CalcMyMaterials

How much concrete for a 20 ft × 20 ft?

A 20 ft × 20 ft concrete project is pre-filled below. Adjust any value to match your exact job.

Quick answerA 20 ft × 20 ft concrete project needs 4.94 cubic yards (ready-mix) — buy 5.28 to cover waste — about $660–$871.2 in materials (US national average, 2026).
Your project
Standard size shown by default. Change any value — the answer recomputes instantly.
You need
5.28cubic yards (ready-mix)
Exact need: 4.94 cubic yards (ready-mix) · plus 7% waste allowance
Material cost
$660–$871.2
Installed (US avg)
$2,190–$2,941
Shopping list
Items to buy with quantity and price range
ITEMQTYPRICE RANGE
cubic yards (ready-mix)5.28$660–$871.2
Estimated material total$660–$871.2
Alternative buy formats
  • 238 × 80 lb bags — $1,309–$1,904
  • 318 × 60 lb bags — $1,431–$2,226

20 ft × 20 ft at different depths

20 ft × 20 ft footprint of ready-mix concrete
DepthYou needBuy (with waste)Material cost
1″1.23 cubic yards (ready-mix)1.32 cubic yards (ready-mix)$165 – $217.8
2″2.47 cubic yards (ready-mix)2.64 cubic yards (ready-mix)$330 – $435.6
3″3.7 cubic yards (ready-mix)3.96 cubic yards (ready-mix)$495 – $653.4
4″4.94 cubic yards (ready-mix)5.28 cubic yards (ready-mix)$660 – $871.2
6″7.41 cubic yards (ready-mix)7.93 cubic yards (ready-mix)$991.25 – $1,308.45

Other sizes