Every concrete calculation you'll ever need — slabs, foundations, walls, mix design, rebar, cost, cure time & more. Built to ACI · IRC · ASTM standards. Free, instant, no sign-up.
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Cubic yards, bags & cost for any flat pour — driveways, patios, garage slabs, pool decks & more.
Total slab length in feet
Total slab width in feet
US avg $130–$160 in 2025
⚠️ Estimates only. Always add 10% waste. Consult a licensed PE for structural projects.
Bags & cubic yards for sonotubes, round piers, deck footings & any cylindrical concrete element.
Sonotube / pier diameter
Total depth below grade
Total identical footings
US avg $130–$160 in 2025
⚠️ Estimates only. Always add 10% waste. Consult a licensed PE for structural projects.
Volume, bags & cost for poured walls — retaining walls, basement walls, foundation walls & any vertical structure.
Total wall length in feet
Wall height above footing
Wall thickness in inches
US avg $130–$160 in 2025
⚠️ Estimates only. Always add 10% waste. Consult a licensed PE for structural projects.
Concrete volume for round columns, square columns & rectangular beams. Multiple members supported.
Diameter or width in inches
Leave blank for columns
Column height or beam span
Number of members
US avg $130–$160 in 2025
⚠️ Estimates only. Always add 10% waste. Consult a licensed PE for structural projects.
Follow these 5 steps used by US contractors & engineers to accurately estimate any concrete project
Typical proportions by weight for 4,000 PSI residential concrete per cubic yard
Normal-weight concrete density
Bags needed for 1 full yd³ pour
ACI 318 minimum for residential slabs
For exposed & freeze-thaw conditions
Key facts every US contractor, builder & homeowner should know before ordering concrete.
Every tool references ACI 318, IRC 2021, ASTM C94 & ADA PROWAG — the exact standards US engineers & inspectors use.
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All calculations run in your browser — no server calls. Get cubic yards, bags & cost in under a second.
Driveways, patios, floors, sidewalks, pool decks, parking lots & all flat concrete pours
Strip, spread, raft, mat, piers, deck footings, post footings & specialty foundation bases
Retaining walls, CMU block walls, columns, beams, curbs & lintels
Stairs, ADA ramps, pool shells, tanks, drainage channels & specialty pours
Ready-mix cost, labor, total project budget, contractor quotes & bid sheets
Ready-mix, bags, cement, sand, gravel, aggregate & mix proportions
Rebar quantity, weight, spacing, wire mesh, fiber & reinforcement cost
Set time, cure time, slump, w/c ratio, PSI strength & admixtures
Load capacity, moment, shear, deflection, bearing pressure & structural design
Crack repair, resurfacing, sealer coverage, grinding, overlays & joint filling
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