There are no guarantees when it comes to the size of a Savannah cat. The heritage of the Savannah cat is both the very tall Serval and the normal-sized domestic cat, therefore the kittens could end up close to either size. The extremely tall kittens occasionally produced started out as average weight and size kittens. They do not exhibit tell-tale signs of how big they will be often until they are three months or older.
The later generation Savannah is similar in size to a domestic cat, which can have quite a range from small 7 lb petite cats to large 18 lb bruisers.