What size horse would I need?

I'm not planning on buying a horse for quite a while, but I've always been curious as to how big a horse I would ride would need to be. I'm 6"7 and I weigh about 50 kilos (110lbs), and I was thinking it would have to be around 16hh? I've always ridden bigger horses as I'm quite tall. I'm definitely not getting a horse in the near future, I need to have a lot more money and experience for that, I'm just genuinely curious! Thanks :)