Concrete, Block & Hardscape Calculators

About These Calculators

Concrete work punishes guessing: too little material mid-pour creates weak cold joints, and too much means paying to haul away hardened waste. Cured Portland cement concrete weighs about 4,000 lbs per cubic yard (roughly 148 lbs per cubic foot), and every pre-mixed bag yields a fixed wet volume—0.60 cu ft for an 80 lb bag, 0.45 cu ft for a 60 lb bag, and 0.30 cu ft for a 40 lb bag—so 45, 60, or 90 bags respectively make one cubic yard. The calculators in this silo convert your slab, footing, post hole, or wall dimensions into exact bag counts, ready-mix cubic yards, and total pour weight, then flag the roughly 1.5-cubic-yard point where a ready-mix truck beats hand-mixing on both cost and quality. You will also find the hardscape side of the trade here: retaining wall blocks, paver counts, asphalt tonnage, and the crushed-stone sub-base quantities that decide whether the finished work lasts five years or thirty.