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BMI Calculator
Body Mass Index and weight category
Your BMI
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BMI Value
—
Category
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<18.5
Underweight
18.5–24.9
Normal
25–29.9
Overweight
30+
Obese
What is a BMI Calculator?
Calculates Body Mass Index from height and weight to categorise weight status - a quick screening tool for weight-related health risks.
How It Works
BMI = Weight(kg) / Height(m)2. WHO categories: under 18.5 underweight; 18.5-24.9 normal; 25-29.9 overweight; 30+ obese. Asian threshold: 23.
Example
70 kg, 1.75 m: BMI = 22.9 (Normal weight). To reach BMI 24.9: target weight = 24.9 x 3.0625 = 76.2 kg.
Pro Tips
- BMI misclassifies athletes - a 90 kg muscular person at 175 cm has BMI 29 but may be perfectly healthy.
- Waist circumference is a better abdominal obesity indicator: above 90 cm (Indian men), above 80 cm (Indian women).
- Asian Indians face higher metabolic risk at lower BMI - risks increase at BMI 23, not 25.
- Waist-to-height ratio under 0.5 is a practical health target alongside BMI.
FAQ
Healthy BMI range?▼
18.5-24.9 generally; 18.5-22.9 optimal for South Asians due to higher metabolic risk at lower BMI.
Is BMI accurate for all body types?▼
No - overestimates fatness in muscular individuals; underestimates in low-muscle (elderly) people.
BMI threshold for obesity?▼
BMI 30+ worldwide; 27.5+ for Asians per WHO Asian cut-offs; 23+ marks overweight for South Asians.
BMI for children?▼
Children use age and sex-specific BMI percentiles, not adult cut-off values.