BMI Calculator
Calculate Body Mass Index and get personalized health category recommendations.
BMI Calculator
Your Measurements
Enter height and weight for instant BMI analysis
Your BMI Result
BMI Category Guide
Understand where you fall on the health spectrum.
BMI Scale
Set Your Health Goal
Select a goal to see your progress update in real time.
Population Comparison
How your BMI compares to averages.
Health Insights
Personalized takeaways from your numbers.
Real-Life Examples
70 kg · 170 cm
85 kg · 180 cm
The Formula Behind It
BMI = weight (kg) / height (m)²Variables
- Weight (kg)
- Height (m)
- BMI = weight / height²
How It Works
- Select metric (kg/cm) or imperial (lbs/inches) units.
- Enter your current weight.
- Enter your height.
- View your BMI score and health category instantly.
About BMI Calculator
The Body Mass Index (BMI) Calculator is a widely used screening tool that estimates body fat based on your height and weight. While BMI doesn’t directly measure body fat, it provides a useful starting point for assessing whether your weight falls within a healthy range for your height.
Understanding BMI Categories
The World Health Organization classifies BMI into these categories: Underweight (BMI below 18.5), Normal weight (18.5 to 24.9), Overweight (25 to 29.9), and Obese (30 and above). These ranges apply to most adults aged 18-65.
Limitations of BMI
BMI is a useful population-level metric but has limitations for individuals. It doesn’t distinguish between muscle and fat mass — athletes may have high BMI despite low body fat. It doesn’t account for fat distribution (abdominal fat is riskier). Age, sex, and ethnicity can affect interpretation. Asian populations may face health risks at lower BMI thresholds.
Using BMI for Health Goals
Use BMI as one data point alongside waist circumference, body composition analysis, blood pressure, cholesterol levels, and overall fitness. Consult a healthcare provider for personalized health assessment. If your BMI is outside the normal range, focus on sustainable lifestyle changes — balanced nutrition and regular physical activity — rather than crash diets.
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a measure of body fat based on height and weight, used to categorize weight status.
How is BMI calculated?
BMI = weight in kilograms divided by height in meters squared (kg/m²).
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered healthy for most adults.
Is BMI accurate for everyone?
BMI doesn't distinguish muscle from fat. Athletes may have high BMI despite low body fat.
What BMI is considered obese?
BMI of 30 or higher is classified as obese. 25-29.9 is overweight.
Can children use this BMI calculator?
This calculator is for adults. Children require age and sex-specific BMI percentile charts.
How can I lower my BMI?
Combine balanced nutrition with regular physical activity. Consult a healthcare provider for personalized advice.
Does BMI differ by ethnicity?
Some health organizations suggest lower BMI thresholds for Asian populations due to higher health risks at lower weights.
What is BMI Prime?
BMI Prime is your BMI divided by 25 (upper healthy limit). Values above 1.0 indicate overweight.
Should I rely only on BMI?
No. Combine BMI with waist circumference, body composition, and overall health markers for a complete picture.
Community Stories
Real experiences from people like you.
"Tracked BMI monthly alongside workouts."
Moved from overweight to normal in 8 months