Concrete Calculator

Patios, sidewalks, and shed slabs are typically 4 inches thick; driveways and garage slabs 5–6 inches. Order ready-mix by the cubic yard for anything over about 1 yard — mixing 50+ bags by hand is a long day.

An 80 lb bag yields 0.60 cu ft of concrete; a 60 lb bag yields 0.45 cu ft. Always order about 10% extra for uneven subgrade and spillage.