How to use BMI Calculator
- Choose metric or imperial units.
- Enter height and weight.
- Review your BMI and category label.
Worked examples
Concrete numbers and cases you can check against the tool above.
5′10″ and 170 lb
BMI = 703 × weight(lb) / height(in)². Height 70 in, weight 170 lb → 703 × 170 / 4900 ≈ 24.4, which falls in the standard “healthy weight” band (18.5–24.9) used on many charts. BMI does not measure fat vs muscle and is not a diagnosis.
175 cm and 70 kg
Metric formula: kg / m². 70 / 1.75² = 70 / 3.0625 ≈ 22.9. Same person as a slightly lighter 5′9″ frame would be. Enter height once; mixing cm with inches is the usual source of impossible results like BMI 3 or 90.
When to use BMI Calculator
BMI is a quick screening number used in many wellness contexts. Calculating it privately in the browser is convenient — with the caveat that it is not a diagnosis.
Common use cases
- Estimate BMI before a routine checkup form.
- Compare metric vs imperial inputs for accuracy.
- Track a rough trend alongside other health notes.
- Educate students on how BMI is computed.
Inputs and outputs
- Metric: centimeters / kilograms
- Imperial: feet-inches / pounds
Privacy
This tool runs entirely in your browser. Your data never leaves your device — nothing is uploaded to our servers.
Frequently asked questions
- What is a healthy BMI range?
- Common adult charts treat roughly 18.5–24.9 as a standard “normal” range, but healthy bodies vary. Ask a clinician for personal advice.
- Is BMI accurate for athletes?
- BMI does not distinguish muscle from fat, so muscular people may score higher without excess fat.
- Do you store my measurements?
- No. Calculations stay on your device.