Answer

Estimated Concrete Volume

7.407 cubic yards

200 cubic feet

Estimated Weight of Concrete

## 13.3 tons

Covering 400 sq. ft. at 6" depthChange dimensions

Optional 10% extra concrete

for waste allowance

10% = 0.74 cubic yards

Total Concrete with 10% = 8.15 cubic yards

for waste allowance

10% = 0.74 cubic yards

Total Concrete with 10% = 8.15 cubic yards

## Order Size

This order size is considered

**Large**### How Many Concrete Bags?*

444 | 60lb Concrete bags |

333 | 80lb Concrete bags |

100 | Small wheelbarrow loads |

50 | Large wheelbarrow loads |

## Concrete Truck for 20'x20' x6"

74%

**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****$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

2.6 x $17.00 = $44.20

$801.63 + $44.20 =

*6 inch pours and under.

**Cost assumes subbase and general prep is done.

**$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.

2.6 x $17.00 = $44.20

$801.63 + $44.20 =

**$845.83****$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.

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/m

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/m

^{3}or 133 lbs/ft^{3}.## 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'

*x*20'

*x*6", 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.