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# Body Mass Index (BMI) calculator

Body Mass Index(BMI) is a simple calculation using a person’s height and weight.

The formula is BMI = kg/m2 where kg is a person’s weight in kilograms and m2 is their height in meters squared. A BMI of 25.0 or more is overweight, while the healthy range is 18.5 to 24.9.

The user needs to fill in some information like age, gender, height & weight. Out of this information height & weight is used to calculate the BMI. Then the BMI passes through conditions.

Each condition has a remark (underweight, Normal, overweight, etc). The result is displayed using a message box as shown above.

The above code was used to come up with BMi ranges .

BMI Categories:

• Underweight = <18.5

• Normal weight = 18.5–24.9

• Overweight = 25–29.9

• Obesity = BMI of 30 or greater

Below is how the code was formulated

#Import tkinter,an interface that will be used to calculate BMI

from tkinter import*from tkinter import messagebox

```# Defining parameters
def reset_entry():age_tf.delete(0,'end')height_tf.delete(0,'end')weight_tf.delete(0,'end')
def calculate_bmi():kg = int(weight_tf.get())m = int(height_tf.get())/100bmi = kg/(m*m)bmi = round(bmi, 1)bmi_index(bmi)
def bmi_index(bmi):if bmi < 18.5:messagebox.showinfo('bmi-pythonguides', f'BMI = {bmi} is Underweight')
elif (bmi > 18.5) and (bmi < 24.9):messagebox.showinfo('bmi-pythonguides', f'BMI = {bmi} is Normal')
elif (bmi > 24.9) and (bmi < 29.9):messagebox.showinfo('bmi-pythonguides', f'BMI = {bmi} is Overweight')
elif (bmi > 29.9):messagebox.showinfo('bmi-pythonguides', f'BMI = {bmi} is Obesity')
else:messagebox.showerror('bmi-pythonguides', 'something went wrong!')```