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Concrete Calculator for 20x20 Slab (6" Depth)

For a 20' x 20' slab with 6" depth, you need 7.41 cubic yards of ready-mix concrete.

Concrete Calculator

Calculate cubic yards, cubic feet, and 60lb/80lb premixed bags.

Length (Feet)

Width (Feet)

Depth (Inches)

Cubic Yards

7.41 yd³

Cubic Feet

200.0 ft³

Premix Bags

~334 80lb / ~445 60lb

Volume = 20 x 20 x (6/12) = 200.0 cubic feet. Cubic Yards = 200.0 / 27 = 7.41 yards. 80lb Bags = 334 bags.

You will need approximately 334 bags of 80lb premixed concrete.

Open the full interactive Concrete Calculator tool.