Health · BMI check
BMI Reality Check
Calculate your BMI and get the WHO category — with a strong disclaimer that BMI is a blunt population tool, not a personal health verdict.
Instant result
Plain-English why
Copyable takeaway
What this means
BMI divides weight by height squared to produce a number that population studies use to categorise weight status. It is a starting point, not a health verdict.
Formula used
BMI = weight (kg) ÷ height (m)²
Worked example
75 kg at 175 cm — BMI = 75 ÷ (1.75)² = 24.5. Healthy weight range by WHO classification.
Common questions
Why is BMI a blunt instrument?
BMI uses height and weight only. It cannot distinguish muscle from fat, does not account for where fat is distributed on the body, and is less accurate for older adults, athletes, or people from some ethnic backgrounds where the thresholds may not apply well.
Should I be worried about my BMI result?
A result outside the healthy range is a prompt to talk to a doctor, not a verdict. A GP can assess your actual health picture using clinical measures that a height-weight calculation cannot provide.
Plain-English summary
Enter your height and weight to get your BMI and a category — alongside an honest note about what the number can and cannot tell you.
This section translates the result into a short, direct takeaway rather than leaving the page at a bare number.
Read the guide
What BMI can and cannot tell you about your health
A plain guide to what the BMI calculation measures, where it is unreliable, and why it is a starting point rather than a verdict.
Read the guideRelated instruments
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