All free tools
HeizerDeskFree Tools
HeizerDesk Siding Calculator
Measure the perimeter of the house and the wall height, subtract the doors and windows, and this returns net siding area, how many squares that is, and how many boxes of vinyl siding to order. A free siding calculator you can use on the job: nothing to install, nothing to register.
Your numbers
Result
Siding squares
14.5
squares
- Vinyl siding boxesAt 2 squares per box
- 8boxes
- Net siding area
- 1,320sq ft
- Order area, incl. waste
- 1,452sq ft
- Rectangular wall area
- 1,260sq ft
- Gable area
- 240sq ft
How this is calculated
- Wall area = perimeter × wall height.
- Gable area = ½ × gable width × gable rise, for each gable. A gable is a triangle, so it is half of the rectangle that would contain it.
- Net area = wall + gables − doors and windows.
- Order area = net × (1 + waste %).
- Squares = order area ÷ 100. Siding, like roofing, is sold by the square.
- Boxes = squares ÷ 2, rounded up. A standard box of vinyl siding covers two squares.
Before you order
- Only subtract openings you are actually leaving bare. Many crews deliberately do not deduct small windows, because the offcuts around them are unusable anyway.
- Step waste to 15% for a house with a lot of corners, or if you are running a pattern that has to line up.
- Trim, corner posts, J-channel, starter strip and soffit are separate and not included here.