Estimated Concrete Volume
6 cubic yards
162 cubic feet
Estimated Weight of Concrete
10.77 tonsCovering 324 sq. ft. at 6" depth
10% = 0.6 cubic yards
Total Concrete with 10% = 6.6 cubic yards
How Many Concrete Bags?*
|359||60lb Concrete bags|
|270||80lb Concrete bags|
|81||Small wheelbarrow loads|
|40.5||Large wheelbarrow loads|
Concrete Truck for 18'x18' x6"
Cost Estimate for 18'x18' x6"
Bag Cost Estimate
Truck Cost Estimate
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 - 6 cu/yd concrete = 4
4 x $17.00 = $68.00
$649.32 + $68.00 = $717.32
Pros Do Everything*
|$1,620.00||$5.00 sq ft Low End**|
|$1,944.00||$6.00 sq ft|
|$2,268.00||$7.00 sq ft|
|$2,592.00||$8.00 sq ft|
|$3,402.00||$10.50 sq ft High End***|
*6 inch pours and under.
**Cost assumes subbase and general prep is done.
With a brief look, a 18x18 area at 6 inches deep, you would need approximately 8.52 tons or 6 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 324 sq ft area, this may roughly cost $181.44 for wire mesh, $972.00 for thicker wire rebar mesh and $42.12 for fiber mesh.*Reinforcing for 10 inch pours and under.
6 / 12 = 0.5 ft depth
324 * 0.5 = 162 cu ft
162 / 27 = 6
= 6 cu/yd
How to Calculate Concrete Weight
6 * 3590 = 21540 lbs
Density of concrete used 2130 kg/m3or 133 lbs/ft3.
18 ft x 18 ft x 6" Concrete Summary
How many concrete bags would I need for a 18 ft x 18 ft x 6" slab? 270 x 80lb Concrete bags.
How much does it cost to pour a 18'x18' x6" slab? Ready-mix costs approx $717.32.
How much does it cost to hire a contractor to concrete a 18'x18' x6" slab? A pro costs between $1,620.00 and $3,402.00.
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 Concrete calculator can be used for a slab, floor, garage, block, wall, driveway, patio, countertop, footings, foundation, pool or basement, and most rectangular areas.