Calculating The Amount Of Siding Material Required For Your Home - Part 1

measuring walls for sidingThe following calculation information can be used for any siding material including vinyl, aluminum, fiber cement board and wood. Trims for wood siding are somewhat different than those used for man-made materials.

Figure 1a - Insulated vinyl siding

Many manufacturer's sell siding by the square. A square is a construction term which is the equivalent of 100 square feet of coverage.

For simplicity we are using square feet. If the siding you have chosen is sold by the square, then divide your total square feet by 100 to determine how many squares you will require.

It is impossible to calculate the requirements of sheets of siding, trims and moldings by the piece as manufacturer's have not standardized on lengths.

It is wise to purchase 10% more product than you require as there will be some waste. You should also be aware that many siding manufacturer's have die lots and it is important, if the siding you have chosen has a die lot number that all of the siding is from the same die lot. Color variations are generally not noticeable unless individual pieces of siding are placed side by side or above one another.

The first part of the measuring exercise is to determine how many square feet of siding material you will need. This requires breaking the exterior area of the home to be sided into rectangles and 90 degree triangles, as shown in Figure 1, 2, 3 and 4.


Figure 1 - Measuring walls for siding

Wall 1 = Width X Height =

Measuring a plain roof gable end for sidingWall 2 = Width X Height =

Wall 3 = Width X Height =

Wall 4 = Width X Height =

Total For All Walls =

Note: Depending on the shape of your home you may have more than 4 walls. Just add the additional walls to the total using the same calculation of "width X height".


The area of the roof is a little more complex. First because of the number of variations to roof shapes and second because you are generally dealing with triangles rather than rectangles.

Plain Gable Roof End:

Figure 2 - Measuring a plain roof gable end for siding

Gable 1 = Half of Width X Height =

Gable 2 = Half of Width X Height =

Total For All Gables =


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Sorry I don't have a good answer for you. When working on something like your house that has some problems it all depends on the skill and experience of the installers. I'd suggest you stop the job at least for a while and try to work something out satisfactory to both of you. It's probably to late now but when I see something like this I suggest to use vinyl siding because it hides defects on the walls much better.

Ogdensburg home rehabilitation program gears up for phase two, on schedule  —
Some homes will receive extensive and visible rehabilitation, including the installation of vinyl siding, roofing and windows. Other homes won't have an obvious exterior update but will have new furnaces or flooring put in.

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  • Avatar Sam R How much does siding cost?
    Mar 03, 2011 by Sam R | Posted in Decorating & Remodeling

    Sooo my parents and i just moved into an old house but it was unfortunately updated with vinyl siding, they are considering replacing it with real wood and are wondering about how much it would cost
    the house is just a little over 5,100 square feet and is located in the Berkshires if that matters at all

    • Siding cost on a 5,100 square foot home (that's over 2.5 times larger than the national average home size) SHORT ANSWER: $25k to $35k Installed (materials and labor) - that's the National Industry Average cost for siding …ou are very smart for asking questions! Do your research & ask lots of questions and your parents could end up saving a ton of money... I'm sure you could come up with something much better to spend that money on. :)

  • Avatar Kristi How do I estimate the amount of wood needed for a 32' x 24' shed/carport?
    Jan 26, 2014 by Kristi | Posted in Do It Yourself (DIY)

    I have been searching the web trying to find a material calculator, but can't find anything. Basically, we are planning on building a 12' x 24' shed with a carport attached to the front side. The carport would be 20' x 24'. Any help would be greatly appreciated!

    • One thing you can do is go to a store like 84 Lumber, Carter Lumber, or Menards (if you have any of those in your area) and pick out one of their "pre packaged" plans. I can pretty much guarantee you they would …re having it delivered because they will deliver some pieces of lumber that are junk and you will have to return. Its easier to return a couple pieces rather than get toward the end of something and need one or two more.