Free Roofing Estimate Calculator

Yes. There is no subscription, no trial period, and no card required, for the roofer installing it or the homeowner using it. Homeowners see a real Good, Better, Best price range with no email required to see a number, and roofers who install it on their own site keep it free forever.

No. Enter your business name and email once to get your embed code and snippet, that is the whole setup. There is no dashboard to log into and no account to manage.

Every submission is emailed to you instantly, with the homeowner's name, contact info, and the full Good, Better, Best price breakdown their answers produced. Lead emails start once you click the one-time confirmation link we send when you set up your embed. The calculator still works for homeowners before that, it just is not emailing you yet.

Yes. Enter your own per-square price for Good, Better, and Best when you set up your embed, and every quote your calculator gives runs on your numbers. Leave any of the three blank and that tier falls back to a solid national default.

The credit line is what keeps the calculator free. Keep it in place and the calculator, the leads, and the emails stay free forever.

Multiply the flat footprint by a pitch multiplier: the square root of 1 plus the rise-over-run ratio squared. A 6/12 pitch gives a multiplier of 1.118, so a 2,000 square foot footprint becomes about 2,236 square feet of actual roof surface. The multiplier only depends on pitch, so the same 1.118 applies whether the house is 1,200 square feet or 4,000.

A roof plane is the hypotenuse of a right triangle formed by the horizontal run and the vertical rise. The hypotenuse of a right triangle is always longer than either leg alone, and it gets longer as the rise grows relative to the run, which is exactly what a steeper pitch does. At zero rise the roof is flat and the multiplier is 1, meaning footprint and roof area match. Add rise and the diagonal distance across that triangle grows, carrying the multiplier above 1 for every square foot of footprint underneath it.

Pitch is a ratio, rise per 12 inches of run, written as X/12. Slope angle is the same relationship expressed in degrees: a 6/12 pitch works out to about 26.6 degrees. Roofers default to pitch because it maps directly to rafter and framing measurements on the job. The degree figure matters more for fall-protection requirements, since OSHA's guardrail and harness rules key off the angle a roof surface sits at, not the X/12 fraction.

Divide the roof area by 100 to get squares, then multiply squares by 3, since a standard bundle covers about 33 square feet. A 2,236 square foot roof works out to 22.4 squares and about 68 bundles once you round up to whole bundles. Add a waste factor on top of that raw number before ordering; see the waste factor question below.

A square is 100 square feet, a unit the roofing trade uses so job sizes, material orders, and crew production rates all speak in the same round number. A 2,236 square foot roof is a 22.4-square roof, and quoting a job in squares lets a supplier, a crew lead, or another contractor size it up instantly without converting units first.

10 to 15 percent on top of the raw bundle count is standard. A simple rectangular gable roof with few penetrations sits at the low end of that range. A roof with dormers, valleys, skylights, or several hips needs closer to 15 percent, since every cut edge and every valley line wastes part of a shingle that a flat, uncut plane would not.

No. The multiplier depends only on pitch, so a hip roof and a gable roof at the same 6/12 pitch both use 1.118. What differs between them is the footprint measurement and the extra hip and ridge lengths a hip roof adds, and those get accounted for separately, on top of the base area, not by changing the multiplier itself.

Measure and calculate each section on its own. A house with a steep 9/12 front gable and a shallower 4/12 rear addition needs two footprint numbers run through two different multipliers, then added together. Running the whole house through one blended pitch produces a number that's wrong for both sections.

It's a solid starting estimate for a simple footprint and a single pitch. Complex rooflines with dormers, valleys, or multiple sections need each plane measured and totaled separately, plus a waste factor, before that number becomes an order you'd hand to a supplier.