How to Calculate Siding
What is Siding?
Siding Coverage Calculator helps contractors and tradespeople accurately size, spec, and estimate materials and systems.
Formula
Squares = Exterior Area / 100 sf × 1.10 (10% waste)
Step-by-Step Guide
- 1Measure all exterior wall surfaces, subtract openings, add waste
- 2Apply the formula using your project measurements
- 3Add required safety factors or waste allowances per code
Worked Examples
Input
1500 sf exterior, 200 sf windows/doors
Result
Squares = (1500-200)/100 × 1.10 = 14.3 squares
Common Mistakes to Avoid
- ✕Not applying code-required safety factors or derating
- ✕Forgetting to account for waste and cut losses in material estimates
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