Online BMI Calculator

Compute your body mass index with Wolfram|Alpha

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Simple, informative BMI computation

Wolfram|Alpha can quickly and easily compute your body mass index, a measurement of body fat based on height and weight. Calculations can take your gender into account and produce charts showing where your BMI falls in relation to the normal range for adults.

Body mass index calculation results, formulas and graphs

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Tips for entering queries

Enter your queries using plain English. Your input can include complete details about your gender, height and weight, or you can add, remove and modify values and parameters using a simple form interface. Given a BMI and height, you can also compute a target weight to meet a body mass goal.

Body mass index basics

A body mass index is typically computed from a person's weight in kilograms divided by the square of their height in meters.

Higher BMI values may indicate higher levels of body fat, which can be associated with various metabolic conditions and diseases; very low BMI values can indicate underweight, which may be associated with bone loss, malnutrition and other conditions. BMI values calculated with this formula are not appropriate for children, and also may not be accurate for certain adults, including bodybuilders, pregnant women or people shorter than 150 cm or taller than 190 cm (after rounding, 4'11" and 6'3", respectively).