Loading page
Tool workspace
Preparing this tool for you.
Tool workspace
Calculate your Body Mass Index
About this tool
Calculate your Body Mass Index
BMI Calculator estimates your Body Mass Index from your height and weight and shows which standard category it falls in. It's a quick, private way to get a general read on weight relative to height — useful as a starting point, not a diagnosis.
Open BMI Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Enter height/weight in cm/kg or ft/in/lb.
See the standard underweight / normal / overweight bands.
Understand what BMI can and can't tell you.
BMI is a general screening tool, not a diagnosis. It doesn't account for muscle mass, age, or body composition, so treat it as one data point and consult a professional for advice.
Both metric (cm, kg) and imperial (ft/in, lb) are supported.
No — your height and weight stay in your browser.