Adult BMI Calculator

Calculate a general BMI guide in metric or imperial units.

Starting figures are examples. Change every value to match your circumstances.

Enter your figures

Measurement units

Age (years)

Sex

Ethnic background (optional)

Ethnic background changes the reference ranges, not your BMI number. NHS guidance uses lower thresholds for South Asian, Chinese, other Asian, Middle Eastern, Black African and African-Caribbean backgrounds, including mixed or multiple ethnicities with an Asian, Black or Middle Eastern background: overweight from 23 and obesity from 27.5. Other backgrounds, or no selection, use the standard thresholds of 25 and 30. BMI is a general guide, not a diagnosis. Your selection stays in your browser unless you choose Email my estimate. It is not saved in the calculator database.

Weight (kg)

Height (cm)

Weight: stone (st)

Weight: additional pounds (lb)

Height: feet (ft)

Height: additional inches (in)

Updates automatically

Your estimate

Your estimate will appear here when the calculator is ready.

Email my estimate

Optional. Use an email address you own.

Your email address

News and offers (optional)

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Request records: 90 days. Inputs/results are not saved in the calculator database. Privacy policy (opens in a new tab).

Before you use the result

For adults aged 18 and over. Age and sex are required context and do not change the adult BMI number. Ethnic background changes the reference thresholds, not the BMI calculation. Do not use during pregnancy, with an eating disorder or a condition affecting height. BMI cannot distinguish muscle from fat and is not a diagnosis. Speak to a health professional if you have concerns.

NHS adult BMI guidance (opens in a new tab)

Calculations run locally unless you choose “Email my estimate”. That action sends your figures to the server for recalculation and email delivery, without saving inputs or results in the calculator database. Enter your own email address. BMI requires separate explicit consent to emailing health data and any ethnicity details you provide. Other site features and mail providers have their own processing. Read the privacy policy.

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Adult BMI Calculator

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Your estimate

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