BMI Explained: What is a Healthy Weight for Your Height?

July 19, 2025 • 4 min read

Body Mass Index (BMI) is the most widely used screening tool for weight categories. While it has limitations, understanding your BMI gives you a starting point for conversations with healthcare providers about healthy weight management.

The BMI Formula

Example: A person weighing 70 kg who is 1.75 m tall: BMI = 70 / (1.75 × 1.75) = 70 / 3.0625 = 22.9

BMI Categories (Adults)

• ▶ Underweight: Below 18.5
• ▶ Normal weight: 18.5 - 24.9
• ▶ Overweight: 25.0 - 29.9
• ▶ Obese Class I: 30.0 - 34.9
• ▶ Obese Class II: 35.0 - 39.9
• ▶ Obese Class III: 40.0 and above

What is a "Healthy" BMI?

The "normal" range of 18.5-24.9 is associated with the lowest statistical risk of weight-related health conditions. However, BMI alone does not determine health. It is one data point among many that doctors consider.

Quick Reference by Height

Healthy weight ranges (BMI 18.5-24.9) for common heights:

• ▶ 5'0" (152 cm): 47-58 kg (104-128 lbs)
• ▶ 5'4" (163 cm): 49-67 kg (108-145 lbs)
• ▶ 5'8" (173 cm): 55-76 kg (122-164 lbs)
• ▶ 6'0" (183 cm): 62-84 kg (136-184 lbs)
• ▶ 6'2" (188 cm): 65-89 kg (144-194 lbs)

Important Context

• ▶ BMI does not distinguish between muscle and fat — a muscular athlete may have a "high" BMI while being perfectly healthy
• ▶ It does not account for age, sex, ethnicity, or body composition
• ▶ Some populations have different risk thresholds (e.g., WHO suggests lower cutoffs for Asian populations)
• ▶ BMI is a screening tool, not a diagnostic one — it identifies who might need further assessment

If you are concerned about your weight or health, BMI is a useful starting point — but speak with a healthcare professional for personalised guidance that considers your complete health picture.