Answer

Estimated Concrete Volume

1.556 cubic yards

42 cubic feet

Estimated Weight of Concrete

## 2.79 tons

5584.44 pounds

Covering 84 sq. ft. at 6" depthChange dimensions

Optional 10% extra concrete

for waste allowance

10% = 0.16 cubic yards

Total Concrete with 10% = 1.71 cubic yards

for waste allowance

10% = 0.16 cubic yards

Total Concrete with 10% = 1.71 cubic yards

## Order Size

This order size is considered

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

94 | 60lb Concrete bags |

70 | 80lb Concrete bags |

21 | Small wheelbarrow loads |

10.5 | Large wheelbarrow loads |

## Concrete Truck for 7'x12' x6"

16%

**0.16 Concrete Truck Loads**(10 cu/yd Capacity)

## Cost Estimate for 7'x12' 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 84 sq ft at a depth of 6", the estimated cost is

**$245.00****$245.00**

for 70 x 80lb bags

## Truck Cost Estimate

Ready-mixed concrete costs on average $108.22 per cubic yard delivered. Using a concrete truck to cover 84 sq ft at a depth of 6", the estimated cost is

8.4 x $17.00 = $142.80

$168.34 + $142.80 =

*6 inch pours and under.

**Cost assumes subbase and general prep is done.

**$168.34**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.

8.4 x $17.00 = $142.80

$168.34 + $142.80 =

**$311.14****$311.14**

### Pros Do Everything*

$420.00 | $5.00 sq ft Low End** |

$504.00 | $6.00 sq ft |

$588.00 | $7.00 sq ft |

$672.00 | $8.00 sq ft |

$882.00 | $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 7x12 area at 6 inches deep, you would need approximately **2.21 tons** or **1.56 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 **84 sq ft area**, this may roughly cost **$47.04** for wire mesh, **$252.00** for thicker wire rebar mesh and **$10.92** for fiber mesh.

How to Calculate Concrete Amount for 7x12 x6"

7 * 12 = 84 sq ft

6 / 12 = 0.5 ft depth

84 * 0.5 = 42 cu ft

42 / 27 = 1.5555555555556

= 1.556 cu/yd

How to Calculate Concrete Weight

1.5555555555556 * 3590 = 5584.44 lbs

Density of concrete used 2130 kg/m

6 / 12 = 0.5 ft depth

84 * 0.5 = 42 cu ft

42 / 27 = 1.5555555555556

= 1.556 cu/yd

How to Calculate Concrete Weight

1.5555555555556 * 3590 = 5584.44 lbs

Density of concrete used 2130 kg/m

^{3}or 133 lbs/ft^{3}.## 7 ft x 12 ft x 6" Concrete Summary

**How much concrete do I need for an area of 7 ft x 12 ft x 6" depth?**1.556 cu. yds.

**How many concrete bags would I need for a 7 ft x 12 ft x 6" slab?**70 x 80lb Concrete bags.

**How much does it cost to pour a 7'x12' x6" slab?**Ready-mix costs approx $311.14.

**How much does it cost to hire a contractor to concrete a 7'x12' x6" slab?**A pro costs between $420.00 and $882.00.

**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:**7 ft x 12 ft x 6", 7x12x6, 84 sq. ft., 7 x 12, 7x12, 7x12 x6", 7'

*x*12'

*x*6", 7'x12' 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.