## Fold Increase Calculator

## Fold Decrease Calculator

*Created by Team y2calculate*

*Content written by Madison *

*Coding and design by Marcelino *

*Reviewed by Sajid khan*

Fact checked 🔍✓

Enter the initial value and final value, click the calculate button, and the calculator will display both fold increase and fold decrease. Fold increase means a number is increased by a multiple of the original number, and fold decrease means a number is decreased by a multiple of the original number. For a better understanding, see the formulas and examples below; they will help your understanding more better.

## Fold increase and fold decrease formulas with examples

The formula for calculating fold increase (\(FI\)) is given:

\[ FI = \frac{F}{I} \]This represents how much the final number of cells (\(F\)) increases compared to the initial number of cells (\(I\)).

The formula for calculating fold decrease (\(FD\)) is given:

\[ FD = \frac{I}{F} \]This represents how much the initial number of cells (\(I\)) decreases compared to the final number of cells (\(F\)).

Where:

- \(FI\): Fold Increase
- \(FD\): Fold Decrease
- \(I\): Initial Number of Cells
- \(F\): Final Number of Cells

Let's say the initial number of red blood cells (\(I\)) is \(4,000,000\) and after a period of production, the final number (\(F\)) increases to \(20,000,000\).

Using the fold increase formula:

\[ FI = \frac{20,000,000}{4,000,000} = 5 \]Therefore, the final number of red blood cells is five times greater than the initial number.

Now, consider the initial number of white blood cells (\(I\)) as \(10,000\) and after an immune response, the final number (\(F\)) decreases to \(2,000\).

Using the fold decrease formula:

\[ FD = \frac{10,000}{2,000} = 5 \]Therefore, the initial number of white blood cells is reduced to one-fifth of the final number after the immune response.

## What is fold increase and decrease?

The terms “fold increase” or “fold decrease” are commonly used in scientific, mathematical, and biological contexts to express the ratio of one quantity to another It indicates how much one value has changed relative to another.

For example, if you have an initial value of 5 and it increases to 20, the fold increase would be 20 divided by 5, which is 4. So, in this case, there is a 4-fold increase.

Conversely, if the initial value of 20 decreases to 5, the fold decrease would also be 20 divided by 5, which is 4. So, in this case, there is a 4-fold decrease.

## FAQs

To calculate fold decrease just divide the initial number by the final number

Fold decrease = initial number/final number.

let let’s say we have initially 10,000 shares of a company, after some time we sold 5,000 shares so the fold decrease is 2, indicating that the number of shares decreased to half of the original amount after selling 5,000 shares.

2 fold decrease means that the number is decreased to half the original number, let say we have 10 apples after giving 5 to children the fold decrease will be 2, which means apples decreased by half the original number

A 10-fold decrease means a number is reduced to one-tenth of the original number. For example, if we initially have 10,000 viral particles in a medium, and after adding an antiviral drug, the viral particles remain only 1000. This indicates that they are reduced to one-tenth of the original number.

A 1-fold change can either decrease or increase. When we talk about a 1-fold increase, it means the number or quantity has increased by one time the original number. In the case of a 1-fold decrease, it means the number or quantity has decreased by 100% of the original quantity, which means nothing is left.