Soffit Material Calculator
Estimate soffit area, full panels, vented and solid panel quantities, waste allowance and material cost from eave length and overhang depth.
Default project preview
30 panels
Net soffit area
320 ft²
Vented panels
11
Solid panels
19
Panel coverage
12 ft²
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Total enclosed eave length
Enter this project assumption in ft. The current imperial default is 160 ft.
Average soffit depth
Enter this project assumption in ft. The current imperial default is 2 ft.
Panel length
Enter this project assumption in ft. The current imperial default is 12 ft.
Panel coverage width
Enter this project assumption in in. The current imperial default is 12 in.
Vented panel share
Enter this project assumption in %. The current imperial default is 35 %. Minimum: 0. Maximum: 100.
Cutting allowance
Enter this project assumption in %. The current imperial default is 12 %. Minimum: 0. Maximum: 50.
Price per panel
Enter this project assumption in a unitless value. The current imperial default is 18. Minimum: 0.
How to read the outputs
Net soffit area
eave length × depth. Default preview: 320 ft².
Vented panels
35% modeled share. Default preview: 11.
Solid panels
remaining panels. Default preview: 19.
Panel coverage
effective panel area. Default preview: 12 ft².
Purchased area
full panels. Default preview: 360 ft².
Panel cost
soffit panels only. Default preview: $540.00.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Soffit area = eave length × soffit depth. Panels = round up (area × allowance factor ÷ panel coverage area).
Reviewed project guidance
How to use this estimate in a real project
Last reviewed: July 30, 2026
Estimate soffit panels from eave length and overhang depth while separating solid, vented and accessory components.
Calculation steps
- 1Measure each soffit run and average depth.
- 2Calculate area and separate vented zones.
- 3Apply cutting allowance.
- 4Round panels, channels and vents independently.
Worked numerical example
A 120 ft eave with a 2 ft overhang has 240 ft² of soffit area. With 10% allowance, plan 264 ft² and divide by the exact panel or carton coverage.
Purchasing and rounding
Order panels with matching J/F channels and verify net-free ventilation area where vented soffit is part of the attic system.
Interpret the result
Area determines cladding quantity, not required ventilation capacity or moisture performance.
Page-specific assumptions
- Rectangular soffit strips.
- Uniform panel coverage.
- Vented and solid areas are identified.
Common mistakes
- Using total panel area as net-free vent area.
- Ignoring channels and corners.
- Blocking ventilation with insulation.
Primary and technical references
BuildMeter provides planning estimates, not engineering, architectural, electrical, mechanical, plumbing, permit or code approval. Review the methodology and verify final decisions with product documentation and qualified professionals.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Soffit Material Calculator questions
Should every soffit panel be vented?+
Not necessarily. Vent layout depends on the roof ventilation strategy and product net-free area.
Why use coverage width instead of nominal width?+
Interlocking profiles may cover less than their nominal panel dimension.
Does this include channels and trim?+
No. J-channel, fascia trim, fasteners and corner details should be estimated separately.