When you research the wide variety of poker chips available, you will also observe that there are different weights for each style of poker chip. They range from 9 grams right up to 13 grams. The question remains, just how much is the correct poker chip weight?
The real answer is, "What ever weight feels best to you." But most people aren't happy with that answer. Most people want to know what weight is correct. Again, the answer is a very non-committal "that depends".
Casino chips are a whole new ball game. The size and weight of the casino chip varies. One thing is for sure it is not 11.5 grams.
There are some differences in the weight of Las Vegas. The usual weight for the casino chip is 10 grams. As these chips are made of clay it is probably the weight of the material in a certain size of chip. You can also find 13 gram chips, but these are generally weighted with metal flakes.
If you really want to be specific the correct weight would probably be around 10 grams. However it is all about individual tastes. Perhaps the 10 gram weight is a tad light for you and you want to play with the 11.5 gram or even the 13 gram chips.
Whatever you choose, make sure it's something that your home-game friends will be happy playing with for a long time because a happy player is a loose player.