A proposal of an adapted Fulton's K of condition factor is proposed for goat breeds. The study included twenty five (25) adult animals of Catalan and forty-one (41) of Gwembe goat breeds, from which thoracic perimeters and body weights were obtained. The suggested formula (W/T4), where W is the whole body weight expressed in kilograms and T is the thoracic perimeter expressed in metres, seems to be an easy-to-measure condition factor that is quite useful for within-breed individual evaluation.