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Concrete and masonry calculators
Turn a slab into yards, bags, a weight, and a cost from your own prices, a grid into pounds of rebar, or a wall into blocks, brick, and mortar.
Cubic Yard Calculator
Cubic yard calculator for a rectangle, circle, triangle, or a known area. Feeds the gravel, concrete, asphalt, and soil tools.
Concrete Calculator
Concrete calculator for a slab, footing, column, or steps. Cubic yards, tons, and 40, 60, and 80 pound bag counts.
Asphalt Calculator
Asphalt calculator in tons. Compacted hot mix at 145 lb/ft³, for a rectangle, circle, or triangle.
Rebar Calculator
Rebar calculator for a grid. Bar count, a lap you enter, total length, and weight from ASTM A615 nominal pounds per foot.
Concrete Block Calculator
Block calculator for a CMU wall. Blocks on the 16 × 8 in module, mortar, grout, and vertical cells.
Concrete Cost Calculator
Concrete slab cost from your local ready-mix or bag price. Yards, bags, short-load fees, and add-ons. No national average price.
Brick Calculator
Brick calculator for a single-wythe wall. BIA specified sizes, a joint, waste, and mortar bags. Not a structural design.
Concrete Weight Calculator
Concrete weight from a slab, a footing, a column, a bag, or a known volume. Density is editable. Not a structural load.
How these calculators work
One cubic yard is 27 cubic feet. The cubic yard calculator is the shared geometry: rectangle, circle, triangle, or an area you already measured. Concrete and asphalt start from that volume. Concrete steps are treated as solid stacked rectangles, width × tread × riser × n(n+1)/2, which is the volume of the triangular stair block.
Bag yields are the Quikrete Concrete Mix data sheet 1101 figures: a 40 lb bag makes 0.30 cu ft, a 60 lb bag 0.45, an 80 lb bag 0.60. The cost page also uses the sheet’s 50 lb yield, 0.375 cu ft. Weight uses 150 lb/ft³ for normal-weight concrete, which is 2.025 ton/yd³. Asphalt uses 145 lb/ft³ as compacted finished thickness, 1.9575 ton/yd³. Add waste for spillage. Neither number replaces the mix ticket. Prices on the cost page are what you type.
The rebar calculator counts a grid, adds a lap you type, and weighs the total with ASTM A615 nominal pounds per foot. It does not compute a development length. The block calculator counts 8 × 16 in modules, then mortar and grout from the joint geometry. The bag yield on the mortar sack wins. The brick calculator counts a single wythe from BIA specified sizes. The weight calculator turns a volume into pounds at a density you can edit. Neither one is a structural design.