Overview
BMI Calculator is an easy and free online tool that runs in your browser.
BMI Calculator
BMI Calculator
Free online BMI Calculator. Calculate your Body Mass Index instantly to assess your weight status. Get personalized calorie recommendations. Private and secure.
health
How people use it
This browser-based tool is designed to be fast, easy to use, and private by default. Open the tool, adjust the settings, and get results instantly without creating an account or sending files to a server.
Everything runs locally in the browser whenever possible, which reduces friction for users and makes the page more useful as a direct-answer landing page from search.
Common topics
The following topics are closely related to this tool and help explain what it is for:
- bmi
- weight
- health
- calories
- fitness
- body mass index
Quick answers
How is BMI calculated?
BMI = weight(kg) / height(m)^2. In Imperial mode, your height/weight are converted to metric for the calculation.
What BMI categories does this tool use?
It uses common adult thresholds: Underweight < 18.5, Normal 18.5–24.9, Overweight 25–29.9, Obese ≥ 30.
What is the “Ideal Weight Range” based on?
It shows the weight range that corresponds to BMI 18.5–24.9 for your entered height.