Roofs, slabs, footings and block walls all depend on getting quantities and angles right before the order is placed. These calculators help with roof pitch and rafter length, shingle bundles, concrete volume for slabs and footings, rebar, blocks, bricks, retaining walls and gutters. Each page explains its formula and lists its limits.

All Roofing, Concrete & Masonry calculators

How to get good results

These tools give planning quantities and not engineering designs. Structural work, load paths, footing depth and local code need a licensed professional and your local building department.

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Last updated: November 2026