Calculate exact material quantities for soffit panels and fascia boards — including waste, cost estimates, and a full breakdown.
Enter your building's total roofline perimeter (the combined length of all eaves and rakes), the soffit overhang width, and the fascia board width. Choose your board length, materials, and pricing, then adjust the waste slider before hitting Calculate Materials. The tool returns square footage of soffit, linear footage of fascia, board counts, and a full cost breakdown.
Soffit and fascia are two of the most frequently under-ordered materials in roofline projects. A typical 2,000 sq ft ranch home has roughly 160–200 linear feet of eave perimeter. At a 12-inch overhang, that's 160–200 sq ft of soffit alone — and forgetting the 10–15% waste factor means you'll be making a second trip to the lumber yard mid-project.
Over-ordering is expensive too. Vinyl soffit runs $1.50–$4.00 per square foot; aluminum fascia can reach $5–$8 per linear foot. On a large two-story colonial with 280 linear feet of perimeter, a 20% over-estimate adds $200–$400 in unnecessary material cost. Contractors, DIYers, and estimators all benefit from an accurate calculation before purchasing.
Use the Multi-Side Mode when different eaves have different overhang depths — common on hip roofs or homes with garage additions. Enter each side separately for the most accurate total.
Soffit Area:
Soffit Area (sq ft) = Perimeter (ft) × Overhang Width (ft)
Overhang width in inches is divided by 12 to convert to feet first.
Fascia Linear Footage:
Fascia LF = Perimeter (ft) — fascia runs the full perimeter length.
With Waste Factor:
Final Quantity = Base Quantity × (1 + Waste% / 100)
Board Count:
Boards = ⌈ Length Needed / Board Length ⌉ (always rounded up to whole boards)
Fascia is the vertical board that runs along the roofline and caps the rafter tails. Soffit is the horizontal panel that closes the gap between the fascia and the wall of the house underneath the eave. Together, they protect the rafter tails and attic from moisture, pests, and weather.
For a hip roof, measure all four eave lengths at the bottom edges of the roof — the two long sides and the two shorter hip ends. Add them together. There are no rake edges on a true hip roof, so this sum is your full fascia perimeter. For a standard gable roof, measure both long eave sides plus both gable rake lengths.
Standard vinyl soffit panels are 12 inches wide and come in 12-ft lengths. If your overhang is 12 inches, one panel covers one square foot per linear foot. For a 16-inch overhang, you'll need one and a third panels wide — effectively two panels per run with an overlap seam. The calculator accounts for the square footage automatically.
Vinyl is cheaper ($1.50–$3/sq ft), easier to cut, and resists moisture well — ideal for most residential projects. Aluminum costs more but holds paint better, resists denting, and suits coastal or high-humidity climates. Wood looks the best but requires regular painting and is susceptible to rot. Fiber cement is the most durable but heaviest and most expensive to install.