Percentage Decrease Calculator Formula

Understand the math behind the percentage decrease calculator. Each variable explained with a worked example.

Use the Percentage Decrease Calculator

Formulas Used

Percent Decrease

percent_decrease = ((old_value - new_value) / old_value) * 100

Difference

difference = old_value - new_value

Variables

VariableDescriptionDefault
old_valueOriginal Value80
new_valueNew Value60

How It Works

How to Calculate Percentage Decrease

Formula

Percentage Decrease = ((Old Value - New Value) / Old Value) × 100

This formula tells you how much a value has decreased relative to the original amount.

Worked Example

A stock price dropped from $80 to $60. What is the percentage decrease?

old_value = 80new_value = 60
  1. 01Difference = 80 - 60 = 20
  2. 02Percentage Decrease = (20 / 80) × 100
  3. 03= 0.25 × 100
  4. 04= 25%

Ready to run the numbers?

Open Percentage Decrease Calculator