How to Calculate Fascia and Soffit
What is Fascia and Soffit?
Fascia and Soffit Calculator helps contractors and tradespeople accurately size, spec, and estimate materials and systems.
Formula
Fascia LF = Perimeter of Roof; Soffit SF = Eave Width × Perimeter
Step-by-Step Guide
- 1Measure roof perimeter for fascia, eave projection for soffit
- 2Apply the formula using your project measurements
- 3Add required safety factors or waste allowances per code
Worked Examples
Input
150 lf perimeter, 18 inch eave
Result
Fascia = 150 lf; Soffit = 150 × 1.5 = 225 sf
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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