Concrete Calculators

Slabs, Patios, and Flatwork

Rectangular and odd-shaped pours, priced in the units suppliers actually sell: cubic yards for the truck, bags for anything under about a yard.

• Material Calculator for a Concrete SlabCalculate the concrete bag count or ready-mix yardage for your slab from exact dimensions, using published bag yields and the standard NRMCA ordering allowance.
• Patio Concrete CalculatorCalculate cubic yards for a concrete patio pour from your exact dimensions, with the standard NRMCA ordering allowance so you don't get hit with a short-load fee.
• Concrete Square Foot CalculatorTurn a square-footage measurement into cubic yards with the same closed-form math a ready-mix dispatcher uses, plus the standard NRMCA ordering allowance.
• Concrete Thickness CalculatorSee how much concrete volume changes as you adjust slab thickness, since a small depth change moves yardage more than most people expect before ordering.
• Triangle Concrete CalculatorCalculate concrete volume for a triangular slab using the half-prism formula V = ½ × L × W × T: the same math this site's ramp calculator runs, relabeled.

Steps, Curbs, Ramps, and Formed Shapes

Compound geometry done properly: a staircase is a stack of prisms, a curb is a cross-section times a length. Each tool shows the derivation.

• Concrete Step CalculatorCalculate solid concrete volume for a set of steps from width, rise, run, and step count, with a code-riser flag and the standard NRMCA ordering allowance.
• Concrete Curb CalculatorCalculate concrete volume for a standalone curb from its cross-sectional dimensions and run length, plus the standard NRMCA ordering allowance.
• Curb and Gutter Concrete CalculatorCalculate concrete volume for combined curb-and-gutter sections from your cross-section dimensions and run length, plus the standard NRMCA ordering allowance.
• Concrete Ramp CalculatorCalculate concrete volume for a tapered ramp using the wedge formula V = L × W × H ÷ 2, plus the standard NRMCA ordering allowance for the pour.
• Duct Bank Concrete CalculatorConduits inside a duct bank displace concrete: most estimates ignore it. This calculator nets it out, then adds the standard NRMCA ordering allowance.

Walls, Block, and Mix

Block counts from modular face sizing, ICF fill volumes, and batch proportions with the dry-volume factor labeled for what it is.

• Concrete Block Wall CalculatorCalculate the number of standard 8×16 CMU blocks and mortar bags needed for your wall area, using the modular 0.889 sq ft face and a labeled breakage allowance.
• ICF Concrete CalculatorCalculate the concrete core-fill volume for insulated concrete form walls: wall length times height times core thickness, with the standard ordering allowance.
• Concrete Mix Design CalculatorWhat most searches for 'mix design' actually want is 1:2:3 volumetric batching; real ACI 211 mix design is different. This calculator does batching, honestly.

Prep, Finishing, and Recycled Base

Sealer by real coverage bands, self-leveler scaled to your average fill depth, crushed concrete by the ton.

• Concrete Sealer CalculatorEstimate concrete sealer gallons from your surface area and finish type, using the manufacturer coverage band of roughly 200-400 sq ft per gallon.
• Self-Leveling Concrete CalculatorEstimate self-leveling underlayment bags from your floor's average fill depth, not a flat coverage guess: real consumption doubles fast on uneven substrates.
• Crushed Concrete CalculatorCalculate crushed concrete volume and tonnage for base material, with the standard 324 divisor rule and a 10-20% compacted-base ordering allowance.

What Concrete Work Costs

Modeled labor from published wage data plus sampled material prices, always as a dated band. Never a national average.

• Concrete Foundation Cost CalculatorSize an 8-inch foundation pour and see a modeled labor band plus sampled material pricing, not a single blended 'average cost' number that hides the real variables.
• Concrete Sidewalk Cost CalculatorPrice a standard 4-foot-wide sidewalk run with a modeled masonry labor band and sampled material costs: honest ranges, not one blended average figure.
• Concrete Steps Cost CalculatorPrice a solid-stair concrete pour with a modeled masonry-crew labor band and sampled 80 lb bag material costs: steps take more labor per yard than a flat slab.
• Concrete Demolition Cost CalculatorEstimate debris volume and tonnage from the slab you're removing, plus a modeled labor band for breaking, loading, and hauling; material isn't the cost driver here.
• Polished Concrete Floor Cost CalculatorPolishing is labor-dominated, not material-dominated. This tool sizes densifier/sealer quantity plus a modeled masonry-crew labor band instead of one flat price.

Worth Reading First

• Why Concrete Calculators Disagree
• Yards, Bags, or Tons: Buying Bulk Material Without the Unit Trap