Minecraft wiki entry for Horses, associated text: The internal value for jump strength for horses ranges from 0.4 to 1.0, which turns out to be approximately 1.08 to 5.29 blocks (contrary to the popular belief 1.0 to 5.0 blocks). A device to measure this can be quite simple: build walls of increasing heights parallel to each other, 3 blocks apart. To test horse jump strength, simply jump over the shortest wall to arrive at the next wall, and continue jumping until you can no longer jump. The last wall you were able to jump over indicates your horses maximum jump strength. Slabs and snow layers can be used to create non-full block increments. To convert a horse's internal jump strength to blocks, take the internal value to the power of 1.7 and multiple the result by 5.293. Blocks = (Internal value)^1.7 * 5.293