Soffit Calculator
Enter your size to get soffit quantity, plus an estimated cost. Waste is included and prices are editable.
Material needed
Estimated cost
The Material needed figure is the length of soffit to buy, including extra for waste, and the Material cost is the estimated price for that length, so you can cover the full run without running short.
How to calculate soffit
Soffit sold by the foot. Enter eave length to get feet needed.
Formula: quantity = length × 1 × (1 + waste %) = 20 × 1 × 1.10 = 22 ft.
Worked example
Example: 20 ft long. Quantity: 22 ft, about $132 at $6 per ft.
Tips
Measure the full area, then subtract large openings if you want an exact count. Order a little extra for cuts and breakage, and confirm quantities with your supplier before you buy.
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Frequently asked questions
How much soffit do I need?
Example: 20 ft long. Quantity: 22 ft, about $132 at $6 per ft.
How much waste should I add?
Add 10% for straight areas and 15% for areas with many cuts, corners and openings.
Are the prices accurate?
Prices are editable estimates. The defaults are typical US figures, and your local price can be higher or lower.