I think that you may be using the tape incorrectly. There is no way that Apache weighs 2,237.4lbs. That would be like draft horse size. I have a formula for calculating weight, in pounds, but it could be converted to kg though. If you are interested in the formula, I will gladly post it on here, with instructions on where to measure and what to measure for it. As for the height part of the weight tape, personally, I would just measure with a regular soft measuring tape, in inches and measure to the highest part of their withers, then convert it to hands myself. Also make sure that when you measure for height, that the horse is standing square and on level ground.