BMI Calculator
Calculate your Body Mass Index (BMI) using metric or imperial units, see BMI category indicators, health risks, your ideal weight range, and learn about BMI interpretation.
BMI Categories
| Category | BMI Range (kg/m²) | Health Risk |
|---|---|---|
| Underweight | < 18.5 | Malnutrition risk |
| Normal weight | 18.5 – 24.9 | Low risk |
| Overweight | 25.0 – 29.9 | Enhanced risk |
| Obesity Class I | 30.0 – 34.9 | Moderate risk |
| Obesity Class II | 35.0 – 39.9 | Severe risk |
| Obesity Class III | ≥ 40.0 | Very severe risk |
- BMI is a screening tool, not a definitive measure of health or body composition.
- Muscle mass, ethnicity, age, and sex can affect interpretation. Consult a healthcare provider for a full assessment.
- BMI may misclassify athletes and older adults.
- See the chart for a quick category lookup and explanation.
BMI: Understanding and Limitations
- Does not differentiate between fat and muscle mass
- May misclassify muscular people as overweight or obese
- Does not account for age, sex, ethnicity, or fat distribution
- Not valid for children, pregnant women, the elderly, or certain ethnic groups
- Adopt a balanced, nutritious diet
- Increase physical activity
- Consult your healthcare provider for personalized advice
BMI Calculator – Know Your Body Mass Index & Health Risk Instantly
Your health journey starts with awareness—and that means understanding your BMI (Body Mass Index). Our BMI Calculator helps you determine whether you’re underweight, normal weight, overweight, or obese based on your height and weight.
Quick, accurate, and essential for anyone interested in weight management, fitness planning, or preventive health care.
🧠 What Is BMI?
BMI (Body Mass Index) is a number calculated using your weight and height. It gives an estimate of body fat and is widely used to identify:
- ⚠️ Underweight
- ✅ Normal (healthy) weight
- ⚠️ Overweight
- 🚨 Obesity levels
It’s a screening tool—not a diagnostic—but a very helpful starting point for health conversations.
🧮 How the BMI Calculator Works
Just enter your:
- 📏 Height (in cm or feet/inches)
- ⚖️ Weight (in kg or lbs)
- 🧑 Gender (optional but used for insights)
You instantly receive:
- ✅ Your BMI score
- 📊 BMI category
- 🩺 Health risk summary
- 💡 Suggestions for improvement (if needed)
📉 BMI Categories Chart
| BMI Range | Category | Health Risk |
|---|---|---|
| Less than 18.5 | Underweight | Nutritional deficiency |
| 18.5 – 24.9 | Normal weight | Low |
| 25.0 – 29.9 | Overweight | Increased risk |
| 30.0 – 34.9 | Obesity Class I | High risk |
| 35.0 – 39.9 | Obesity Class II | Very high risk |
| 40.0 and above | Obesity Class III | Extremely high risk |
🔢 Example Calculation
Height: 5’7″ (170 cm)
Weight: 75 kg (165 lbs)
Formula:
BMI = weight (kg) / height (m²)
= 75 / (1.7 × 1.7)
= 25.95
🟡 Result: Overweight
⚠️ Suggest monitoring lifestyle habits or consulting a healthcare provider.
🧰 Features of Our BMI Calculator
- 🧮 Supports metric & imperial units
- 📱 Mobile-responsive design
- ⚙️ Gender-specific insights (optional)
- 🗂️ Auto-classification into BMI categories
- 📊 Visual results & tips
🧑⚕️ Who Should Use a BMI Calculator?
- 🧍 Individuals on a fitness journey
- 🧘♀️ People seeking preventive health info
- 🩺 Doctors and health coaches for patient tracking
- 👨👩👧 Parents tracking child BMI development
- 🧑💼 Office professionals managing weight
🔥 Features Included
- BMI calculator
- Body mass index calculator
- Healthy weight range
- BMI for men and women
- BMI chart by age
- Calculate BMI online
- Overweight BMI health risks
- BMI vs body fat
🧭 Related Internal Tools on Desmos Calculators
- Ideal Weight Calculator – Know your healthy range
- Calorie Calculator – Balance intake for target BMI
- Macronutrient Calculator – Customize your nutrition plan
🔗 External Trusted Sources
- CDC – About Adult BMI
- NHS – BMI Healthy Weight Calculator
- World Health Organization – BMI Classification
✅ Final Thoughts
The BMI Calculator is more than just a number—it’s your first step toward better health awareness. While not a perfect measure (it doesn’t account for muscle mass or bone density), it gives a quick and trusted estimate of your weight status.