BMI calculator

BMI = weight (kg) ÷ height (m)². As per the Health Promotion Board, a BMI of 18.5 to 22.9 is healthy, 23.0 to 27.4 puts you at moderate risk, and 27.5 and above at high risk of weight-related health problems.

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Units
cm
kg

Result

Please complete the details. The result will appear here.

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 Health Promotion Board risk levels for adults in Singapore

CategoryBMI
Below the healthy rangeBelow 18.5
Healthy18.5 to 22.9
Moderate risk23.0 to 27.4
High risk27.5 and above

These ranges apply to adults. As per the Health Promotion Board, they may not apply if you are pregnant, have a muscular build or are below 18 years of age.

Worked examples

Height 160 cm, weight 58 kg

Details
Height 160 cm, weight 58 kg.
Result
BMI 22.7, Healthy

Height 170 cm, weight 66.5 kg (at the limit)

Details
Height 170 cm, weight 66.5 kg.
Result
BMI 23.0, Moderate risk

Height 170 cm, weight 80 kg

Details
Height 170 cm, weight 80 kg.
Result
BMI 27.7, High risk

Height 165 cm, weight 45 kg

Details
Height 165 cm, weight 45 kg.
Result
BMI 16.5, Below the healthy range

Official sources

Applies to: Current (HealthHub article last reviewed 10 May 2023).

  1. Health Promotion Board (HealthHub): Weight, BMI and Health Problems

Last reviewed on 27 October 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.