Kaloretta

BMI Calculator

Enter your height and weight to see your body mass index, which WHO category it falls into, and what a healthy weight range looks like for your height.

Body parameters
Height
Weight

BMI doesn't distinguish muscle from fat and doesn't account for sex or age: athletes often fall into the overweight zone. Use it as a screening, not a diagnosis.

Your BMI

24.5kg/m² · normal

Normal weight for height 175 cm
57–76 kg

Your weight is in the normal range for this height. To maintain it, follow your maintenance calorie target — the calorie calculator computes it.

The calculator will factor in gender, age, and activity to suggest your calorie and macro targets.

What BMI is and why it matters

Body mass index (BMI) is your weight divided by the square of your height. It is the quickest way to check whether your weight fits your height: one number instead of a page of tables. The idea goes back to the Belgian statistician Adolphe Quetelet in the 19th century; today’s cut-offs (18.5–24.9 for a healthy weight) come from the World Health Organization.

BMI works well for most adults, but it is a screening tool, not a diagnosis. It doesn’t know how much of your weight is muscle, fat or water. If you train a lot, waist circumference and body composition tell you more than BMI alone.

WHO BMI categories for adults

Underweightbelow 18.5 kg/m²
Healthy weight18.5–24.9 kg/m²
Overweight25–29.9 kg/m²
Obesity (classes I–III)30 and above kg/m²

What to do with your result

  • Healthy range: keep your weight steady by eating around your maintenance calories and getting at least 150 minutes of moderate activity a week.
  • Above 25: aim for a moderate deficit of about 15% plus strength training twice a week, so you lose fat and keep muscle.
  • Below 18.5: a gradual surplus of 10–15%, and see a doctor if you are losing weight without trying.

The result is an estimate for healthy adults. During pregnancy or breastfeeding, with an eating disorder or a chronic condition, interpret your weight together with a doctor.

FAQ

What is a healthy BMI?

For adults, the World Health Organization defines a BMI of 18.5 to 24.9 as the healthy range. Below 18.5 counts as underweight, 25 to 29.9 as overweight and 30 or more as obesity.

How is BMI calculated?

BMI is your weight in kilograms divided by your height in meters squared. For example, 70 kg at 1.75 m gives 70 / (1.75 × 1.75) ≈ 22.9.

Is BMI accurate for athletes?

Not always. BMI cannot tell muscle from fat, so muscular people often land in the "overweight" band while being lean. Waist circumference or a body composition measurement gives a better picture.

Does BMI work for children and teenagers?

No. Under 18, BMI has to be compared with age- and sex-specific growth charts (percentiles). This calculator uses the adult cut-offs only.

My BMI is over 25. What should I do?

Start with your calorie needs: a moderate deficit of about 15% below maintenance, combined with strength training twice a week, helps you lose fat while keeping muscle. Use the calorie calculator to get your numbers.