I'm talking about the BicycleTutor method shown in this video:
http://bicycletutor.com/calculate-chain-length/

Does it work? I'm essentially done with a build, but my small chainring for a triple has not yet arrived. I need to have the bike rolling tomorrow afternoon due to the fact that I'm traveling abroad for a bit and need it completed. I also want to be able to use the same chain when I get and install the small ring. If this method of measuring and cutting is accurate, it should allow for the chain to work even with the new ring, right?

Thanks.