What is BMI?

BMI stands for Body Mass Index. It is a simple measurement that uses your weight and height to estimate whether you are at a healthy weight. BMI is calculated by dividing your weight in kilograms by your height in metres squared.

The World Health Organisation (WHO) uses BMI as a standard screening tool to identify potential weight problems in adults. While BMI does not directly measure body fat, it is a reliable indicator used by doctors, nutritionists, and health organisations worldwide.

BMI Categories — What Your Number Means

Once you calculate your BMI, your result falls into one of these categories defined by the WHO:

BMI Range	Category	Health Risk
Below 18.5	Underweight	Moderate risk — nutritional deficiency
18.5 — 24.9	Normal weight	Low risk — healthy range
25.0 — 29.9	Overweight	Increased risk — lifestyle changes advised
30.0 — 34.9	Obese Class I	High risk — medical advice recommended
35.0 — 39.9	Obese Class II	Very high risk
40 and above	Obese Class III	Extremely high risk

BMI Calculator for Pakistan Army, PAF and Navy

If you are preparing for Pakistan Army, Pakistan Air Force (PAF), or Pakistan Navy recruitment, BMI is one of the key physical fitness requirements. Candidates who fall outside the acceptable BMI range are rejected at the medical examination stage regardless of their other test scores.

Pakistan Army BMI requirement: Candidates must have a BMI between 18.5 and 27.5 for most regiments. Some special forces may have stricter requirements.

PAF BMI requirement: The Pakistan Air Force requires a BMI between 18.5 and 25.0 for pilots and aircrew. Ground staff requirements are slightly more flexible.

Pakistan Navy BMI requirement: The Pakistan Navy generally requires a BMI between 18.5 and 27.0 for most roles.

How to Calculate BMI in Pakistan — Step by Step

You can calculate BMI manually using this formula:

BMI = Weight (kg) ÷ Height (m) × Height (m)

For example if you weigh 70 kg and your height is 1.75 metres: BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.0625 = 22.9 — which is in the Normal weight range.

Or simply use the free BMI calculator above — enter your weight and height and get your result instantly in both metric and imperial units.

Limitations of BMI

BMI is a useful screening tool but it has limitations. It does not distinguish between muscle and fat — a very muscular athlete may have a high BMI but actually have very low body fat. It also does not account for age, gender, or where fat is distributed on your body.

For a complete health assessment, always consult your doctor alongside using BMI as a guide. For authoritative BMI information visit the World Health Organisation website or NHS BMI page.

How to Improve Your BMI

If your BMI is outside the healthy range, small consistent lifestyle changes make a significant difference over time.

If you are overweight (BMI 25–29.9):

Start with a 30-minute daily walk, reduce sugary drinks and processed foods, and aim for a 500-calorie daily deficit through diet and exercise. Read our guide on how to save money on healthy eating for budget-friendly tips.

If you are underweight (BMI below 18.5):

Focus on calorie-dense nutritious foods — nuts, dairy, whole grains, lean meats, and healthy fats. Consult your doctor to rule out underlying health conditions.

If you are obese (BMI 30+):

Medical guidance is strongly recommended. Read our complete guide on weight loss methods including Ozempic for medically supervised options.