# 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!')

Again, using is the coping your code in a code snippet is better than using images.

Where in your code did you implement displaying the result as you described?