A starting job
Pick a common call to fill the plane, cell, rim, and coating. Changing a kit never overwrites hours or material costs you have already typed.
The assembly
Length is the long side. Width is the short side on an attic or cathedral, or the wall height on a crawl. These are starting points, not a drum quote.
Hours and counts
Plane, board feet, rim, waste, and order start from the geometry. Change them when the site disagrees.
Materials and your costs
Payroll burden covers employer taxes, workers’ compensation, liability insurance, and paid time off. An attic-square-foot special written on the floor never sees it — or the rim.
Your bid
- Sprayed plane
- Board feet / ordered
- Open / closed / rim
- Foam share of direct
- Nominal starting R
- Crew hours
- Loaded labor
- Materials
- Travel, mobilization, extras
- Overhead
- Total cost
- Profit
- Price per plane sf
- Price per board foot
- Effective hourly rate
- Walk-away price
Same attic, three cells
Board-foot split, waste, and spray hours change. Your drum prices, wage, rim, and extras stay. The coupon cannot see this table.
| Cell | Bid | vs this bid | $/sf plane |
|---|
Where the hours go
Transparent arithmetic from your own inputs. The starting spans, cell rates, hours, and material rates are common ballpark figures, not an energy-code opinion, a permit, a warranty, or an engineering stamp. Time your own crews and replace them.
Hand the customer a proposal
The price above is for you. This is the page you print or save as a PDF and give to the customer — your details, their details, the scope, the deposit split, and a line for them to sign. Your business details are saved on this device so you only type them once; the customer’s details are never saved.
Everything on the printed page is text you typed or a number this calculator worked out. It contains no warranty, lien, or cancellation wording — those depend on your jurisdiction and your contract, and this tool is not the place to invent them.
Common questions
Why is the unit board feet rather than square feet?
Because foam is sold and yielded by volume, and thickness is the variable that moves cost most. The default attic floor is 40 × 30 ft, or 1,200 sq ft, sprayed at 8 inches — which is 1,200 × 8 = 9,600 board feet. Doubling the thickness doubles the material without touching the square footage, so a per-square-foot price is only meaningful once the depth is pinned down.
Why does the order quantity exceed what actually gets sprayed?
Because of the waste allowance, which defaults to 10%. The plane needs 9,600 board feet, so the estimate orders 10,560. Real losses come from overspray, trimming to depth, hose purge, and the tail of a set you cannot use — a set you paid for either way. Set the allowance to zero only if you are genuinely billing at consumed yield rather than purchased yield.
Why is material almost nine times the labor cost?
That is the shape of a spray foam job, and it is worth seeing plainly: on the defaults the foam and consumables come to $5,993.00 against $707.10 of labor for 16.74 hours. It means your exposure is chemical pricing and yield, not crew speed. A 10% swing in foam cost moves this bid about $600; a 10% swing in labor productivity moves it about $70.
What R-value do the defaults actually deliver?
About R-29.6 — 8 inches of open-cell foam at roughly R-3.7 per inch. That is the nominal centre-of-cavity figure for the product, not an assembly rating, and it does not account for framing, compression, or the air-sealing benefit that is often the real reason for the job. If you are quoting to a code minimum, check the required assembly value rather than the nominal number.
Is my data uploaded anywhere?
No account and no network requests — the calculator runs entirely in your browser. A share link encodes only the inputs you choose into the address bar and is never sent to us, and the optional usage counter records only which features were used and the day, never your spans, wages, costs, or prices.