How do I calculate BMI if I use pounds and feet?

To calculate BMI using imperial units: BMI = (weight in lbs × 703) ÷ height² (in inches). For example, 154 lbs and 5'9' (69 inches): BMI = (154 × 703) ÷ (69 × 69) = 22.7. Our tool uses metric (kg/cm) — convert lbs ÷ 2.205 for kg, and inches × 2.54 for cm.

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BMI Calculator

Q: What is BMI and how is it calculated?

BMI (Body Mass Index) is a measure of body fat based on your weight and height. The formula is: BMI = weight (kg) ÷ height² (m²). For example, if you weigh 70 kg and are 1.75 m tall, your BMI = 70 ÷ (1.75 × 1.75) = 22.9.

Q: What is a healthy BMI range?

A BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classified as obese according to WHO guidelines.

Q: Is BMI accurate for everyone?

BMI is a useful screening tool but not a perfect measure of health. It does not distinguish between muscle and fat, so athletes with high muscle mass may be classified as overweight despite being healthy. Always consult a healthcare professional for a full assessment.

Q: Can BMI tell me if I need to lose weight?

A BMI over 25 suggests you may be carrying excess weight, but it is just one indicator. Factors like waist circumference, body fat percentage, and overall health history should also be considered. Consult a doctor before making any decisions about weight loss.

Check your Body Mass Index

Weight (kg)

Height (cm)

What is Body Mass Index (BMI)?

The Body Mass Index (BMI) is a simple screening tool widely used to categorize a person's weight relative to their height. It provides a useful estimate of whether an individual is underweight, at a healthy weight, overweight, or obese.

BMI Categories

Underweight (Below 18.5): May indicate malnutrition or other health issues.
Normal Weight (18.5 - 24.9): Generally associated with the lowest health risks.
Overweight (25.0 - 29.9): Increased risk of developing health problems.
Obese (30.0 and above): Higher risk of cardiovascular disease, diabetes, and other conditions.

Limitations of BMI

While BMI is a good general indicator, it doesn't measure body fat directly. It doesn't distinguish between muscle mass and fat mass. Therefore, athletes with high muscle mass might be categorized as overweight despite being fit. Always consult a healthcare professional for a comprehensive assessment.

Free BMI Calculator Online — Check Your Body Mass Index

The Body Mass Index (BMI) is a widely-used measurement that estimates whether your weight is appropriate for your height. Our free online BMI calculator gives you an instant result — just enter your weight in kilograms and your height in centimetres, and you'll see your BMI value along with your health category. No account or signup is needed.

BMI is used by doctors, nutritionists, and health organisations worldwide as a quick screening tool. While it has limitations (see FAQ below), it remains one of the most accessible ways to understand your approximate weight status and take the first step toward better health.

How to Use the BMI Calculator

Enter your weight in kilograms (e.g., 70 kg). To convert pounds to kg, divide by 2.205.
Enter your height in centimetres (e.g., 175 cm). To convert feet/inches: multiply feet by 30.48 and add inches × 2.54.
Click "Calculate BMI" — your BMI score and category will appear instantly.
Read your category: Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), or Obese (≥30).

Frequently Asked Questions

What is BMI and how is it calculated?

BMI = weight (kg) ÷ height² (m²). A person weighing 70 kg at 1.75 m has a BMI of 70 ÷ (1.75 × 1.75) = 22.9, which is in the Normal range.

What is a healthy BMI range?

The WHO defines Normal weight as a BMI of 18.5 to 24.9. Below 18.5 is Underweight; 25–29.9 is Overweight; 30 and above is Obese.

Is BMI accurate for everyone?

BMI doesn't measure body fat directly — it can misclassify very muscular athletes as overweight, and older adults may have a "normal" BMI despite having high body fat. Use it as a starting point, not a definitive diagnosis.

How do I calculate BMI using pounds and feet?

Use the imperial formula: BMI = (weight in lbs × 703) ÷ height² (in inches). Or simply convert: lbs ÷ 2.205 = kg, and inches × 2.54 = cm, then use this calculator.

Can BMI tell me if I need to lose weight?

A BMI over 25 is a signal worth discussing with a doctor — but it is just one of many health indicators. Waist circumference, blood pressure, and cholesterol are equally important.

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