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Soffit Panel Calculator

Estimate how many soffit panels you need to cover the underside of a roof overhang.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-25 · v1.0.0

Market
Imperial · sales tax
49.21 ft1.5 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Soffit panels needed

7 x 12 sq ft panels

High confidence
Overhang area (with waste)
81.17 sq ft

For the dimensions entered, expect a soffit panels needed of 7 x 12 sq ft panels. Note that total eave length sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. Set for United States against IRC 2024. The market selector changes both the units and the code cited.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Standard vented vinyl/aluminum soffit panel is 12 in wide x 12 ft long (12 sq ft); panel count = overhang area / 12, rounded up with a waste allowance

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Does a wider overhang need more panels per linear foot?
Yes — panel count scales with total area, not just eave length, since a deeper overhang needs more panel width to span it (sometimes more than one panel's width, requiring a rip cut).
Should I use vented or solid soffit panels?
This estimates panel count either way, since both come in the same standard size — vented panels provide attic airflow (check against the Attic Fan CFM or ventilation calculators for how much net free area you need) while solid panels are purely cosmetic.
Does this account for corner and F-channel trim?
No — this is panel material only. Budget separately for J-channel, F-channel, and corner trim pieces based on your specific corner count and wall-to-fascia transitions.