Estimate your soffit area, panels, fascia, trim, and ventilation in seconds.
This soffit calculator takes the guesswork out of your next overhang project. Enter your eave measurements and it instantly estimates the soffit area, number of panels, fascia, trim and ventilation you'll need — no spreadsheets, no manual math. Whether you're a contractor pricing a job or a homeowner planning a weekend install, this free soffit estimator gives you a reliable material list in seconds. It doubles as a soffit and fascia calculator, so you can size both the horizontal soffit and the vertical fascia board from the same set of numbers.
Soffit area is calculated by multiplying your total eave length by the soffit width — the depth of the overhang from the wall to the roof edge. For example:
100 ft eave length × 1 ft soffit width = 100 sq ft
Because installation always involves offcuts around corners and vents, the tool adds a waste allowance (typically 10–15%) on top of the base figure. As a soffit square footage calculator, it handles multiple roof sections and mixed units (feet or meters) and converts everything for you, so the total is right even on an irregular roofline.
Different materials come in different panel sizes, so this soffit material calculator lets you enter your exact panel dimensions for an accurate count. Use it as a vinyl soffit calculator for lightweight, low-maintenance vinyl panels, or as an aluminum soffit calculator when you need a more durable, weather-resistant finish. Because the tool is brand-agnostic, it works just as well as a CertainTeed soffit calculator or a Rollex soffit calculator — simply plug in the panel size from the product you're buying, whether you picked it up from a big-box store like Lowes or a local supplier, and the numbers adjust automatically.
Once you know how much material you need, pricing the job is easy. Use this soffit and fascia cost calculator by multiplying the panel, fascia and trim quantities it returns by your local material prices to get a fast, itemized quote. As a combined soffit and fascia cost estimator, it helps you avoid the two most common budgeting mistakes: ordering short and paying for a second delivery, or over-ordering and eating the excess. Whether you think of it as a soffit cost calculator for a single elevation or a full soffit fascia cost estimator for the whole house, starting from accurate quantities keeps your estimate tight and your margins protected.
Proper airflow protects your roof from moisture, heat and ice damming, so the built-in soffit ventilation calculator is more than a nice extra. It helps you calculate soffit vent area using the Net Free Area (NFA) of your chosen panel — solid, center-vented or fully vented — and checks it against the ventilation your attic actually needs. The standard rule is 1 sq ft of net free vent area per 150 sq ft of attic floor (or 1:300 with a proper vapor barrier), split roughly 50/50 between intake at the soffit and exhaust at the ridge.
That makes it a practical tool for calculating soffit vents before you buy. Enter your attic size and it will calculate soffit vents against the target ratio, so your soffit vent calculation lands in the safe zone. If you've ever been unsure about soffit vent size calculation or wanted a quick soffit vent air flow calculator to sanity-check intake, this section does the heavy lifting — and if you're comparing it to a store tool like a Lowes soffit vent calculator, this one shows you the underlying NFA math instead of hiding it.
Multiply your total eave length by the soffit width (the overhang depth), then add 10–15% for waste. This free fascia and soffit calculator does it automatically and also returns panel, fascia and trim counts, so you get a complete material list rather than just a square-footage figure.
Yes. Fascia runs the same total length as your soffit line, so the tool sizes both at once. Enter your fascia board length and it works out how many boards you need alongside the soffit panels — a true soffit fascia calculator in one place.
Absolutely. Enter the panel size for your specific product and the count updates instantly, whether you're using it as a vinyl or aluminum soffit calculator. The same applies to branded panels — it functions as a CertainTeed soffit calculator or Rollex soffit calculator just by changing the panel dimensions.
Take your attic floor area and divide by 150 (or 300 with a vapor barrier) to find the total net free area required, then aim for about half of that at the soffit. The soffit ventilation calculator above runs this soffit vent calculation for you and flags whether your chosen vented panel meets the target.