Roofing Calculators

Roofing Calculators for Pitch, Materials & Rafter Layout

Accurate roof measurements are critical for ordering the right amount of material and cutting rafters to the correct length. Our roofing calculators help you convert between pitch, degrees, and slope percentage, estimate shingle bundles and sheathing sheets, and calculate rafter lengths for any roof geometry. The roof pitch calculator is a live converter — enter any two of seven values (rise, run, pitch, angle, slope percent, diagonal, or roof area factor) and all other values update instantly. It also shows material compatibility so you know which roofing products work at your pitch. The roofing materials calculator estimates bundles of shingles, rolls of underlayment, sheets of sheathing, and ridge cap based on your roof dimensions and pitch. Both tools account for waste factors and display results in multiple formats. Whether you are a roofing contractor bidding a job or a homeowner planning a re-roof, these calculators give you the numbers you need to order materials with confidence.