Soffit calculator: how many soffit panels do I need?
16 soffit panels
140 pieces 16 in deep, 9 cut from each 12 ft panel · 186.7 sq ft of soffit · 12 fascia pieces of 12 ft · for 140 ft of eaves in panels covering 12 in
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Enter it the way you measured it: 4.5, 4 1/2,
3/8 or 10' 6".
16 soffit panels
140 pieces 16 in deep, 9 cut from each 12 ft panel · 186.7 sq ft of soffit · 12 fascia pieces of 12 ft
140 feet of eaves with a 16 inch deep soffit take 16 soffit panels covering 12 inches and 12 feet long: each piece runs from wall to fascia, one panel yields 9, and 140 pieces need 15.6 panels, rounded up.
A worked example
87 1/2 ft of eaves with a 22 inch deep soffit, in panels covering 16 inches and 12 feet long, with fascia in 16 ft lengths needs 11 soffit panels. 1,050 inches of eave at 16 inches is 65.6, so 66 pieces; a 144 inch panel gives 6 pieces of 22 inches, so 11 panels, plus 6 fascia pieces of 16 feet.
How do you measure for soffit?
Measure the length of every eave and rake to cover, and the depth of the soffit from the wall to the back of the fascia. Pieces are cut to that depth, so the depth decides how many come out of one panel: a 12 ft panel gives 9 pieces at 16 inches but only 6 at 22 or 24.
How many square feet of soffit do I have?
Eave length × soffit depth in inches ÷ 12: 140 feet at 16 inches is 186.7 square feet. Buy by pieces rather than by that figure, because the scrap left at the end of each panel depends on the depth.
What else it is called
Soffit is sold as vinyl soffit, aluminum soffit or soffit panels, vented or solid, and searched as a soffit calculator, vinyl soffit calculator or soffit and fascia calculator. Vented panels are the intake side of attic ventilation.
Pieces per soffit panel
| Soffit depth | 10 ft panel | 12 ft panel | 16 ft panel |
|---|---|---|---|
| 8 in | 15 | 18 | 24 |
| 12 in | 10 | 12 | 16 |
| 16 in | 7 | 9 | 12 |
| 18 in | 6 | 8 | 10 |
| 20 in | 6 | 7 | 9 |
| 24 in | 5 | 6 | 8 |
Pieces cut from one soffit panel: panel length in inches ÷ soffit depth, rounded down; the rest of the panel is scrap. Divide the pieces your eaves need by this number for the panels to buy.
Where the numbers come from
- Soffit is counted in pieces, not square feet: each piece runs from the wall to the fascia and covers the panel's coverage width along the eave. Pieces = eave length in inches ÷ coverage width, rounded up; one panel yields its length ÷ the soffit depth, rounded down, and the rest is scrap; panels = pieces ÷ pieces per panel, rounded up.
- The coverage width and the length are the ones printed on your panels, so none of the figures is ours to source: they differ by maker and profile. Fascia pieces = eave length ÷ fascia length, rounded up.
This counts straight runs. Outside corners and rakes take miter cuts that can spoil a piece, and J-channel or F-channel is not counted here.
By Javier Miralles · Last updated . How this site is made.
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