BMI Calculator Singapore (2026)

In Singapore, a BMI of 23.0 and above is considered overweight. This is lower than the WHO international threshold of 25.0. Singapore uses Asia-Pacific BMI thresholds recommended by the Health Promotion Board (HPB) because Asian populations face higher health risks at lower BMI levels.

Research shows that Asians develop health complications like diabetes and cardiovascular disease at lower BMI levels compared to Western populations. The Asia-Pacific BMI thresholds (18.5 underweight, 23.0 overweight, 27.5 obese) reflect this increased risk profile.

A healthy BMI range for Singaporean adults is 18.5 to 22.9. Below 18.5 is underweight, 23.0 to 27.4 is overweight, and 27.5 and above is obese according to HPB guidelines.

BMI is a useful screening tool but has limitations. It does not distinguish between muscle and fat mass, so athletes may have a high BMI but low body fat. It also does not account for age, gender, or body composition. For a more complete picture, consider waist circumference and body fat percentage.

BMI is calculated by dividing your weight in kilograms by your height in metres squared: BMI = weight (kg) ÷ height (m)². For example, a person weighing 65 kg and standing 1.70 m tall has a BMI of 65 ÷ (1.70 × 1.70) = 22.5.

Standard BMI calculations are not meaningful during pregnancy because the weight gain is expected and healthy — maternal fat, amniotic fluid, placenta, and the baby itself all contribute to weight. Healthcare providers in Singapore use pre-pregnancy BMI (if known) to guide appropriate weight gain targets during pregnancy, following MOH and HPB guidelines. Weight gain targets differ by pre-pregnancy BMI category: underweight women are advised to gain more, overweight women less. BMI should not be used to assess health status during pregnancy.

BMI for children and adolescents is interpreted differently from adults — it is plotted on age- and sex-specific growth reference charts as a BMI-for-age percentile. MOE and HPB use Singapore-specific growth charts for Singaporean children based on local population data. A child at the 85th–95th percentile is considered overweight; above the 95th percentile is obese. The adult Asian-Pacific cut-offs (23 overweight, 27.5 obese) do not apply to children. If your child's school health screening flags a concern, the school nurse will provide context based on the age-appropriate chart.

A BMI above 27.5 puts you in the obese category under Singapore's Asian-Pacific guidelines, which carries elevated risk for type 2 diabetes, hypertension, cardiovascular disease, and sleep apnoea. The recommended first steps are: see your GP for a full health screening (fasting glucose, cholesterol panel, blood pressure, BMI and waist circumference), request a referral to a dietitian for a personalised meal plan, and begin a structured exercise programme with at least 150 minutes of moderate aerobic activity weekly. HPB's Lose To Win programme and the National Steps Challenge offer structured community support. Medically supervised weight loss (including pharmacotherapy) is available through polyclinics and private clinics if lifestyle intervention alone is insufficient.

Waist circumference is a complementary measure, not a replacement. While BMI captures overall weight relative to height, waist circumference specifically measures abdominal fat — the visceral fat that drives metabolic disease. HPB recommends waist thresholds of ≤90cm for Asian men and ≤80cm for Asian women. Combining both measures is more informative than either alone: someone at BMI 23 with waist circumference above threshold has higher cardiovascular risk than the BMI alone suggests. For assessing cardiometabolic risk in Singaporeans, the combination of BMI + waist circumference is the clinical standard.

Yes — the Singapore/Asian-Pacific BMI cut-offs (18.5–22.9 healthy, 23.0–27.4 overweight, ≥27.5 obese) apply to both adult men and women. The cut-offs are the same because BMI is a population-level screening tool and the cardiovascular risk thresholds have been validated across both sexes in Asian populations. However, what constitutes healthy body fat percentage differs by sex — women naturally carry more body fat than men at equivalent BMI, and this is normal and expected. The health risk thresholds for waist circumference also differ by sex: ≤90cm for men, ≤80cm for women.