All Roofing Calculators is a free set of 18 roofing and siding calculators for homeowners, DIYers and contractors. Estimate roof replacement and inspection costs, measure roof area and pitch, size rafters and trusses, and work out shingles, metal, tiles, sheathing, vents, gutters and siding. No sign-up, works in the browser, and every tool explains its formula step by step.