I did do some other project-related calculations before I succumbed to the Kidazzle ... finally took a measuring tape to the "swatch" I'd done for Cables After Whiskey based on the Elizabeth Zimmermann principle of just start knitting the darned sweater, measure gauge when you've done a decent amount of work, and if you're lucky the gauge will be good enough that you can just carry on. Well, gauge was off (I rather expected that) ... supposed to be 4.5 stitches per inch and I was getting 5 stitches per inch***. But I liked the density and drape of the fabric at 5 per, so instead of changing needle sizes I'll just restart with the numbers for the next size larger of the sweater (it's supposed to be oversized and while the ribbing slid over my hips with stretch to spare, it really should be looser to look right). So notes got noted and that yarn got pulled off the needles and rewound ready to begin the official version.
***Why does a mere 1/2 stitch difference matter? Because if one casts on 200 stitches for a sweater and works at 4.5 stitches per inch, that sucker will be 44.5 inches around the chest. At 5 stitches per inch it'll only be 40 inches around. Gauge determines size and while a half stitch doesn't seem like much when talking about a mere inch, when those inches get into multiples, those half stitches also multiply into a signficant difference. Normally one experiments with different needle sizes until one does "get gauge", but because I like how the knitting feels at the wrong stitch count and the fit of the swatch is only a little snugger than it should be, using the numbers for the next largest size will do the trick (I'll be casting on extra stitches which will compensate for the tighter gauge)