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BMI Calculator — Free Body Mass Index Calculator

Calculate your Body Mass Index instantly using metric or imperial units. Get your BMI score, healthy weight range, BMI chart and personalised health advice — free, no signup required.

✓ 100% Free✓ No Signup✓ Metric & Imperial✓ Health Insights✓ BMI History✓ Works Offline

Your Measurements

kg
cm
yrs

BMI interpretation can vary with age

Body fat distribution differs between biological sexes

Your BMI Result

Enter your weight and height above to calculate your BMI

BMI Scale Reference

Severe Underweight< 16.0
Underweight16.0 – 18.4
Normal Weight18.5 – 24.9
Overweight25.0 – 29.9
Obese Class I30.0 – 34.9
Obese Class II35.0 – 39.9
Obese Class III≥ 40.0

Quick Unit Reference

1 kg= 2.205 lbs
1 lb= 0.453 kg
1 ft= 30.48 cm
1 inch= 2.54 cm

How to Use the Free BMI Calculator

Select your preferred unit system (metric or imperial), enter your weight and height, and optionally add your age and biological sex for more personalised health insights. Your BMI score, category, healthy weight range and tailored advice are calculated and displayed instantly — no signup, no data sent to any server.

What Is a Healthy BMI Range?

For most adults, a BMI between 18.5 and 24.9 is considered a healthy weight. A BMI below 18.5 indicates underweight, 25–29.9 is overweight, and 30 or above falls into the obese range. These are general guidelines based on WHO standards — always consult a qualified healthcare professional for a full and personalised health assessment.

Frequently Asked Questions — BMI Calculator

⚠️ Medical Disclaimer: This BMI calculator is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional before making any health or dietary decisions.