Originally Posted by RPCookin
A "mug" isn't any cooking measure that I ever heard of. I've seen 6 ounce mugs and 16 ounce mugs (I even have a beer mug that's 20 ounces). If you use cups for the water, why not for the rice too?
But it doesn't matter what size your "mug" is. Mine hold a more or less standard 7 ounces.
The point is that you are using twice as much water by volume as rice so it doesn't matter if you use mugs, egg cups or 5 gallon jerry cans.
Anyway, we don't use standard measuring cups for "weighing" ingredients over here. We use scales for dry goods and fats, and measuring jugs for liquids. Makes life so much easier, particularly with baking.