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How to Measure and Calculate Residential Square Footage

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Using Your Measurements to Calculate Square Footage

Square Footage Calculations
Most calculations will involve squares, rectangles and triangles.
© Janet Wickell

Squares and Rectangles

Multiply length times width to find the number of square feet in a square or rectangular room. Remember to calculate unfinished areas and deduct them from the total.

To calculate the area of a triangle, multiply its base length by its height and divide that figure by two.

  1. Make a Sketch of the Home
  2. Measuring Guidelines for Special Circumstances
  3. Using Your Measurements to Calculate Square Footage
  4. Calculating Combination Shapes
  5. Calculating Circular Shapes and Octagons

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