Concrete planning
Concrete calculators that show the quantity math.
Start with the shape you are pouring. Every tool exposes its assumptions, includes a practical order quantity, and separates material math from structural design.
Choose a calculator
14 toolsEstimate ready-mix cubic yards or whole concrete bags for slabs and pads.
→ConcretePost Hole Concrete CalculatorEstimate concrete volume and whole bags for round or square post holes, with optional post displacement.
→ConcreteConcrete Footing CalculatorEstimate ready-mix cubic yards and concrete bags for continuous strip footings or isolated pad footings.
→ConcreteConcrete Column CalculatorEstimate cylindrical column or form-tube concrete volume, ready-mix, and whole bags.
→ConcreteConcrete Block CalculatorEstimate concrete masonry units for a rectangular wall using nominal block dimensions, openings, and an adjustable allowance.
→ConcreteRebar CalculatorEstimate grid bar counts, total linear feet, stock-bar equivalents, and steel weight for a rectangular slab.
→ConcreteConcrete Slab Cost CalculatorEstimate installed slab cost and concrete volume with adjustable local rates.
→DrivewaysConcrete Driveway Cost CalculatorPlan concrete driveway quantities and installed cost by size and local rate.
→ConcreteBase Material CalculatorEstimate aggregate base volume, rounded tonnage, and delivered material cost for a slab or patio.
→ConcreteReady-Mix vs. Bags Cost CalculatorCompare whole-bag costs with ready-mix delivery, minimum orders, short-load charges, and handling costs.
→ConcreteConcrete Slab Materials CalculatorBuild one quantity list for slab concrete, aggregate base, and an optional drawing-specified rebar grid.
→ConcreteConcrete Patio Cost CalculatorEstimate patio concrete and a local installed cost range, including finish upgrades and removal.
→ConcreteConcrete Sidewalk Cost CalculatorEstimate walkway concrete quantity and installed cost from width, run length, removal, and quoted rates.
→ConcreteConcrete Steps CalculatorCalculate concrete for a solid flight of equal steps, an optional landing, and either bags or ready-mix.
→Compare materials and project choices
6 referencesCompare 4-inch and 6-inch concrete slabs by volume, bag count, and budget inputs without treating thickness as a design recommendation.
Compare concrete slab sizes using explicit example installed rates, with volume references and adjustable project cost links.
Compare concrete and asphalt driveway costs, maintenance, repairs, base work, and quote inclusions with matching inputs.
Compare concrete and pavers for a patio by installed scope, maintenance, repairability, appearance, and drainage.
Compare the full DIY and contractor cost of a concrete slab, including material, delivery, equipment, labor, finish, and correction contingency.
Compare delivered ready-mix with 40, 60, and 80 lb concrete bags by quantity, full delivered cost, workload, and project fit.
Concrete quantity and buying guides
Compare 40, 60, and 80 lb concrete bag yields per cubic yard, with rounding and a half-yard example.
Compare ready-mix quotes using billed volume, delivery, minimum orders, short-load fees, and a complete cost breakdown.
Choose a waste and contingency allowance based on cuts, breakage, grading, compaction, matching, and supplier packaging.
Turn a calculator estimate into a scope checklist so bids can be compared on the same work, materials, and exclusions.
A repeatable field-measurement method for areas, volumes, slopes, openings, and irregular project shapes.
Distinguish finished depth, loose delivery volume, density, and supplier rounding when ordering base aggregate.
A reliable sequence
Measure, separate, then add.
- 01Split the pour into simple shapes
Keep slabs, holes, footings, and thickened edges separate so one assumption does not hide another.
- 02Use the finished dimensions
Calculate from the formed or excavated volume, not nominal project labels.
- 03Confirm the order with the supplier
Adjust waste, bag yield, truck minimums, and delivery increments before purchase.