Originally Posted by SoSmellyAir

Since it does not seem to have been pointed out yet, the OP should recognize that, whichever proper method is used to size the chain, there is a narrow range of chain lengths -- rather than only a single chain length -- which works for a given drivetrain setup. So I would err on the side of slightly longer, and if there is enough slack in big/big and too much slack in small/small, remove a link.