Seems to me that would be about right. Okay, add another half inch. At a holiday table things are going to get crowded and shoved around. These will protect glass and fine wood tables. I like the idea, they will be in addition to place mats so should mix and match with the mats. And you might want to add some hot pot holders to protect the tables from heat. Make them fatter than the place mats. I've found that if I keep adding insulation to them it will be enough if I can hold a hot dish in my hands with only the heat protectors under the hot pot.