Siding Calculator
The Easy to use Siding Calculator for Your Project
Whether you are planning a DIY renovation or managing a professional building crew, using this siding calculator is the most effective way to determine how much siding you need. Proper planning ensures you buy the right amount of materials without overspending or running short mid-project.
The calculator takes your coverage dimensions, then converts it to square feet coverage of your new add-on space. This estimates for you the number of decking material boards needed to cover that area. The calculator will also convert the pieces into the basic selling unit of the dassoXTR materials. If you have your joist spacing, your result will include the types, and the count accessories, down to the number of screws you needed.
Understanding Surface Area and Measurements
To get an accurate estimate, you must first measure the width and height of every exterior wall.
- Walls: Calculate the surface area of each rectangular wall by multiplying the width and height.
- Gables: For any gable section, measure the base width and the height from the base to the roof peak. The total area for a gable is
.
- Total Surface Area: Add the area of all walls and gables to find the total area of the structure.
Accounting for Doors and Windows
A common mistake in a siding project is forgetting to subtract "uncovered" spaces. You must measure the width and height of all windows and doors.
- Subtract the total square footage of these doors and windows from your initial wall calculations.
- This gives you the net square footage that will actually be covered with siding.
Calculating Materials and Waste
Siding is typically measured and sold in squares.
- One "square" of siding is equal to 100 square feet.
- Waste Factor: Professionals always include a waste allowance—usually 10% to 15%—for trim, overlapping, and cutting errors.
- To find your final total square footage, take your net area and multiply it by your waste factor (e.g.,
for 10% waste).
Quick Summary for Your Checklist
- Measure: Record the height and width of all walls and gables.
- Subtract: Deduct the area of windows and doors.
- Convert: Divide your total square footage by 100 to get the number of squares.
- Add Waste: Include 10% extra for trim and waste.
By using these calculators and formulas, you can confidently choose your siding material and start your project with the right amount of ft (feet) and square footage in mind.