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About Soffit & Fascia Calculator
Calculate total soffit surface area, fascia linear footage, panel counts, and board quantities with custom waste allowances for roof eaves.
Inputs and calculations stay in your browser and require no signup.
How the calculation works
Planning calculation
Soffit area = eave length × soffit depth; Soffit area with waste = soffit area × (1 + waste% / 100); Soffit pieces = ceil(area with waste ÷ panel coverage); Fascia length with waste = eave length × (1 + waste% / 100); Fascia boards = ceil(length with waste ÷ board length).
How to use this calculator
- 1Enter measured project dimensions and quantities.
- 2Adjust material, spacing, waste or density assumptions to match the project.
- 3Review the live planning quantities.
- 4Round purchasing quantities appropriately and confirm field conditions.
Understanding the result
Soffit pieces and fascia boards round up to the next whole piece to account for standard supplier units and end-cuts.
Results use the units shown beside each field and output.
Important limitations
- Estimates straight eave runs only; roof geometry, gables, hip returns, and rake boards require separate takeoffs.
- Manufacturer panel dimensions, vented vs solid exposure, and seam overlaps may alter piece requirements.
- Confirm physical field measurements and local building code ventilation requirements before purchasing.
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Frequently asked questions
How do you calculate soffit area?
Multiply the total linear length of the eaves by the soffit depth (overhang width from the wall to the fascia board).
How much waste should I add for soffit and fascia?
A 10% to 15% waste factor is typical to account for miter cuts at corners, seam overlapping, and offcuts.
Does this include gable overhangs (rakes)?
No. Gable rakes slope with the roof pitch and should be calculated separately and added to the total run.
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