13.3hh now. how tall when grown?

How big are his parents?

Have you tried either of the tests - back of knee to point of fetlock in inches = height in hands

or string from point of fetlock to elbow, then invert string from elbow to above withers = approx. finishing point of withers.

I'm making a guess of 14.2 - 15hh based on height now, purely a guess based on how mine grew though :)
 
Measure his cannons (knee to coronet band) proves true for all our adult horses and a youngster we had.

The youngster at work born last May is about 14 hands now..god knows how big he'll be!!
 
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