Siding Calculator
Find how many squares of siding a wall and its gable need, less doors and windows.
Change the values and press Calculate to work out your own figures.
Enter the wall's width and height and the gable.
Show the working
- squares = (wall + gable − openings) ÷ 100
How to use it
Enter the wall's width and height and the gable.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
squares = (width × height + width × gable height ÷ 2 − openings) ÷ 100
Squares
A square of siding covers 100 sq ft. Order whole squares or cartons and keep a few spare pieces for repairs.
Questions
How many squares for a 40 × 12 ft wall?
4.8 squares; buy 5.
Formulas
squares = (width × height + width × gable height ÷ 2 − openings) ÷ 100
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.