Free Online BMI Calculator
Free Online BMI Calculator
Calculate your Body Mass Index (BMI) instantly. Find out if you are underweight, normal, overweight, or obese — with health insights.
🏋️ Calculate Your BMI
What Is BMI?
BMI (Body Mass Index) is a simple measurement that uses your height and weight to estimate whether you are at a healthy weight. It is used worldwide by doctors, health organizations, and fitness experts as a quick screening tool.
Why Use Our BMI Calculator?
Our BMI calculator is fast, accurate, and free. It supports both metric (kg / cm) and imperial (lb / in) units. You also get your healthy weight range, prime BMI, and personalized health tips — all instantly in your browser.
Key Benefits
- ✅ Instant BMI — with color-coded category
- ✅ Metric & Imperial — kg/cm or lb/in
- ✅ Healthy weight range — for your height
- ✅ Visual scale — see where you fall
- ✅ Health tips — based on your BMI
- ✅ 100% private — no data stored
How to Use the BMI Calculator
- Choose Metric or Imperial units.
- Enter your weight.
- Enter your height.
- Your BMI updates automatically — see your category.
BMI Categories
Perfect For:
Fitness
Track your weight goals.
Health
Quick wellness screening.
Diet
Set realistic weight targets.
Tracking
Monitor progress monthly.
❓ Frequently Asked Questions
What is a healthy BMI?
A healthy BMI is between 18.5 and 24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
BMI is a general guide. It may not be accurate for athletes, pregnant women, children, or the elderly. Consult a doctor for personal advice.
What is the BMI formula?
Metric: BMI = weight (kg) ÷ height² (m²). Imperial: BMI = (weight (lb) × 703) ÷ height² (in²).
Does the tool store my data?
No. Everything runs in your browser. Your height and weight are never sent anywhere.
Can I use it for children?
BMI for children uses age- and sex-specific percentiles, not the adult scale. Please consult a pediatrician.
Does it work on mobile?
Absolutely. The BMI calculator is fully responsive and works on phones, tablets, and desktops.
