Answer
Estimated Concrete Volume
5 cubic yards
135 cubic feet
Estimated Weight of Concrete
8.98 tons
Covering 270 sq. ft. at 6" depthChange dimensions
Optional 10% extra concrete
for waste allowance
10% = 0.5 cubic yards
Total Concrete with 10% = 5.5 cubic yards
for waste allowance
10% = 0.5 cubic yards
Total Concrete with 10% = 5.5 cubic yards
Order Size
This order size is considered
Large
Large
How Many Concrete Bags?*
| 300 | 60lb Concrete bags |
| 225 | 80lb Concrete bags |
| 67.5 | Small wheelbarrow loads |
| 33.8 | Large wheelbarrow loads |
Concrete Truck for 18'x15' x6"
50%
0.5 Concrete Truck Loads (10 cu/yd Capacity)
Cost Estimate for 18'x15' 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 270 sq ft at a depth of 6", the estimated cost is $787.50
$787.50
for 225 x 80lb bags
Truck Cost Estimate
Ready-mixed concrete costs on average $108.22 per cubic yard delivered. Using a concrete truck to cover 270 sq ft at a depth of 6", the estimated cost is $541.10
5 x $17.00 = $85.00
$541.10 + $85.00 = $626.10
*6 inch pours and under.
**Cost assumes subbase and general prep is done.
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 - 5 cu/yd concrete = 55 x $17.00 = $85.00
$541.10 + $85.00 = $626.10
$626.10
Pros Do Everything*
| $1,350.00 | $5.00 sq ft Low End** |
| $1,620.00 | $6.00 sq ft |
| $1,890.00 | $7.00 sq ft |
| $2,160.00 | $8.00 sq ft |
| $2,835.00 | $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 18x15 area at 6 inches deep, you would need approximately 7.1 tons or 5 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 270 sq ft area, this may roughly cost $151.20 for wire mesh, $810.00 for thicker wire rebar mesh and $35.10 for fiber mesh.
*Reinforcing for 10 inch pours and under.How to Calculate Concrete Amount for 18x15 x6"
18 * 15 = 270 sq ft
6 / 12 = 0.5 ft depth
270 * 0.5 = 135 cu ft
135 / 27 = 5
= 5 cu/yd
How to Calculate Concrete Weight
5 * 3590 = 17950 lbs
Density of concrete used 2130 kg/m3or 133 lbs/ft3.
6 / 12 = 0.5 ft depth
270 * 0.5 = 135 cu ft
135 / 27 = 5
= 5 cu/yd
How to Calculate Concrete Weight
5 * 3590 = 17950 lbs
Density of concrete used 2130 kg/m3or 133 lbs/ft3.
18 ft x 15 ft x 6" Concrete Summary
How much concrete do I need for an area of 18 ft x 15 ft x 6" depth? 5 cu. yds.
How many concrete bags would I need for a 18 ft x 15 ft x 6" slab? 225 x 80lb Concrete bags.
How much does it cost to pour a 18'x15' x6" slab? Ready-mix costs approx $626.10.
How much does it cost to hire a contractor to concrete a 18'x15' x6" slab? A pro costs between $1,350.00 and $2,835.00.
How do you calculate concrete volume? Formula ((width x length) x (depth in inches / 12)) / 27 = total cubic yards. See our how to here
How many concrete bags would I need for a 18 ft x 15 ft x 6" slab? 225 x 80lb Concrete bags.
How much does it cost to pour a 18'x15' x6" slab? Ready-mix costs approx $626.10.
How much does it cost to hire a contractor to concrete a 18'x15' x6" slab? A pro costs between $1,350.00 and $2,835.00.
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: 18 ft x 15 ft x 6", 18x15x6, 270 sq. ft., 18 x 15, 18x15, 18x15 x6", 18'x15'x6", 18'x15' 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.
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.