# Percentage Decrease Calculator

Use the below percentage decrease calculator to calculate the percentage decrease:

The percentage decrease calculator is an easy & handy tool to calculate decrease change in percentage. To calculate this change in percentage, we must first understand the formula behind it & the concept used. We will provide you with all the essential knowledge about the percentage change calculation with the help of in-depth examples. Percentage change is a concept that is widely used in classrooms as well as the practical world. For example – discounts on products.

### Prerequisite:

You should have knowledge of basic mathematic subtraction, addition, multiplication & division, i.e. +, -, x, /.

## How to Calculate Percentage Decrease?

Percentage Decrease – Percentage decrease gives us the detail of the decrease of the final value over the initial value in parts of 100. It is a unidirectional detail about the percentage decrease in the value. If we find a percentage decrease of 25 %, it would mean that the value will decrease by 25 for every 100 units, i.e. for a 25% decrease, the initial value of 100 would lose 25 units & the final value would become 75

Follow the steps below to Calculate the percentage increase:

1. Subtract New value (N) from Original value (O)
2. Divide the result of ‘Step 1’ by the Original value (O)
3. Multiply the result of ‘Step 2’ by 100

So, the percentage increase formula becomes – (O-N / O) x 100

Note: If a number is decreased by more than 100% then it will give a negative number.

## Formula to Calculate Percentage Decrease Change:

The formula used to calculate the percentage decrease is `(O-N / O) x 100`

In this formula, ‘N’ is the new value & ‘O’ is the original value

## Examples of percentage Decreases:

Let us look at some examples of a percentage increase to get more clarity.

### Example 1

Calculate the percentage change when the value of 20 becomes 10.

Solution:

Here, we are given the following data:

1. Initial value – 20
2. Final value – 10

Now, as we can see that the value is decreasing in nature so the formula for percentage change will become the same as the formula for percentage decrease calculation.

Let us follow the Steps discussed earlier:

Step 1 – Initial value – Final value = 20 – 10 = 10

Step 2 – Result of ‘Step 1’ / Initial value = 10 / 10 = 1

Step 3 – Result of ‘Step 2’ x 100 = 1 x 100 = 100%

Therefore, in this case, the percentage decrease is 100%.

### Example 2

Calculate the percentage change when the value of 200 becomes 50.

Solution:

Here, we are given the following data:

1. Initial value – 200
2. Final value – 50

Now, as we can see that the value is increasing in nature so the formula for percentage change will become the same as the formula for percentage increase calculation.

Let us follow the Steps discussed earlier:

Step 1 – Initial value – Final value = 200 – 50 = 150

Step 2 – Result of ‘Step 1’ / Initial value = 150 / 200 = 0.75

Step 3 – Result of ‘Step 2’ x 100 = 0.75 x 100 = 75%

Therefore, in this case, the percentage decrease is 75%.

### Example 3

Calculate the percentage change when the value of 25 becomes 10.

Solution:

Here, we are given the following data:

1. Initial value – 25
2. Final value – 10

Now, as we can see that the value is increasing in nature so the formula for percentage change will become the same as the formula for percentage increase calculation.

Let us follow the Steps discussed earlier:

Step 1 – Initial value – Final value = 25 – 10 = 15

Step 2 – Result of ‘Step 1’ / Initial value = 15 / 25 = 0.60

Step 3 – Result of ‘Step 2’ x 100 = 0.60 x 100 = 60%

Therefore, in this case, the percentage decrease is 60%.

### Example 4

Calculate the percentage change when the value of 80 becomes 20.

Solution:

Here, we are given the following data:

1. Initial value – 80
2. Final value – 40

Now, as we can see that the value is increasing in nature so the formula for percentage change will become the same as the formula for percentage increase calculation.

Let us follow the Steps discussed earlier:

Step 1 – Initial value – Final value = 80 – 40 = 40

Step 2 – Result of ‘Step 1’ / Initial value = 40 / 80 = 0.50

Step 3 – Result of ‘Step 2’ x 100 = 0.50 x 100 = 50%

Therefore, in this case, the percentage decrease is 50%.

## FAQs

### How to calculate a 10% decrease?

To calculate a 10% decrease in a number, follow the below steps:

1. Divide the original number, for which the decrease is to be calculated, by 10 (10/100)
2. Subtract the number obtained from Step 1 from the original number
3. for ex: a 10% decrease on 40 can be calculated as 40 – (40/10) = 36

Alternative method:

We can calculate a 10% decrease on a number by directly calculating 90% of that number.

for ex: a 10% decrease on 50 can be calculated as 50 * (90/100) = 45

### How to calculate a 20% decrease?

To calculate a 20% decrease in a number, follow the below steps:

1. Divide the original number, for which the decrease is to be calculated, by 5 (20/100)
2. Subtract the number obtained from Step 1 from the original number
3. for ex: a 20% decrease on 25 can be calculated as 25 – (25/5) = 20

Alternative method:

We can calculate a 20% decrease in a number by directly calculating 80% of that number.

for ex: a 20% decrease on 20 can be calculated as 20 * (80/100) = 16

### How to calculate a 25% decrease?

To calculate a 25% increase in a number, follow the below steps:

1. Divide the original number, for which the decrease is to be calculated, by 4 (25/100)
2. Subtract the number obtained from Step 1 from the original number
3. for ex: a 25% decrease on 24 can be calculated as 24 – (24/4) = 18

Alternative method:

We can calculate a 25% decrease on a number by directly calculating 75% of that number.

for ex: a 25% decrease on 200 can be calculated as 200 * (75/100) = 150

### How to calculate a 200% decrease?

To calculate a 200% decrease in a number, follow the below steps:

1. Multiply the original number, for which the decrease is to be calculated, by 2 (200/100)
2. Subtract the number obtained from Step 1 from the original number
3. for ex: a 200% decrease on 1000 can be calculated as 1000 – (1000*2) = -1000

Alternative method:

We can calculate a 200% decrease on a number by directly calculating -100% of that number.

for ex: a 200% decrease on 500 can be calculated as 500 * (-100/100) = -500

### How to calculate a 150% decrease?

To calculate a 150% decrease in a number, follow the below steps:

1. Multiply the original number, for which the decrease is to be calculated, by 1.5 (150/100)
2. Subtract the number obtained from Step 1 from the original number
3. for ex: a 150% decrease on 60 can be calculated as 60 – (60*1.5) = -30

Alternative method:

We can calculate a 150% decrease on a number by directly calculating -50% of that number.

for ex: a 150% decrease on 30 can be calculated as 30 * (-50/100) = -15