2) If you only have numbers, GUESSTIMATE! 13X12X29 is close to
  15x10x30 - not exact but close. 15x10=150x30=450 cubic inches..
  or 12x12x30 - that's close too. 12x12=144*30= 144+144=288 + 144
  = 432 cubic inches. Again,, close enough. I have no idea what
  the 'right' answer is because most of the time, the perfect
  answer doesn't matter. unless the size of the *gap* matters. "

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