How do I triple a recipe for cinnamon rolls, especially when it involves yeast? I want to use the right amount of yeast.
Just triple the amount of each ingredient, including the yeast. If you're doing a really long rise (like overnight or longer), you might not want to use as much yeast, but for a sweet dough, using 3x the original should be just fine.
Weight based measurements will be far more accurate than volume based measurements particularly wrt salt. So I would weigh all the ingredients of my original recipe and then triple them based on weight rather than volume.
I agree with the above answers. All I might add is this: when proofing dough, use a container that is more like 4X the size of a regular batch. You want to give more dough more room.