## What Is the BMI?

**BMI (Body Mass Index) **is a standard index first proposed by **Adolphe Quetelet **in the **1830s**. It gives an insight into a person’s physical fitness status. The formula involves **Height **and **Weight**. The general expression of **BMI **is:

**BMI**=**Weight**/**Height ^{2 }_{ }**

## What Is Z Score?

The basic formula for the calculation of the **Z Score** is given below:

**x **= The raw data.

**µ **= Mean/Average of the dataset.

**σ **= The standard deviation of the given dataset.

**Z **= Final score of each data.

The **Z Score **shows the distance of data from the **Mean **in the **Standard Deviation **unit. If it’s 0, the value is in the mean value.

If the **Z Score **is 1, the value is 1 **Standard Deviation **above the **Mean value**. If it’s -1, the value is a **Standard Deviation **below the **Mean value**.

## How to Calculate BMI Z Score in Excel – 4 Steps

In the following dataset, height and weight of patients are listed.

### Step 1 – Prepare the Dataset

- Convert the data to Metric Units:
**Weight**in**KG**and**Height**in**Meters.**

### Step 2 – Calculate the BMI

- Select
**E5**and enter the following formula:

`=D5/(C5*C5)`

The **BMI**** **is calculated.

- Drag down the Fill Handle to see the result in the rest of the cells.

### Step 3 – Calculate the Standard Deviation and Mean of the Dataset

**Steps**

- Select
**J5**and enter the following formula:

`=STDEV.P(E5:E14)`

- It will calculate the
**Standard Deviation**in**E5:E14.**

- Select
**J6**and use the formula:

`=AVERAGE(E5:E14)`

- It will calculate the mean of data in
**E5:E14.**

### Step 4 – Calculate the Z Score

**Steps**

- Select
**F5**and enter the following formula:

`=(E5-$J$6)/$J$5`

- It will calculate the
**Z-Score**of the**BMI**value in**E5**.

** **

- Drag down the Fill Handle to see the result in the rest of the cells.

**An Alternative Way to Calculate the Z Score**

**Steps**

- Select
**F5**and enter the following formula

`=STANDARDIZE(E5,$J$6,$J$5)`

- Drag down the Fill Handle to see the result in the rest of the cells.

** **

**Download Practice Workbook**

Download the practice workbook.

**<< Go Back to BMI | Formula List | Learn Excel**