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Understanding BMI for Adults

Learn what your BMI number means, what category you fall into, and what the WHO guidelines say.

Hakuna kuingia kinachohitajika
BMI
22.9
Normal weight
1018.5253040

Healthy weight range for your height: 56.7 – 76.3 kg

BMI Categories (WHO)
UnderweightBelow 18.5
Normal weight18.5 – 24.9
Overweight25.0 – 29.9
Obese (Class I)30.0 – 34.9
Obese (Class II)35.0 – 39.9
Obese (Class III)40.0 and above

BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, or fat distribution. Consult a healthcare professional for personalised advice.

Education tips

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Note: this calculator uses adult BMI categories. Children and teenagers require age- and sex-specific BMI percentile charts (BMI-for-age) β€” consult a paediatrician.

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BMI = weight (kg) Γ· heightΒ² (mΒ²). A 70 kg person who is 1.75 m tall: 70 Γ· (1.75 Γ— 1.75) = 70 Γ· 3.0625 = 22.9 (Normal).

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The WHO defines four categories: Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), Obese (30+). These are international standards.

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Some health organisations use lower BMI thresholds for Asian populations, where health risks from excess weight appear at lower BMI values.

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