Calculator Inputs
Plotly Graph
This graph compares base and waste-adjusted linear quantities. It uses your submitted result when available, otherwise it shows the default example.
Formula Used
1) Fascia Base Length
Fascia Base = (Building Length × Fascia Length-Side Count) + (Building Width × Fascia Width-Side Count) + (Corner Count × Corner Allowance) − Fascia Deductions
2) Soffit Base Length
Soffit Base = (Building Length × Soffit Length-Side Count) + (Building Width × Soffit Width-Side Count) + (Corner Count × Corner Allowance) − Soffit Deductions
3) Waste Adjustment
Adjusted Length = Base Length × (1 + Waste % ÷ 100)
4) Soffit Area
Soffit Area = Soffit Base Length × Overhang Depth
5) Stock Pieces
Pieces Required = Ceiling(Adjusted Length ÷ Stock Length)
6) Cost
Total Cost = (Adjusted Fascia Length × Fascia Unit Cost) + (Adjusted Soffit Length × Soffit Unit Cost)
How to Use This Calculator
- Enter one consistent unit, either feet or meters.
- Input building length and width for the rectangular structure.
- Select how many length and width sides receive fascia.
- Select how many sides receive soffit coverage.
- Enter overhang depth to estimate soffit area.
- Add optional corner allowance for miters, returns, or wraps.
- Subtract deductions where trim is not needed.
- Apply a waste percentage for cuts, defects, and offcuts.
- Enter stock piece length and unit costs.
- Press calculate to view totals, graph, and export options.
Example Data Table
| Project | Adjusted Fascia | Adjusted Soffit | Adjusted Soffit Area | Fascia Pieces | Soffit Pieces | Total Cost |
|---|---|---|---|---|---|---|
| Garage Box Eave | 95.90 ft | 95.90 ft | 95.90 ft2 | 8 | 8 | $786.41 |
| Porch Extension | 84.10 ft | 84.65 ft | 105.81 ft2 | 8 | 8 | $767.46 |
| Small House Perimeter | 150.70 ft | 150.70 ft | 226.05 ft2 | 13 | 13 | $1,311.09 |
Frequently Asked Questions
1) What does this calculator estimate?
It estimates fascia length, soffit length, soffit area, stock pieces, and material cost for rectangular building edges. It also applies waste and optional deductions so you can order more accurately.
2) Should I enter feet or meters?
Either works. Use one unit consistently for every linear input, including building dimensions, overhang depth, deductions, corner allowance, and stock length. Mixed units will distort the result.
3) Why are fascia and soffit side counts separate?
Some buildings need fascia on more edges than soffit, or vice versa. Separate side counts let you model open gables, porch additions, or sections where one trim type stops earlier.
4) What is corner allowance used for?
Corner allowance adds extra length for miters, folded metal, wraps, returns, and trimming losses near corners. It is optional, but it helps create more realistic ordering totals.
5) What waste percentage should I choose?
Many installers start near 5% to 12%, then adjust for complexity. Higher waste fits many corners, short offcuts, premium finishes, or jobs with difficult access and more cutting.
6) Why does the calculator show soffit area too?
Soffit is often ordered as panels or coverage surfaces, not only linear trim. Area gives another planning check by multiplying the soffit run by overhang depth.
7) Can I use this for non-rectangular buildings?
Yes, approximately. Break the structure into rectangular runs, calculate each section separately, and add the totals. That method usually gives better accuracy than forcing one irregular shape into one entry.
8) Do deductions reduce both fascia and soffit equally?
Not always. Openings, breaks, or design changes can affect only one trim type. This is why the calculator provides separate deduction inputs for fascia and soffit.