# Percent Decrease Calculator: How Much Did it Go Down?

Written by:
PK

On this page is a percent decrease calculator. Enter your starting amount and a lower ending amount and the tool will tell you how much the decrease is before the second and first value.

## What is the Percent Decrease Formula?

The percentage decrease formula is:

(\frac{(final-initial)}{initial})*100

Subtract the final number from the first number (you'll be left with a negative number). Next, divide the initial number. After multiplying by 100, you'll be left with a negative percentage – that tells you how much the decrease is between the initial and final.

### Percent Decrease Formula Example

Now, let's work through an example of computing a percentage decrease. If your initial number was 100 and your final number was 50, that's a 50% decrease.

Here's how it works:

(\frac{50-100}{100})*100 \\ \frac{-50}{100}*100\\-.5*100=-50\%

## Using the Percent Decrease Calculator

To run the calculator, enter the starting number (initial value) then the final number. Then, hit the 'Calculate' button to run the math and return a percentage.

The percent decrease calculator is a spin off of these calculators:

Also try our other calculators and tools.

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