BMI Calculator – Your Health, Simplified
Get your Body Mass Index, ideal weight range, body fat estimate, and personalized health recommendations – all in seconds.
Your Details
BMI Scale
Personalized Recommendations
Weight Planner
Progress Tracker
Body Composition
Ideal Weight Formulas
| Formula | Weight (kg) |
|---|
Health Risk Analysis
Daily Macronutrient Targets
Daily Water Intake
Understanding BMI
What is BMI?
Body Mass Index (BMI) is a measure of body fat based on height and weight. It is widely used as a screening tool to identify potential weight problems in adults.
WHO BMI Classification
| Category | BMI Range |
|---|---|
| Severely Underweight | < 16.0 |
| Underweight | 16.0 – 18.4 |
| Normal | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obesity Class I | 30.0 – 34.9 |
| Obesity Class II | 35.0 – 39.9 |
| Obesity Class III | ≥ 40.0 |
BMI is a screening tool, not a diagnostic tool. It should be interpreted alongside other health metrics.
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a simple ratio of weight to height used to screen for weight categories that may lead to health problems.
How accurate is BMI?
BMI is a useful population-level tool but has limitations. It doesn't distinguish muscle from fat, so athletes may have high BMI but low body fat.
What is a healthy BMI?
A BMI between 18.5 and 24.9 is generally considered healthy for most adults.
Can BMI be wrong?
Yes. BMI can misclassify muscular individuals, older adults, and pregnant women. It's best used alongside other measures.
What is the ideal weight for my height?
Your ideal weight depends on your height, frame, and muscle mass. This calculator provides a range based on several established formulas.
How does body fat relate to BMI?
BMI and body fat percentage are correlated but not identical. This calculator estimates body fat using BMI, age, and gender.
Is BMI different for children?
Yes. Pediatric BMI uses age and gender-specific percentiles. This calculator is intended for adults 18+.
How often should I check my BMI?
Every few months is sufficient for most people. More frequent tracking can help with weight management goals.
What is the Waist-to-Height Ratio?
A measure of fat distribution. A ratio below 0.5 is generally associated with lower health risk.
Why does my BMI say I'm overweight but I'm fit?
Muscle is denser than fat. If you're athletic, you may have a higher BMI but a healthy body fat percentage. This is a known limitation of BMI.
What is a good BMI for older adults?
For adults over 65, a BMI between 23 and 28 is often associated with better health outcomes.
How does pregnancy affect BMI?
BMI is not accurate during pregnancy. Use weight gain guidelines from your healthcare provider instead.
What is the Asian BMI classification?
Some health organizations use lower BMI cutoffs for Asian populations due to higher health risks at lower BMIs.
Can I use this calculator for athletes?
Yes, but be aware that BMI may overestimate body fat in athletes. Use the body fat and waist-to-height metrics for a better picture.
What is the difference between BMI and BMR?
BMI measures body composition; BMR (Basal Metabolic Rate) measures the calories your body burns at rest.
How do I lose weight safely?
Gradual weight loss (0.5-1 kg per week) through balanced nutrition and exercise is generally recommended. Consult a professional for personalized advice.
What is the best exercise for my BMI?
The calculator provides recommendations based on your BMI category. Always consult a fitness professional for personalized plans.
Does this calculator store my data?
No. All calculations are performed locally in your browser. Your data is never sent to a server.
Can I print my results?
Yes – use the "Print Report" button for a clean, printer-friendly summary.
Is this calculator medical grade?
This is an educational tool. Always consult a qualified healthcare professional for medical decisions.