How to Calculate BMI

÷ SmartCalc 💪 Health Guide Body Mass Index explained — formula, healthy ranges and what your number really means SmartCalc · smart-calculator.in Try BMI Calc →

What is BMI?

÷ SmartCalc 2 / 9 Definition Body Mass Index is a number calculated from your height and weight — used worldwide as a quick health screening tool. 🌍 Used globally 1830s Developed by Quetelet WHO Recommended It estimates body fatness and correlates with health risks like diabetes and heart disease. Swipe for the formula → Calculate Now

The BMI Formula

÷ SmartCalc 3 / 9 📐 Metric Formula Metric (kg & cm) BMI = Weight (kg) ÷ Height² (m²) Example: 70 kg ÷ (1.70)² = 24.2 Imperial (lb & inches) BMI = [Weight (lbs) ÷ Height² (in²)] × 703 Example: 154 lbs ÷ (67)² × 703 = 24.1 Height must be in metres! Try It Free

Step-by-Step Calculation

÷ SmartCalc 4 / 9 📝 Example Given: Height 170cm · Weight 70kg Step 1: Convert height to metres → 170 cm ÷ 100 = 1.70 m Step 2: Square the height → 1.70 × 1.70 = 2.89 Step 3: Divide weight by result → 70 ÷ 2.89 BMI = 24.2 ✓ Normal Weight What does 24.2 mean? → My BMI

BMI Ranges

÷ SmartCalc 5 / 9 📊 WHO Categories Below 18.5 Underweight 18.5 – 24.9 Normal Weight ✓ 25.0 – 29.9 Overweight 30.0 – 34.9 Obese Class I 35.0 – 39.9 Obese Class II 40 and above Obese Class III Special note for Indians → Check Yours

BMI for South Asians

÷ SmartCalc 6 / 9 🇮🇳 India Specific WHO recommends lower thresholds for South Asian populations including Indians. 18.5 – 22.9 Normal (India) 23.0 – 24.9 Overweight (India) 25.0 and above Obese (India) Health risks appear at lower BMI in South Asian adults compared to Western populations. BMI limitations → Calculate BMI

BMI Doesn't Tell Everything

÷ SmartCalc 7 / 9 ⚠️ Limitations 💪 Muscle mass: Athletes may show "obese" BMI despite very low body fat 👴 Age: Older adults carry more fat at the same BMI ⚧️ Sex: Women naturally have higher body fat than men at same BMI 📍 Fat location: Belly fat is more dangerous than hip fat BMI is a screening tool only Try It

Achieve a Healthy BMI

÷ SmartCalc 8 / 9 ✅ How to Improve 🥗 Balanced nutrition — whole foods, lean protein, less processed food 🚶 150 min moderate exercise per week — WHO recommendation 😴 7–9 hours sleep — poor sleep links directly to weight gain 💧 Stay hydrated — drink 2–3 litres water daily Calculate your BMI for free → Get My BMI

Calculate Your BMI Now

÷ SmartCalc 9 / 9 ⚡ Free Tool Free, instant, metric & imperial. No signup. No data stored. Try all 40 calculator tools at SmartCalc. 💪 Open BMI Calculator Also try: Calorie TDEE · Water Intake · Age Calculator