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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.
