Calculate body mass index using height and weight with a simple category result.
Calculate body mass index using height and weight with a simple category result.
BMI is a screening number, not a diagnosis.
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Standard mathematical and financial formulation used for verified calculation.
Estimate healthy body weight reference ranges using Devine, Robinson, Miller, and Hamwi formulas.
Estimate daily calories your body burns at rest using the Mifflin-St Jeor equation.
Estimate daily maintenance calories by combining BMR with your activity level.
Estimate daily calories for maintaining, losing, or gaining weight.
For most adults, a BMI from 18.5 to 24.9 is commonly considered the normal range.
No. BMI is a screening metric and does not directly measure muscle, fat distribution, or medical risk.
Yes. People with high muscle mass can have a higher BMI without having excess body fat.
Body Mass Index (BMI) is a standardized screening metric that evaluates body weight in relation to height, calculated as weight in kilograms divided by height in meters squared (kg/m²). Standardized by the World Health Organization (WHO), it groups adults into broad epidemiological weight categories.
Standard Adult Classification: Underweight (< 18.5), Normal weight (18.5 – 24.9), Overweight (25.0 – 29.9), and Obesity (≥ 30.0). For Asian populations, several regional public health guidelines consider values above 23 as increased risk and above 25 as high risk due to differing body fat distribution profiles.
Screening Indicator, Not Diagnosis: BMI serves as an accessible initial risk screening indicator. It does not measure body fat percentage, subcutaneous versus visceral adiposity, bone density, or metabolic indicators such as fasting glucose, lipid profiles, or blood pressure.
Demographic Variations: Highly trained individuals and athletes with elevated skeletal muscle mass often index in the 'overweight' range despite minimal adiposity. Conversely, elderly adults experiencing muscle loss (sarcopenia) may reflect a 'normal' BMI despite elevated relative fat mass. BMI is also not calibrated for children, adolescents, or during pregnancy.