How to Measure For New Siding

How do I calculate how much siding I need?

Start by measuring the height and width of each wall of the building. Multiply each length and height measurement to find the square footage of each wall, then add them together to find the total square footage. Divide the total by 100 to find the number of squares of vinyl siding to order.
A “square of siding” is a measurement of siding material. One square of siding is sufficient to cover 100 square feet of wall space. A square of siding is thus sufficient to cover a 10-foot by 10-foot section of exterior wall.

How many square feet does a box of siding cover?

200 square feet
A box of vinyl siding contains two “squares.” A square in construction lingo equals 100 square feet, so a box of vinyl siding will cover 200 square feet.

 Follow these steps for calculations you’ll use to learn how to measure for wood siding:

  1. Measure height and width of each side. For each side, multiply height times width to get the total square feet.
  2. Measure other areas not included in the sides, such as gables, dormers and more. For triangle areas, measure from the base of the triangle to the top and multiply that number by half of the base length.
  3. Measure the height and width of each window, door and other areas not covered by siding. When in doubt, account for 15 square feet for windows and 20 square feet for doors.
  4. Add together the square footage you calculated for the sides of your home and the additional areas.
  5. Subtract the uncovered areas’ square footage from the total amount you calculated in step four.
  6. Divide this number by 100 to get the number of squares of siding you will need to order.

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