Roachmeat posted...
'No'
Similar to driving an automatic transmission, I somewhat want to know how but then life throws something at me and I forget later that I wanted to learn it.
There isn't really that much to learn. Memorize half a dozen prefixes that you probably already know because they're just Latin for the numbers in question (and even then, kilo-, centi- and milli- are the only really commonly used ones unless you're doing science that deals with micro- and nano-), figure out how to divide/multiply stuff by 10, and you've got pretty much the whole system down. All that actually requires learning is getting a sense of the magnitude of each unit and learning how to convert from Imperial. Even for those conversions, rough ballparks of 1 L=1 q, 1 kg=2 lb, 1 m = 1 yard, 1 in = 2.5 cm, and 1 mi = 1.5 km will get you close enough for colloquial use. Temperature's still messy, unfortunately (2C+32=F will get you close, but that's only marginally less awkward than 1.8C+32=F).