Skip to main content

Free Percentage Change Calculator – Increase or Decrease

Percentage Change Calculator finds the percent increase or decrease between two numbers online for free. Calculate percentage change instantly.

Increase & DecreaseShows FormulaInstantFree

Formula

((New − Old) ÷ |Old|) × 100

100% Private

All calculations run locally in your browser. Nothing is uploaded.

How to Use Percentage Change Calculator

1

Enter Old Value

Type the original starting number.

2

Enter New Value

Type the new number to compare against.

3

View the Change

See the percentage increase or decrease instantly.

Calculate Percent Increase or Decrease Between Two Numbers

The Helperzy Percentage Change Calculator tells you how much a value has gone up or down in percentage terms. Enter the original (old) value and the new value, and it instantly shows the percentage change, whether that is an increase or a decrease, along with the absolute difference between the two numbers. The formula it uses is the standard one: subtract the old value from the new value, divide by the old value, and multiply by 100. A positive result is an increase and a negative result is a decrease. For example, a price rising from 200 to 250 is a 25 percent increase, while falling from 250 to 200 is a 20 percent decrease — and notice those are not the same percentage, which is exactly the kind of mistake the calculator helps you avoid. People use it to track price rises and discounts, measure salary or revenue growth, compare exam scores or performance between two periods, and analyse changes in statistics like followers, traffic, or weight. Because it shows the direction and the exact figure, it is useful for both quick checks and reports. Keep in mind that percentage change is always relative to the starting value, so the same absolute change looks bigger when the original number is small. The calculator runs entirely in your browser, gives instant results, and never stores the numbers you enter.

Frequently Asked Questions – Percentage Change Calculator

Enter the old value and the new value in the Helperzy Percentage Change Calculator. It applies the formula (new minus old) divided by old, times 100, and instantly shows whether the change is an increase or a decrease and by how much.