Free Online BMI Calculator
Calculate your Body Mass Index (BMI) using your height and weight with our free online BMI Calculator. Get an instant BMI result and general weight category.
Calculate Your BMI
Choose metric or imperial units, enter your height and weight, and instantly calculate your BMI along with its general adult BMI category.
Your BMI result will appear here.
Adult BMI Categories
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What Is a BMI Calculator?
A BMI Calculator estimates your Body Mass Index using your height and weight. BMI is a simple screening measure commonly used to place adult weight-to-height ratios into general categories such as underweight, healthy weight, overweight, and obesity.
Our calculator supports both metric and imperial measurements, allowing you to calculate BMI using kilograms and centimeters or pounds, feet, and inches.
How to Use the BMI Calculator
- Choose Your Measurement System – Select Metric for kilograms and centimeters or Imperial for pounds, feet, and inches.
- Enter Your Weight – Enter your current weight using the selected measurement system.
- Enter Your Height – Enter your height in centimeters or feet and inches.
- Calculate Your BMI – Click Calculate BMI to see your BMI value and general adult BMI category.
Why Use Our BMI Calculator?
- Metric & Imperial Units – Calculate BMI using kilograms and centimeters or pounds, feet, and inches.
- Instant BMI Result – Get your calculated BMI immediately after entering your height and weight.
- Simple BMI Categories – See the general adult BMI category associated with your calculated result.
- Browser-Based Tool – Your BMI calculation runs directly in your browser without requiring an account.
How Is BMI Calculated?
For metric measurements: BMI = Weight (kg) ÷ Height² (m²)
General Adult BMI Categories
Below 18.5 — Underweight
18.5–24.9 — Healthy Weight
25.0–29.9 — Overweight
30.0 and above — Obesity
Important Information About BMI
BMI is a screening measure based on height and weight and does not directly measure body fat, muscle mass, bone density, or overall health. People with the same BMI can have different body compositions, so BMI should not be treated as a diagnosis.
BMI interpretation can also require additional context depending on factors such as age and individual circumstances. If you have questions about your weight, nutrition, or health, consider discussing your results with a qualified healthcare professional.
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Frequently Asked Questions
What does BMI mean?
BMI stands for Body Mass Index. It is calculated using a person’s weight relative to their height.
What BMI is considered a healthy weight for adults?
For general adult BMI classification, a BMI from 18.5 to 24.9 is commonly categorized as healthy weight.
Is BMI an exact measure of body fat?
No. BMI does not directly measure body fat and cannot distinguish between weight from muscle, fat, bone, and other body tissues.
Can I calculate BMI using pounds and feet?
Yes. Select the Imperial option to enter your weight in pounds and height in feet and inches.
Can this BMI Calculator diagnose a health condition?
No. The calculator provides a general BMI screening estimate and is not intended to diagnose any medical condition.
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