Construction guides for US contractors

Convert feet-and-inches measurements to decimal feet for construction area, volume and estimating calculations, with examples and common mistakes.

Calculate 80 lb concrete bag quantities from cubic feet, understand typical yield, and avoid rounding or allowance mistakes before buying material.

Use feet and inches to calculate concrete volume for a slab, footing or column, then convert cubic feet to cubic yards and add a sensible allowance.

Measure rectangles, triangles and irregular spaces in square feet, subtract openings consistently and keep a separate material allowance.

Convert roof surface area to roofing squares, account for pitch and waste separately, and translate the result into shingle bundles using product coverage.

A practical construction conversion reference for inches, feet, square feet, cubic yards, US gallons, pounds, PSI and common metric units.