BMI calculator

BMI = weight (kg) ÷ height (m)². Under the Ministry of Health and Welfare adult standard for Taiwan, a BMI of 18.5 to under 24 is normal, 24 to under 27 is overweight and 27 or above is obese.

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kg

Result

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How it is calculated

  1. BMI = weight (kg) ÷ height (m)².
  2. When feet and pounds are used, BMI = 703 × weight (lb) ÷ height (in)².
  3. BMI is rounded to one decimal place. The category is decided by the rounded value.
  4. Normal weight range = the lower and upper BMI limits of the normal category × height (m)².
  5. BMI is used to check whether body weight is in a suitable range. It is not a diagnosis.
  6. All calculations are done in your browser. The details you enter are not sent to any server.

Categories as per the Ministry of Health and Welfare adult standard for Taiwan

CategoryBMI
UnderweightBMI < 18.5
Normal18.5 ≦ BMI < 24
Overweight24 ≦ BMI < 27
ObeseBMI ≧ 27

These categories apply to adults aged 18 and over. Children and teenagers are assessed by age and sex. They do not apply during pregnancy.

Worked examples

Height 175 cm, weight 70 kg

Details
Height 175 cm, weight 70 kg.
Result
BMI 22.9, Normal

Height 170 cm, weight 72 kg

Details
Height 170 cm, weight 72 kg.
Result
BMI 24.9, Overweight

Height 170 cm, weight 69.36 kg (at the limit)

Details
Height 170 cm, weight 69.36 kg.
Result
BMI 24.0, Overweight

Height 175 cm, weight 90 kg

Details
Height 175 cm, weight 90 kg.
Result
BMI 29.4, Obese

Official sources

Applies to: Current (Ministry of Health and Welfare adult BMI standard).

  1. Health Promotion Administration, Ministry of Health and Welfare (Government Open Data Platform): Body weight status of people aged 18 and over (definitions)

Last reviewed on October 27, 2026.

The rules on this page have been checked against the official sources listed above. The result is for reference. The rules and assessment of the concerned authority shall prevail.