Concrete by project
Real-world guides for the most common pours — the right thickness, reinforcement, and bag-vs-truck call for each, with the calculator built in.
The volume math is the same for every pour, but the right answer isn't. A garage slab wants 5–6 inches and rebar; a patio is fine at 4 inches with mesh; a shed base sits right at the point where bagged concrete and a ready-mix truck cross over on price; fence posts are a bag job sized per hole. Each guide here pairs the correct specification for that project with the calculator, so you're not just getting a number — you're getting the number that's actually appropriate for what you're building.
For the underlying formulas and assumptions see the methodology, browse every tool on the all-tools page, or roll a whole job into one material list with the cost estimator.