Health calculators are informational and are not medical advice.
Beginner guide
Calculate BMI with kg and cm
This BMI calculator uses the most common body mass index formula: weight in kilograms divided by height in meters squared. If you need a BMI calculator that works with kg and cm, enter your height and weight directly in the fields above.
The result gives your BMI number, a general adult category, and a healthy weight range for the height you entered.
- Enter height in centimeters.
- Enter weight in kilograms.
- Compare the BMI result with the adult BMI chart below.
BMI chart and normal range
The BMI chart groups results into underweight, normal, overweight, and obesity ranges. A common healthy BMI range for adults is 18.5 to 24.9, although local clinical guidance can use slightly different wording or cutoffs.
BMI is useful for quick checks like 'what is my BMI' or 'check BMI', but it should not be the only measure used for health decisions.
BMI for men, women, and age
A BMI calculator for men and a BMI calculator for women use the same adult BMI formula. The difference is not the equation, but how the result may be interpreted alongside muscle mass, waist size, pregnancy, age, and medical context.
For children and teens, BMI by age is different from adult BMI. Pediatric BMI is usually checked against age- and sex-specific percentile charts rather than the adult ranges shown here.
When BMI can be misleading
BMI does not separate fat, muscle, bone, and water. Athletes, older adults, pregnant people, and people with unusual body composition may need other measures in addition to BMI.
Use this page as a fast BMI checker or body mass index calculator, then talk with a qualified professional if the result affects medical, diet, or training decisions.
Formula
BMI formula: BMI = weight in kilograms / height in meters squared. For example, 72 kg and 1.75 m gives 72 / (1.75 x 1.75).
Example
A person who is 175 cm and 72 kg has a BMI of about 23.5, which falls in the general adult normal range.
Result notes
- Results are estimates based on the values you enter.
- Calculators with schedules show how values change over time.
- For financial, health, or construction decisions, compare these estimates with professional advice when needed.
Frequently asked questions
How do I calculate BMI?
Enter height in centimeters and weight in kilograms. The calculator converts height to meters and applies the BMI formula: kg divided by meters squared.
Is this BMI calculator for men and women?
Yes. The adult BMI formula is the same for men and women, but health interpretation can vary by body composition, age, pregnancy, and medical history.
Does age change BMI?
Adult BMI itself is calculated from height and weight. For children and teenagers, BMI is usually interpreted with age- and sex-specific growth charts.
Is BMI a diagnosis?
No. BMI is a screening estimate and does not measure body fat directly.
Can athletes have a high BMI?
Yes. Higher muscle mass can raise BMI without indicating the same health risk.
Which units does this use?
This version is a BMI calculator in kg and cm. Convert height to centimeters and weight to kilograms before entering values.