BMI Calculator
Calculate BMI from height and weight, see which WHO category it falls in, and find the weight range that would put you in the healthy band.
Body mass index
24.5
Healthy weight
Category
Healthy weight
Healthy weight range
56.7 kg – 76.3 kg
- Height used
- 175 cm
- Weight used
- 75 kg
- BMI
- 24.5 kg/m²
- WHO category
- Healthy weight
- Within the healthy range
- Yes
How this was calculated
- 1.Convert height to metres: 175 cm = 1.75 m.
- 2.Square the height: 1.75² = 3.063.
- 3.BMI = 75 ÷ 3.063 = 24.5.
- 4.24.5 sits in the healthy weight band (healthy is 18.5–24.9).
BMI is a population screening tool. It does not distinguish muscle from fat, so athletes often read as overweight while older adults can read as healthy with excess fat.
How the bmi calculation works
Body mass index compares weight to the square of height, giving a single number that can be compared across different body sizes. The World Health Organization uses fixed bands: under 18.5 is underweight, 18.5–24.9 healthy, 25–29.9 overweight and 30 or above obese.
It is a screening tool, not a diagnosis. It says nothing about muscle mass, bone density, body shape or where fat is stored, all of which matter for health. Waist circumference and body fat percentage give a fuller picture — the body fat calculator estimates that from tape measurements.
Worked example
175 cm and 75 kg.
- →Height in metres = 1.75
- →1.75² = 3.0625
- →BMI = 75 ÷ 3.0625
Answer: 24.5 — at the top of the healthy range.
BMI FAQs
What is a healthy BMI?
For most adults, 18.5 to 24.9 is considered healthy. The same range applies to men and women, though it is interpreted differently for children and during pregnancy.
Is BMI accurate for athletes?
Not really. Muscle is denser than fat, so muscular people often score 25–30 without excess fat. Use body fat percentage or waist measurement alongside BMI.
Does BMI work for children?
Not with adult bands. Children are assessed with age- and sex-specific percentile charts, which a paediatrician should interpret.
BMI Calculator is part of the health calculators collection on Calcora, alongside 7 other tools. Results are calculated in your browser and are for information only — see our disclaimer.
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