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BMI Calculator – Calculate Body Mass Index Free

Q: What is a healthy BMI range?

According to WHO, a healthy BMI is between 18.5 and 24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese. However, BMI is just one indicator — consult a doctor for a complete health assessment.

Q: How do I calculate my BMI?

BMI = Weight in kg ÷ (Height in metres)². Example: If you weigh 70 kg and are 1.70 m tall, BMI = 70 ÷ (1.70)² = 70 ÷ 2.89 = 24.2 (Normal weight). Use the calculator above for instant results.

Q: Is BMI accurate for athletes?

BMI is less accurate for athletes and muscular individuals because muscle weighs more than fat. An athlete with high muscle mass may show a high BMI despite having low body fat. Body composition tests like DEXA scans are more accurate for athletes.

Q: What is the BMI formula in pounds and inches?

BMI = (Weight in pounds × 703) ÷ (Height in inches)². For example, 154 lbs at 67 inches (5'7"): BMI = (154 × 703) ÷ 67² = 108,262 ÷ 4,489 = 24.1.

Q: Does BMI differ for men and women?

The BMI formula is the same for both men and women. However, women typically have more body fat than men at the same BMI, and healthy body fat percentages differ by sex. BMI is a general screening tool, not a precise measurement of body composition.

Calculate your Body Mass Index (BMI) instantly. Enter weight and height in metric or imperial units. Includes BMI chart, WHO categories, and health guidance. Free, no login.

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⚖️ BMI Calculator – Body Mass Index

Weight (kg)

Height (cm)

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UnderweightNormalOverweightObeseMorbid

📋 WHO BMI Classification

BMI Range	Category	Risk Level
< 18.5	Underweight	Low (other risks)
18.5 – 24.9	Normal weight	Minimal
25.0 – 29.9	Overweight	Increased
30.0 – 34.9	Obese Class I	High
35.0 – 39.9	Obese Class II	Very High
≥ 40.0	Obese Class III	Extremely High

What is BMI and How is it Calculated?

Body Mass Index (BMI) is a measure of body fat based on height and weight. It is widely used by healthcare professionals worldwide as a quick screening tool for weight categories. While not a diagnostic tool, BMI provides a useful starting point for health assessment.

📐 BMI Formula

Metric: BMI = Weight (kg) ÷ Height (m)²

Imperial: BMI = 703 × Weight (lb) ÷ Height (in)²

Example: 70 kg at 1.70 m → BMI = 70 ÷ 2.89 = 24.2 (Normal)

⚠️ BMI Limitations

BMI does not account for muscle mass, bone density, age, sex, or fat distribution. Athletes may have high BMI despite low body fat. Always consult a healthcare professional for a complete health assessment.

BMI Calculator — FAQs

What is a healthy BMI range?

According to WHO, a healthy BMI is between 18.5 and 24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese. However, BMI is just one indicator — consult a doctor for a complete health assessment.

How do I calculate my BMI?

BMI = Weight in kg ÷ (Height in metres)². Example: If you weigh 70 kg and are 1.70 m tall, BMI = 70 ÷ (1.70)² = 70 ÷ 2.89 = 24.2 (Normal weight). Use the calculator above for instant results.

Is BMI accurate for athletes?

BMI is less accurate for athletes and muscular individuals because muscle weighs more than fat. An athlete with high muscle mass may show a high BMI despite having low body fat. Body composition tests like DEXA scans are more accurate for athletes.

What is the BMI formula in pounds and inches?

BMI = (Weight in pounds × 703) ÷ (Height in inches)². For example, 154 lbs at 67 inches (5'7"): BMI = (154 × 703) ÷ 67² = 108,262 ÷ 4,489 = 24.1.

Does BMI differ for men and women?

The BMI formula is the same for both men and women. However, women typically have more body fat than men at the same BMI, and healthy body fat percentages differ by sex. BMI is a general screening tool, not a precise measurement of body composition.