04-02: BMI Calculator & Health Advisor¶

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Calculates BMI from weight and height (metric or imperial), shows the WHO health category, and prints a personalised advice message alongside the healthy weight range for the user's height.

Topics covered: arithmetic operators · if/elif/else · float() type conversion · try/except input validation · functions · f-strings · named constants

Difficulty: ⭐ Beginner

Two Versions¶

This folder contains two versions of the project:

main.py — the AI-written code.
project02.ipynb — the practiced, human-made version (it's a .ipynb file because it was practiced in Jupyter Notebook).

The two are similar in structure and behaviour. The explanation below is for main.py only.

How to Run¶

python main.py

No external libraries — pure Python 3.

Sample Output¶

═══════════════════════════════════════════════════════
       BMI Calculator & Health Advisor
═══════════════════════════════════════════════════════

Your name: Jahid
Unit system: metric / imperial: metric
Weight (kg): 72
Height (m): 1.75

═══════════════════════════════════════════════════════
  BMI Report for Jahid
═══════════════════════════════════════════════════════
  Weight   : 72.0 kg  (158.7 lbs)
  Height   : 1.75 m  (175 cm)
  BMI      : 23.5
  Category : Normal weight
─────────────────────────────────────────────────────
  Advice   : Great work! Maintain your current lifestyle ...
─────────────────────────────────────────────────────
  Healthy weight range for your height:
    56.7 kg – 76.6 kg
═══════════════════════════════════════════════════════

Key Concepts Practised¶

Concept	Where used
Arithmetic operators (`/`, `**`)	BMI formula
`float()` + `try/except`	Input validation
`if/elif/else`	BMI category
Named constants	`BMI_UNDERWEIGHT`, `BMI_NORMAL_HIGH`
Functions with return values	`calculate_bmi()`, `bmi_category()`
Unit conversion	Imperial → metric
f-strings with format spec	Results display