BMI (Body Mass Index) is a measure of body fat based on height and weight. It is calculated as weight in kg divided by height in metres squared (kg/m²).

BMI is a useful screening tool but is not a diagnostic measure. It doesn't account for muscle mass, bone density, age, or ethnic differences. Athletes may have a high BMI without excess body fat.

What is the ideal BMI for Indians?

The WHO uses 18.5–24.9 as normal for all adults, but some studies suggest South Asians (including Indians) have higher health risks at lower BMIs. An adjusted healthy range for Indians is often considered 18–22.9.

Does it work on mobile?

Yes, fully responsive — works on all devices.

BMI Calculator — Check Your Body Mass Index & WHO Category Instantly

Q: What is a healthy BMI range?

For adults, a BMI of 18.5–24.9 is considered normal/healthy. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese.

Calculate your BMI instantly with metric or imperial units. See your BMI category, healthy weight range, and personalised health tips. Free, no signup.

📖 Read BMI Calculator Guide

Weight

Height

Age (optional — for context)

years

Male Female

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Enter your height and weight

BMI will appear here

Underweight
<18.5 Normal
18.5–25 Overweight
25–30 Obese
>30

Healthy Weight Range

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BMI Category

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Weight to Lose/Gain

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Ideal Weight (Hamwi)

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⚕️ This tool is for informational purposes only. Consult a healthcare professional for medical advice.

What is the BMI Calculator?

The BMI (Body Mass Index) Calculator computes your BMI from your weight and height and shows your category (underweight, normal, overweight, obese), your healthy weight range, and how much weight you need to lose or gain to reach a healthy BMI. Supports both metric (kg/cm) and imperial (lbs/ft/in) units.

How to Calculate BMI — Step-by-Step

Choose Metric (kg, cm) or Imperial (lbs, ft, in).

Enter your weight and height . Your BMI calculates instantly.

See your BMI category, healthy weight range , and personalised health tip.

📊 BMI Categories Reference Chart

BMI Range	Category	Health Risk
Below 18.5	Underweight	Malnutrition risk, weak immunity
18.5 – 24.9	Normal weight ✓	Low risk — maintain this range
25.0 – 29.9	Overweight	Increased risk of heart disease, diabetes
30.0 – 34.9	Obese Class I	High risk — consult a doctor
35.0 and above	Obese Class II/III	Very high risk — medical attention needed

Frequently Asked Questions

What is BMI?

BMI (Body Mass Index) is weight in kg divided by height in metres squared. For example, 70 kg ÷ (1.75m²) = BMI of 22.9.

What is a healthy BMI?

18.5–24.9 is considered normal/healthy. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese.

Is BMI accurate?

BMI is a useful screening tool but doesn't account for muscle mass, bone density or body fat distribution. Athletes may have a high BMI without excess fat.

What is a healthy BMI for Indians?

The WHO standard is 18.5–24.9, but research suggests South Asians face higher metabolic risk at lower BMIs. An adjusted healthy range for Indians is often considered 18–22.9.

Is this BMI calculator free?

Yes, 100% free with no signup required. All calculations happen in your browser.

📚 Educational Content — Deep Dive

BMI was developed by Belgian statistician Adolphe Quetelet in the 1830s. The formula is: BMI = weight(kg) / height(m)² . For imperial units: BMI = (weight(lbs) / height(in)²) × 703 . While widely used by healthcare professionals as a quick screening tool, BMI has known limitations — it overestimates body fat in muscular people and underestimates it in sedentary individuals who may have lost muscle mass.