increased by 30%.

Example 2: Sales Increase

A store's sales went from 150 units last month to 180 units this month. Calculate the percentage increase.

  1. Difference: 180 - 150 = 30
  2. Divide: 30 / 150 = 0.2
  3. Multiply: 0.2 × 100 = 20%

The store experienced a 20% increase in sales.

Example 3: Price Change of Fuel

The price of fuel went from $2.00 to $2.75. Calculate the percentage increase.

  1. Difference: 2.75 - 2.00 = 0.75
  2. Divide: 0.75 / 2.00 = 0.375
  3. Multiply: 0.375 x 100 = 37.5%

The price of fuel increased by 37.5%.

Percentage Increase vs. Percentage Decrease

The same formula can be used to calculate a percentage decrease. If the new value is lower than the original value, the result will be a negative percentage, indicating a decrease.

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While the formula is straightforward, calculating percentage increases can be even easier! Our percentage calculator helps you solve these problems quickly and accurately. Whether you need to find what percent of a number is, figure out what percentage one number is of another, or calculate increase/decrease, our tool can do it all.

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