autozone can usually look it up for you, if your stock call them and see, I always buy a couple jugs pure antifreeze and if that's not enough start missing water in
Used to be any gas service station or parts store had a chart. As far as I know there are no longer any gas service stations left. But you can buy lotto tickets and beer! Not sure if the parts store employees even know what a radiator chart is either.
Doesn't the owner's manual or factory service manual have this information? I'm guessing you don't have either one.