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    CTBRIAN's Avatar
    CTBRIAN Posts: 1, Reputation: 1
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    #1

    Jun 4, 2008, 09:25 AM
    Calculating square footage with exact measurements
    How do I multiply two measurements of feet and inches to get exact square footage?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Jun 4, 2008, 09:44 AM
    Example: 5' 12", 6' 1" (picked stupid easy numbers)

    1) Multiple the feet terms: 5 * 6 = 30 sqft
    2) Multiply the inch terms: 12 * 1 = 12 sq inches
    3) Convert inches to feet by the conversion 12"/1' X 12"/1' = 144 sqin/1sqft
    4) 12 sqin * 1sqft/144 sq in; check dimensionally so it works out in sq ft.
    5) Add 30 sqft + 12/144 sqft

    6) Get it in the form of 30.xyz or whatever sqft or simplify the fraction

    Yep. Wrong answer.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Jun 4, 2008, 09:48 AM
    Easiest way is to convert the two measurements into inches, multiply them together, then divide by 144 sq in/sq ft to get it into square feet.

    Example: consider a room that is 10'5" long by 8'9" wide. This converts to:

    length: 10 ft * 12 in/ft + 5 = 125 inches.
    width: 8*12+9 = 105 inches

    Area = length * width = 125 inches * 105 inches = 13125 sq inches.

    13125 sq inches/144 = 91.14 sq ft.

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