The weight of your horse is the basic guide to calculating balanced rations, the single most necessary factor for sound health and good peformance.

To estimate your horse's weight, measure its girth and length in either inches or centimeters.

Girth is the circumference of the horse's body measured from about 4" behind its front legs. 

Length is the length of the horse's body as measured in a straight line from the point of the shoulder to the buttocks.