Roofing Calculators
Roof pitch, roofing material and roof replacement cost — measure your roof, size the materials, and price the job.
CalcBooth’s roofing calculators take a roof from a few ground measurements to a full materials and cost picture. Start with the roof pitch calculator to turn a rise-over-run reading into your slope, angle and the slope factor that scales your footprint to true roof area. Feed that into the roofing material calculator to get squares, shingle bundles, underlayment, drip edge and nails, with a shopping list you can take to the store. Then use the roof replacement cost calculator to put a price range on the job by material, including tear-off and labor, so you know what a fair quote looks like before you call a contractor. Every tool shows the formula it uses and updates live as you type, so you can try different pitches, materials and waste factors and see the numbers move. Roofing figures are planning estimates: confirm exact quantities and pricing with your supplier or roofer before you buy or sign.
Which calculator do I need?
| Calculator | What it works out |
|---|---|
| Roof Pitch Calculator | Find your roof pitch from a simple rise-and-run measurement — get the pitch in X-in-12, the angle in degrees, the slope factor and the rafter length per foot of run. |
| Roofing Calculator | Calculate how much roofing material you need — enter your roof footprint and pitch to get roofing squares, shingle bundles, underlayment, drip edge and nails, with a shopping list. |
| Roof Replacement Cost Calculator | Estimate what a new roof costs — enter your roof size, pitch, material and whether you need a tear-off to get a low-to-high total, the cost per square, and a materials-versus-labor breakdown. |
| Gutter Size Calculator | Find what size gutter your roof needs - enter the roof area, gutter run and local rainfall to get the required flow in gallons per minute, the gutter and downspout size from the plumbing code, how many downspouts and how much fall to set. |
| Gutter Installation Cost | Estimate what new gutters cost - enter the run, material, number of stories and whether the old gutters come off to get an installed total, the cost per linear foot and a breakdown by line item. |
How these estimates are built
Every calculator in this category publishes the formula it runs, the constants it assumes, a worked example you can reproduce by hand, and the standard or manufacturer data sheet each constant comes from. Quantities include an adjustable waste allowance and round up to whole units, because you cannot buy part of a bag or box.
Cost figures are national US ranges and are material-only unless a calculator says "installed", so they exclude tax, permits and local labour rates. These are planning estimates, not quotes — read the full calculation methodology for what they cover, and the disclaimer for the structural and HVAC limits that apply.