Concrete Report: 20'x20'x6"


Estimated Concrete Volume
7.407 cubic yards
200 cubic feet

Estimated Weight of Concrete

13.3 tons

Covering 400 sq. ft. at 6" depth
Change dimensions

Optional 10% extra concrete
for waste allowance

10% = 0.74 cubic yards
Total Concrete with 10% = 8.15 cubic yards

Order Size

This order size is considered

How Many Concrete Bags?*

44460lb Concrete bags
33380lb Concrete bags
100Small wheelbarrow loads
50Large wheelbarrow loads
*Approximation Estimate

Concrete Truck for 20'x20' x6"

0.74 Concrete Truck Loads (10 cu/yd Capacity)

Cost Estimate for 20'x20' x6"

Purchasing ready-mix concrete is by far the easiest way to mix concrete for medium to large projects and can even be used on smaller projects as well. We have provided a cost comparison between ready mix and DIY concrete premix bags to give you a rough ballpark estimate.

Bag Cost Estimate

Pre-mixed concrete bags cost on average $3.50 per 80lb bag. Using pre-mixed bags to cover 400 sq ft at a depth of 6", the estimated cost is $1,165.50
for 333 x 80lb bags

Truck Cost Estimate

Ready-mixed concrete costs on average $108.22 per cubic yard delivered. Using a concrete truck to cover 400 sq ft at a depth of 6", the estimated cost is $801.63

Concrete trucks may also charge a "short load" fee for partially filled loads. Short load fees are charged at about $17 for every yard not used on the truck.

So for a 10 cu/yd Truck Load - 7.4 cu/yd concrete = 2.6
2.6 x $17.00 = $44.20
$801.63 + $44.20 = $845.83

Pros Do Everything*

$2,000.00$5.00 sq ft Low End**
$2,400.00$6.00 sq ft
$2,800.00$7.00 sq ft
$3,200.00$8.00 sq ft
$4,200.00$10.50 sq ft High End***

*6 inch pours and under.
**Cost assumes subbase and general prep is done.

Concrete Extras

A well-compacted subbase provides a strong foundation for concrete to lay on. We recommend you contact your nearest concrete supplier for their recommendations on whether you need a subbase, base depth, and rock type.

With a brief look, a 20x20 area at 6 inches deep, you would need approximately 10.52 tons or 7.41 cubic yards of gravel.

Concrete reinforcing is also recommended in high traffic areas and medium to large areas. Wire mesh on average costs $0.56 per sq ft and fiber mesh costs $0.13 per sq ft.

So for your 400 sq ft area, this may roughly cost $224.00 for wire mesh, $1,200.00 for thicker wire rebar mesh and $52.00 for fiber mesh.

*Reinforcing for 10 inch pours and under.
How to Calculate Concrete Amount for 20x20 x6"
20 * 20 = 400 sq ft
6 / 12 = 0.5 ft depth
400 * 0.5 = 200 cu ft
200 / 27 = 7.4074074074074
= 7.407 cu/yd
How to Calculate Concrete Weight
7.4074074074074 * 3590 = 26592.59 lbs
Density of concrete used 2130 kg/m3or 133 lbs/ft3.

20 ft x 20 ft x 6" Concrete Summary

How much concrete do I need for an area of 20 ft x 20 ft x 6" depth? 7.407 cu. yds.
How many concrete bags would I need for a 20 ft x 20 ft x 6" slab? 333 x 80lb Concrete bags.
How much does it cost to pour a 20'x20' x6" slab? Ready-mix costs approx $845.83.
How much does it cost to hire a contractor to concrete a 20'x20' x6" slab? A pro costs between $2,000.00 and $4,200.00.
How do you calculate concrete volume? Formula ((width x length) x (depth in inches / 12)) / 27 = total cubic yards. See our how to here

This Page is Calculated for the Following: 20 ft x 20 ft x 6", 20x20x6, 400 sq. ft., 20 x 20, 20x20, 20x20 x6", 20'x20'x6", 20'x20' x6"
This Concrete calculator can be used for a slab, floor, garage, block, wall, driveway, patio, countertop, footings, foundation, pool or basement, and most rectangular areas.
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Disclaimer: All calculators, tools, and results featured on are to be finalized and not be considered a quotation or binding contract.
Proofs and formulas are provided as references.