let other ppl define their standards and I use 'em. But
  personally? I measure distances by what's around me; landmarks
  and things. I measure cooking by sight or by certain caps of
  bottles if I must measure and whatnot. I can extraordinarily
  precise when I *must* measure using standard measurements and
  honestly, i hate being excessively precise because it just takes
  over.

  I prefer rounding. Round up. Round down. More or less. Just
  about. "Here, if you see this landmark, YOU'VE GONE TOO FAR" -
  that sort of thing. Also, my SHOE happens to be _exactly_ one US
  FOOT - which is EXTREMELY handy when I'm in them.

  But if my foot wasn't, I'd still count feet by feet - *my feet*.
  Someone else can go get a measuring tape if they want to.