GritCalc → Guides

Estimating guides

The how and why behind the numbers — plain-English walkthroughs of the material math, each linking to the calculator that runs it for you.

Volume, cubic yards, and the bags-vs-ready-mix line, with a worked slab example.

Footprint, pitch multiplier, squares, and bundles — measure once, order right.

Ampacity, voltage drop, and the NEC small-conductor rule — why 20 A needs #12.

Wall area, coats, and coverage — a room-by-room way to size the order.

Sheets, mud, tape, and screws for a room — with a 12×12 worked example.