Fascia board formula?
adjusted = (eave + rake) × (1 + waste%); estimatedBoards = ceil(adjusted ÷ boardLength).
A fascia board calculator estimates an order quantity from measured roof-edge runs.
**Sections mode:** enter each eave length and each rake/gable length. The tool sums eaves and rakes separately, then combines them.
**Total mode:** enter one linear-foot (or meter) total if you already measured everything.
Adjusted length = base × (1 + waste%). Calculated boards before rounding = adjusted ÷ board length. Estimated boards to order = ceil(calculated).
This is an aggregate linear-foot estimate — not a cut list. Individual runs may need cuts, joints, or corners, and leftover material may not always be reusable.
Optional cost uses your price per board or per linear foot. Board width/height does not change linear board count — match profile depth to your sub-fascia separately.
Concise answers for common searches — definitions, steps, and comparisons.
adjusted = (eave + rake) × (1 + waste%); estimatedBoards = ceil(adjusted ÷ boardLength).
Sum eave and rake fascia (or use a total), apply waste, then divide by stock board length and round up for an estimated order quantity.
Formula
base = Σ eave + Σ rake (or total); adjusted = base × (1 + waste%/100); calculatedBoards = adjusted ÷ boardLength; estimatedBoardsToOrder = ceil(calculatedBoards).Use feet or meters. Prefer eave + rake sections so totals stay auditable. Use total linear feet if you already summed everything.
Add each eave run and each rake/gable run. Use + Add section for multiple sides.
Pick 8, 10, 12, or 16 ft (or metric stock) — or enter the custom length on the label you will buy.
Enable waste for cuts and corners (often 5–10%), or set 0% for a pure geometric estimate.
Use the estimated whole boards to order. Expand How this was calculated to see eave, rake, waste, calculated boards before rounding, and leftover.
Input
Eaves 32 + 28 · Rakes 18 + 18 · waste 10% · boards 12 ftOutput
Base 96 ft · adjusted 105.6 ft · calculated 8.8 · estimated order 9 boards60 eave + 36 rake = 96. ×1.1 = 105.6. 105.6 ÷ 12 = 8.8 → ceil = 9 estimated boards.
Input
total 96 · waste off · board 12Output
8 calculated boards · 8 estimated to order96 ÷ 12 = 8.
Input
96 ft base · 10% · 8 ft boardsOutput
14 boards105.6 ÷ 8 = 13.2 → 14.
Common real-world scenarios where this tool saves time.
32+28 eaves and 18+18 rakes with 10% waste and 12 ft boards → 9 boards.
Enter 96 ft total when eaves and rakes are already summed.
Enable cost and enter $/board or $/LF for a materials-only estimate.
Step-by-step chains that connect related tools for common tasks.
Plan fascia with soffit, gutters, and roof area when reworking the eave line.
| Scenario | Adjusted ft | Boards |
|---|---|---|
| 96 ft · 0% waste | 96 | 8 |
| 96 ft · 10% waste | 105.6 | 9 |
| 96 ft · 10% · 8 ft boards | 105.6 | 14 |
| 96 ft · 10% · 16 ft boards | 105.6 | 7 |
Keeping them separate makes the takeoff easier to check on-site.
Recount if you switch from 12 ft to 16 ft stock — leftovers change.
Use the Soffit and Gutter calculators for the rest of the eave package.
Add every eave side (and rakes if needed). A rectangular house usually has more than one eave run.
Gable ends need sloping rake boards. Enter them as rake sections or include them in your total.
Fascia is ordered by length along the roof edge — not by roof area.
Not every perimeter segment needs fascia the same way. Measure the runs that actually get fascia boards.
Enter the stock length your supplier sells (often 8–16 ft). Changing length changes board count.
Corners, miters, and leftover stubs eat length. Keep a waste allowance unless you already padded the measurements.
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Sum eave and rake lengths (or enter a total), multiply by (1 + waste%), divide by stock board length, and round up for an estimated whole-board quantity. This is an aggregate linear-foot estimate — not a cut list for every section.
Measure each straight eave run and each sloping rake/gable run with a tape. Add bump-outs and returns as their own short sections when needed.
Yes, if those gable edges get fascia. Enter them as rake sections so they are not forgotten — and so they are not double-counted if already in a total.
For the worked example (96 ft base, 10% waste), adjusted length is 105.6 ft → 105.6 ÷ 12 = 8.8 calculated boards → estimate 9 boards to order. Your measurements replace the example, and section-level cuts can still change the real count.
Many simple roofs use about 5–10%. Use more for lots of corners, miters, or short returns. Set 0% if your field measurements already include extras.
Eave fascia is the horizontal board along the eaves (often behind the gutter). Rake fascia follows the sloping gable edge.
Yes — optionally enter price per board or per linear foot. The estimate is materials only, not labor or accessories.
No for linear takeoff. Width/height must match the sub-fascia and look you want, but board count comes from length ÷ stock board length.
Fascia calculator inputs stay in your browser — EverydayTools does not collect fascia calculator entries.
Planning estimate only — not a substitute for a professional roofing or carpentry takeoff.
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Reviewed on 2026-09-10.
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Examples only — replace with your measured eaves and rakes.
Horizontal runs along the eaves (where gutters usually hang).
Eave 1
Eave 2
Sloping gable/rake edges. Leave empty if you only need eave fascia.
Rake 1
Rake 2
Use the length printed on the boards you will buy — suppliers differ.
Estimating assumption — 5–10% is common for simple roofs; use more for many corners or miters.
Enter the price you see at the lumber yard or online. EverydayTools does not invent regional prices.