BMI Calculator
Computes Body Mass Index from metric or imperial height and weight inputs, categorizing the result into underweight, normal, overweight, and obese, with a healthy weight range for your height. Health data never leaves your device — every calculation runs locally in your browser.
How to Use the BMI Calculator
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Frequently Asked Questions
What units does the BMI calculator support?
Both metric (kg/cm) and imperial (lbs/ft-in) inputs are supported. Toggle between units and the calculator converts and computes your BMI instantly.
What BMI categories are shown?
The result is categorized into underweight (below 18.5), normal weight (18.5–24.9), overweight (25–29.9), and obese (30+). These are the standard WHO classifications.
Is BMI accurate for athletes?
BMI does not distinguish between muscle and fat. Athletes with high muscle mass may have an elevated BMI despite low body fat. Use it as a general indicator, not a diagnostic tool.
Can I save my BMI history?
The calculator shows your current result plus the healthy range for your height (18.5–24.9 × height²): at 170 cm that is 53.5–72.0 kg, downloadable as CSV. For tracking over time, note your BMI values manually or use the companion health calculators on the site.
Is my data stored anywhere?
No. All calculations run locally in your browser. No height, weight, or BMI data is transmitted or stored on any server.
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Last updated October 2026