Aim: Measurement of Height, Weight, and Body Mass Index (BMI)
Objective:
To assess body composition by accurately determining height and weight, followed by BMI calculation and interpretation using standard health classification guidelines.
Materials Required:
- Stadiometer or wall-mounted height ruler
- Calibrated digital or manual weighing scale
- Calculator or BMI chart
- Data recording sheet or notebook
- Pen or pencil for documentation
Procedure:
A. Measurement of Height:
1. Ensure the individual is wearing light clothing and no footwear.
2. Ask them to stand straight against a wall with heels, back, and head touching the vertical surface.
3. Eyes should be looking forward, chin parallel to the ground.
4. Using the stadiometer or ruler, measure from the base (floor) to the highest point of the head.
5. Record the height in centimeters (cm) or meters (m).
B. Measurement of Weight:
- Place the weighing scale on a hard, flat, and level surface.
- Ask the subject to remove shoes, bags, or any heavy items.
- Let the individual stand still with feet together, evenly distributing body weight.
- Record the weight in kilograms (kg).
- Wait for the scale to stabilize if using a digital device.
C. Calculation of BMI: Use the standard formula:
BMI = Weight (kg) / Height (m)2
4. Interpretation of BMI:
| BMI Range | Category |
| < 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| ≥ 30.0 | Obese |
Sample Data Table: Height, Weight, and BMI Record
| Date | Height (cm) | Weight (kg) | BMI | Interpretation |
| 20/06/2025 | 165 | 58 | 21.3 | Normal |
| 20/06/2025 | 172 | 75 | 25.3 | Overweight |
| 20/06/2025 | 160 | 47 | 18.4 | Underweight |
| 20/06/2025 | 180 | 96 | 29.6 | Overweight |
| 20/06/2025 | 158 | 83 | 33.3 | Obese |
Precautions:
- Ensure equipment is calibrated and error-free before taking measurements.
- Record data immediately to avoid memory errors.
- BMI does not differentiate between fat and muscle mass, so it should be used with clinical judgment.