- Enter body weight. Use kilograms.
- Enter height. Use centimeters without shoes.
- Read the BMI value. The number is rounded to one decimal place.
- Review the category. Adult categories are screening ranges, not diagnoses.
- Use context. Consider body composition, waist measures, medical history, and clinician advice.
Daily Body Mass Index Calculator
Calculate adult body mass index (BMI) from weight and height and classify the result using standard adult screening categories. BMI is a quick size-for-height measure that can support population screening and routine health discussions.
BMI does not directly measure body fat, muscle mass, fat distribution, or individual health status. Athletes, older adults, pregnant people, and people with certain medical conditions may need additional assessment.
Daily inputs
kg
cm
Result
—
Calculated result
Category—
Healthy-range weight—
Height in meters—
BMI = weight (kg) ÷ height² (m²)
Height in centimeters is divided by 100 before squaring. Adult screening categories are under 18.5, 18.5–24.9, 25.0–29.9, and 30.0 or higher.
What the result means
BMI summarizes weight relative to height and places the result in an adult screening category.
BMI is not a diagnosis and should be interpreted with other health information.
Given: Weight 70 kg and height 175 cm.
Calculation: Height = 1.75 m. BMI = 70 ÷ (1.75²) = 22.86.
Result: BMI 22.9, within the healthy-weight screening range.
Why does BMI use height squared?
Squaring height provides a practical scaling relationship between body mass and stature for adult screening.
Can muscular people have a high BMI?
Yes. BMI cannot distinguish muscle from fat, so muscular people may be classified higher despite low body fat.
Does the category apply to children?
No. Children and teens use age- and sex-specific BMI percentiles.
Should height be entered in shoes?
No. Use standing height without shoes for a more consistent result.
What else should be reviewed with BMI?
Waist circumference, body composition, blood pressure, laboratory results, and overall health history may add context.