Here we look at how to calculate a percentage decrease – this is where your initial value (x) has reduced to a lower value (y).
Percentage Decrease Calculator
How to work out percentage decrease - the forumula
To work out a percentage decrease you need to calculate the decrease, divide the decrease by the original value and then multiply that amount by 100.With the figures above you would do the following:
100 - 80 = 20 Then: 20 / 100 = 0.2 Then: 0.2 x 100 = 20 - showing a 20% decrease in the amount.