The first thing to pay attention to is how much weight your toilet can actually hold. There are standard toilets as well as more durable ones and wall mounted ones. When it comes to a standard toilet weight limit you’re looking at approximately 1000 pounds.
This is for toilets that are mounted directly onto the floor and have the support of a base that will allow them and the person sitting on them to be supported by the floor as well as the toilet itself. This toilet seat weight limit (depending on the specific type of toilet seat that you have) does not apply to toilet seats that are actually mounted to the wall. You can read full review of best toilet seat here