How to Calculate House Area in Squares

Square or Rectangular Rooms

• 1

  Use the tape measure to measure the length of the room. Example: 10 feet.

• 2

  Measure the width of the room. Example: 12 feet.

• 3

  Multiply the length of the room by the width to find the room's square footage. Example: 10 X 12 = 120 square feet.

Triangle Rooms

• 4

  Use a tape measure to measure the height of the triangle. Height is a figurative term -- in this case, measure the center point of the triangle to the center of the base of the triangle. Example: 9 feet.

• 5

  Measure the base of the triangle. Example: 12 feet.

• 6

  Multiply the height by the base and divide this number by two. Example: 9 x 12 = 108 / 2 = 54 square feet.

Circular Rooms

• 7

  Use a tape measure to measure the diameter of the circle. Example: 12 feet.

• 8

  Divide the diameter in half to get the radius of the circle. Example: 12 / 2 = 6 feet.

• 9

  Multiply pi by the radius squared. Example: 3.14 X 6 X 6 = 113.04 square feet.