BMI Calculator - Nigeria
Calculate adult Body Mass Index (BMI) using weight in kilograms and height in feet and inches. Results appear below the button after calculation.
Enter your measurements
BMI Calculation Results
Enter your measurements and click Calculate BMI. Your calculated results will appear in this panel.
Your BMI category will appear here.
The weight range is a mathematical BMI reference, not a personal weight-loss target or medical recommendation. Consult a qualified healthcare professional for individual advice.
How BMI is calculated
BMI = weight (kg) ÷ [height (metres)]². Convert feet and inches to metres: height (metres) = (feet × 12 + inches) × 0.0254. Example: 70 kg at 5 ft 7 in = 70 ÷ (1.7018 × 1.7018) ≈ 24.2.
Adult BMI screening categories
- Below 18.5: Underweight
- 18.5 to below 25: Standard adult BMI range
- 25 to below 30: Overweight
- 30 or above: Obesity
These are general adult screening thresholds. BMI does not distinguish muscle from fat, may be less informative for certain populations and is not suitable for evaluating pregnancy or children's growth.
Frequently asked questions
What is BMI?
Body Mass Index (BMI) is weight in kilograms divided by height in metres squared.
How do I calculate BMI?
Divide your weight in kilograms by the square of your height in metres.
What is the standard adult BMI range?
For most adults, BMI below 18.5 is underweight, 18.5 to below 25 is the standard range, 25 to below 30 is overweight, and 30 or higher is obesity.
Can BMI diagnose a health condition?
No. BMI is a screening measure and does not diagnose a condition or directly measure body fat.
Does BMI work for children?
This calculator is for adults aged 20 and older. Children and teenagers require age- and sex-specific BMI-for-age interpretation.
Is BMI accurate for athletes or pregnancy?
BMI can be misleading for muscular people and is not intended to assess pregnancy-related weight changes.
Does this calculator use Nigerian units?
Enter your height in feet (ft) and additional inches (in), and weight in kilograms (kg).
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Medical disclaimer: This calculator is informational and is not a diagnosis or substitute for professional medical advice. Seek medical advice for health concerns.