Concrete Ready Mix Calculator

e.g. 12 identical pier footings, or 1 slab.
Slab/footing/wall/curb length, or column side.
Wall or column height.
Used only when the element is "I already know the volume".
Covers subgrade irregularity, spillage and over-excavation. 5-10% is normal for a formed pour on a prepared base.
ASCE/SEI 7 Table C3.1-1a: 150 lb/ft3 reinforced stone concrete, 144 lb/ft3 plain. Lightweight mixes run 90-120. In metric those are 2400 and 2300 kg/m3.
Normalweight concrete is 150 lb/ft3 or, equivalently, about 2400 kg/m3.
Use this instead of the price per cubic yard where concrete is sold by the cubic metre.
Flat charge the supplier adds per delivery, on top of the concrete itself.
Orders under this size attract the short-load fee below. Leave at 0 if your supplier does not charge one.
Quoted rate for forming, placing and finishing, applied to the finished surface area. Ask your contractor; rates are local.
Volume
2.9630 yd3
Concrete Calculator
Volume
80.000 ft3
Volume
2.2653 m3
Volume including waste allowance
88.000 ft3
Order this much ready-mix
3.2593 yd3
Rounded up to the quarter yard
3.50 yd3
Bags needed
147
Total weight of dry bags
11,760 lb
Weight of the finished concrete
12,000 lb
Weight of the finished concrete
6.000 ton (US short)
Weight of the finished concrete
5,443.1 kg
Weight of the finished concrete
5.443 t (metric)
Ready-mix truck loads
1
Finished surface area
80.00 ft2
Ready-mix cost
488.89 USD
Concrete material cost
488.89 USD
Delivery and short-load fees
0.00 USD
Total project cost
488.89 USD
Cost per square foot of finished surface
6.11 USD/ft2
All-in cost per cubic yard placed
150.00 USD/yd3
Volume per element
80.0000 ft3
Worked out from QUIKRETE Concrete Mix No. 1101 Technical Data Sheet (bag yields, ASTM C138 density) and 6 other sources.
Footing, wall and pier dimensions must come from a structural design or a prescriptive code table, not from a volume estimate.
Footing, wall and column dimensions must come from a design by a qualified engineer or from a prescriptive table in the code adopted locally (e.g. IRC Table R403.1). This tool quantifies concrete for dimensions you supply; it does not size structural elements.

How this is worked out

7 steps
  1. footing: 40 ft x 2 ft x 1 ft
  2. Volume = 80 cu ft = 2.963 cu yd = 2.2653 m3
  3. Adding 10% waste: 88 cu ft = 3.2593 cu yd (order 3.5 cu yd)
  4. Bags: 88 cu ft / 0.6 cu ft per 80 lb bag = 146.67 -> 147 bags
  5. Weight: 80 cu ft x 150 lb/ft3 = 12000 lb
  6. Ready-mix cost = 3.2593 cu yd x $150 = $488.89
  7. Total = material $488.89 + labour $0 + fees $0 = $488.89 ($6.11 per sq ft)

Results are general information, not financial, tax, legal, medical or engineering advice.