Free BMI Calculator
Calculate your body mass index instantly, see your BMI category, and check a general healthy weight range. Free, private, and easy to use.
Your Measurements
100% client-side. Your data stays in your browser.
Unit System
Height
Results
BMI Reference
Formula Used
BMI = weight (kg) ÷ height (m)²
BMI Category Ranges
- Underweight< 18.5
- Normal weight18.5 – 24.9
- Overweight25.0 – 29.9
- Obesity≥ 30.0
BMI is a general population-level screening estimate. It does not account for muscle mass, bone density, age, or other individual factors. This tool does not provide medical advice.
Quick Examples
Calculate your BMI instantly and see a general healthy weight range based on your height.
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a simple number calculated from your height and weight. It is used as a general screening tool to classify body weight relative to height across adult populations.
How is BMI calculated?
In metric units: BMI = weight (kg) divided by height (m) squared. In imperial units: BMI = 703 × weight (lb) divided by height (in) squared.
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is generally considered healthy for most adults. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classified as obese.
Does this calculator support metric and imperial units?
Yes. Select Metric to enter height in centimetres and weight in kilograms. Select Imperial to enter height in feet and inches, and weight in pounds.
Does this tool store my data?
No. All calculations happen entirely in your browser. No measurements are sent to any server, stored, or tracked.
Is BMI medical advice?
No. BMI is a general population-level estimate and does not account for muscle mass, bone density, age, sex, or other individual health factors. Always consult a qualified healthcare professional for medical advice.