Construction guides for US contractors

Estimate concrete for cylindrical forms and post holes from diameter and fill depth, subtract post displacement, and convert the volume into bags.

Prepare a US concrete order with a volume worksheet, allowance check, supplier questions and delivery details. Copy the checklist into your job notes.

Compare bagged and delivered concrete using volume, bag yield, labor, equipment and supplier fees. Includes a worked 1-cubic-yard cost worksheet.

Convert 8 ft 6 in to 8.5 feet, handle fractional inches, and convert decimal feet back to feet and inches without confusing inches with decimals.

Compare 40, 60 and 80 lb concrete bag yields, bags per cubic yard, and a 10-by-6-foot slab example. Add an allowance once, then round up.

Calculate slab concrete from feet and inches, convert cubic feet to yards, and check a 20-by-12-foot example with the allowance shown separately.

Calculate square feet from feet and inches, work through an L-shaped room, subtract openings, and turn measured area into a material order.

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.