Create a BMI Calculator Command Line Using Python Functions

Create a BMI Calculator Command Line Tool Using Python Functions, in this tutorial you will learn how to build a command-line BMI calculator using Python functions. This tutorial covers Python basics, function creation, and command-line interface development.

In today’s world of health consciousness, Body Mass Index (BMI) remains a widely used metric to categorize individuals based on their weight and height. What better way to practice Python programming than by creating a practical tool? In this tutorial, we’ll build a command-line BMI calculator using Python functions.

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What is BMI? BMI is calculated using the formula:

bmi = (weight * 10000) / (height * height)

Note: Weight in KG and Height in CM
The resulting value falls into categories:

Underweight: BMI < 18.5
Normal weight: 18.5 ≤ BMI < 24.9
Overweight: BMI > 24.9

Create a BMI Calculator Command Line Using Python Functions

Building Our BMI Calculator

Let’s create a Python script that calculates BMI based on user input and provides the corresponding category. create a file name bmi.py.

Create a BMI Calculator Command Line Using Python Functions Code

# Bmi Calculator using function
def calBmi(height,weight):
  # BMI = [weight (kg) / (height (cm))²] x 10000
  bmi = (weight * 10000) / (height * height)
  bmi=round(bmi, 1)
  return bmi

def bmiLevel(bmi):
    if bmi>24.9:
      print("Over weight")
    elif bmi<18.5:
      print("Under weight")
    else:
      print("Normal")
#Taking values from keyboard
print("Enter Weight in KG: ",end=" ")
wet=float(input())
print("Enter Height in CM: ",end=" ")
het=float(input())

bm=calBmi(het,wet)

print(bm)
bmiLevel(bm)
print("Normal Bmi range 18.5 - 24.9")

Run bmi.py: Open Command Prompt / Terminal / konsole and navigate to directory having file bmi.py, and run command given below

python ./bmi.py

python3 ./bmi.py

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