Percentage Decrease Calculator

Calculate percentage decrease from an original value and a new value, then review the size of the decrease and whether the value actually went down.

Measure how much a value went down from the original number

Use this percentage decrease calculator when checking price drops, traffic declines, inventory reductions, budget cuts, or any before-and-after change where the main question is how much lower the new value is.

Original value New value

Enter an original value and a lower new value to calculate percentage decrease.

Ready

Enter two values to calculate percentage decrease.

The main decrease result will appear here as soon as both values are valid.

This calculator focuses on decreases and tells you when the new value is not lower than the original value.

Enter the original value you want to use as the starting point.
Enter the new value you want to compare against it.
Review the main result to see whether the current numbers produce a percentage decrease.
Use the supporting values to compare the original value, new value, and decrease amount.
Use Example to load a sample decrease or Clear to reset the calculator.

Calculate percentage decrease from 200 to 150
Find percentage decrease for a price drop
Calculate how much lower the new value is
Check whether two numbers produce a percentage decrease

This tool compares an original value with a new value and calculates percentage decrease when the new number is lower. It also makes the result explicit when the new value is unchanged or higher, so you do not mistake an increase for a decrease.

A percentage decrease calculator is useful for discounts, price drops, sales declines, budget reductions, inventory decreases, analytics comparisons, and any before-and-after change where the direction should be a decrease.

Percentage decrease focuses on how much lower the new value is than the original one. Percentage increase focuses on how much higher the new value is. This page is designed to answer the decrease question first and call out when the numbers actually represent an increase.

How do I calculate percentage decrease between two numbers?

Enter the original value and the new value. If the new value is lower, the calculator divides the decrease amount by the original value and returns the percentage decrease.

What happens if the new value is higher than the original value?

The calculator tells you that the current numbers do not produce a percentage decrease and indicates that the change is an increase instead.

Can I use this for discounts and price drops?

Yes. This calculator is a good fit for discounts, markdowns, and any price-drop comparison where the original price is the base value.

Why can't the original value be 0?

Percentage decrease uses the original value as the denominator. If the original value is 0, the formula would not be valid.

Percentage Decrease Calculator

Calculate percentage decrease instantly

Measure how much a value went down from the original number

Percentage decrease result

How to use the percentage decrease calculator