Free BMI calculator
Calculate your Body Mass Index with metric or imperial units. See your BMI category based on WHO guidelines sharp sharp.
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Wetin be BMI?
Body Mass Index, or BMI, na simple calculation wey base on your height and weight. Di standard formula na:
BMI = weight (kg) ÷ height² (m)
E dey use am as one quick way to check if person get weight-related health risk. BMI no measure body fat direct, but e give you fast way to see where your height and weight fall inside standard groups.
BMI good as starting point, no be full health check. E fit overestimate body fat for person wey get plenty muscle, and underestimate am for older people wey don lose muscle. E also no account for how body composition different, how fat distribute, age, sex, or ethnic background.
BMI categories (WHO)
| Category | BMI range |
|---|---|
| Serious thinness | < 16 |
| Moderate thinness | 16 – 16.9 |
| Small thinness | 17 – 18.4 |
| Normal weight | 18.5 – 24.9 |
| Pre-obese | 25 – 29.9 |
| Obese class I | 30 – 34.9 |
| Obese class II | 35 – 39.9 |
| Obese class III | ≥ 40 |
Frequently asked questions
Which BMI be healthy for adults?
World Health Organization (WHO) talk say healthy BMI na 18.5–24.9. If BMI dey below 18.5, na underweight; 25–29.9 na pre-obese (overweight); and 30 or more na obese. Dis threshold fit work for most adults, but e fit no be correct for all ethnic groups.
BMI dey accurate for women?
BMI dey use di same formula for men and women, but women dey naturally carry more body fat for di same BMI. So BMI fit small under-estimate health risk for women. E still dey useful as screening tool, but make you combine am with other measures like waist circumference to get better full picture.
Why BMI no dey count muscle mass?
BMI just dey measure weight relative to height — e no fit tell fat and muscle apart. Person wey get plenty muscle fit get BMI for overweight range even if im body fat low well well. For better accuracy, consider body fat percentage measurement or DEXA scan.
Wetin be BMI prime?
BMI prime na your BMI divide by 25 (di upper limit of normal range). If your BMI prime na 1.0, e mean say you dey exactly for top of healthy range. Values wey dey below 1.0 na normal or underweight; above 1.0 dey show overweight or obese. E dey make comparison across BMI thresholds easy.
How I fit calculate BMI by hand?
For metric units: divide your weight for kilograms by your height for metres squared. Example: 70 kg ÷ (1.75 × 1.75) = 22.9. For imperial units: (weight for pounds × 703) ÷ (height for inches)². Our calculator dey do am automatically for both unit systems.
Dem fit use BMI for children?
Standard adult BMI thresholds no apply to children. For age 2–19, dem dey use BMI-for-age percentiles (from growth charts) instead. Pikin dey considered healthy if im BMI dey between di 5th and 85th percentile for im age and sex. Dis calculator na for adults only.
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