Building & DIY

Vinyl Siding Calculator (Squares & Boxes)

Enter your wall lengths, height, and the area taken up by windows and doors, and it estimates the vinyl siding you need. You get squares and boxes plus the trim pieces like J-channel, starter strip, and corners.

How to use
  1. Enter the average wall length, wall height, and number of sides.
  2. Enter the total area of windows and doors to subtract.
Estimates only, allow for waste and confirm against local building codes and supplier specs.
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Common questions

How many square feet is a square of siding?

100 square feet. Siding is sold and estimated by the square, and a box usually covers two squares.

How much extra siding should I buy?

Plan for about 10 percent over the net wall area for cuts and waste. Steep gables and lots of openings push that higher.

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