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1 A hand is equal to 4 inches or 10.2cms. 2  You should measure your horse from the point of the withers to the ground. 3  A horse that is 61 inches tall is 15.1 hands or 15 hands and 1 inch or 15.1hh. 4  This is calculated using (61/4 = 15.25); the .25 is the decimal equivalent of one quarter and a quarter of 4 = 1; so 15.1hh.
Weight Calculation. Another way to estimate a horse's weight is to use a regular tape measure-the kind that measures in inches-to measure a horse's girth and length. Then, you perform the following calculation: Heart girth X heart girth X length, divided by 330, + 50 = weight.eight Calculation. Another way to estimate a horse's weight is to use a regular tape measure-the kind that measures in inches-to measure a horse's girth and length. Then, you perform the following calculation: Heart girth X heart girth X length, divided by 330, + 50 = weight.