Use Fat Free Mass when you need to compute fat-free body mass in kilograms from body weight and body fat percentage. Enter Body weight kg and Body fat percent using the definitions and units below so the result can be reproduced.

Body weight kg

A finite measured or assumed value.

Body fat percent

A finite measured or assumed value from 0 through 100.

The published tool contract uses this rule: Compute fat-free body mass in kilograms from body weight and body fat percentage.^[1]

Fat free mass kg

The calculated fat free mass kg in kg.

A ratio or percentage can conceal the scale of its numerator and denominator and becomes sensitive to measurement error when the denominator is small. Body fat percent must remain between 0 and 100.

Retain the original Body weight kg and Body fat percent values and their units alongside the result. Carcass Fat % is useful when you instead need to compute the dissectible fat mass percentage of a dressed carcass weight. LMA provides another view by helping you compute leaf mass per area LMA in grams per square metre as leaf dry mass divided by leaf area converted from square centimetres.

• Carcass Fat %

  Compute the dissectible fat mass percentage of a dressed carcass weight.

• LMA

  Compute leaf mass per area LMA in grams per square metre as leaf dry mass divided by leaf area converted from square centimetres.

• Red Cell Mass mL

  Compute the red cell mass as blood volume times the hematocrit fraction.