Calculators for the roof, the attic, and keeping rooms cool. The roofing calculator turns the house footprint and the roof pitch into squares and bundles of shingles (3 bundles per square for most standard shingles), and the roof pitch calculator gives the pitch as x/12, in degrees, and in percent. The attic insulation calculator gives the R-value to add for your climate zone from ENERGY STAR, with the depth and bags of blown fiberglass, and the AC size calculator sizes a room air conditioner in BTU from the ENERGY STAR chart.
Enter the rise and run to get your roof pitch in x/12, degrees, and percent, plus the slope factor and rafter length. Includes a roof pitch chart from 1/12 to 24/12, three ways to measure pitch, and IRC minimum slopes by roof covering.
Enter your attic size, climate zone, and current insulation to see the R-value to add, the blown-in depth, and how many bags you need. Includes ENERGY STAR’s attic recommendations by zone and a blown-in fiberglass coverage chart.
Enter your house length, width, eave overhang, and roof pitch to get squares and bundles of shingles. Includes slope factors, bundles per square by shingle type, and starter and ridge cap estimates.
Enter your room size and a few details to get the right room air conditioner size in BTU. Based on the ENERGY STAR sizing chart with adjustments for sun, shade, people, and kitchens.