Concrete Sonotubes Calculator

e.g. 12 identical pier footings, or 1 slab.
Wall or column height.
Covers subgrade irregularity, spillage and over-excavation. 5-10% is normal for a formed pour on a prepared base.
Yields are from the QUIKRETE Concrete Mix No. 1101 data sheet (0.0075 cu ft of concrete per pound of dry mix).
Use the yield printed on your own bag if it differs (fast-setting, high-strength and crack-resistant mixes vary).
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.
Volume
0.4654 yd3
Concrete Calculator
Volume
12.566 ft3
Volume
0.3558 m3
Volume including waste allowance
13.823 ft3
Order this much ready-mix
0.5120 yd3
Rounded up to the quarter yard
0.75 yd3
Bags needed
24
Total weight of dry bags
1,920 lb
Weight of the finished concrete
1,885 lb
Weight of the finished concrete
0.943 ton (US short)
Weight of the finished concrete
855.0 kg
Weight of the finished concrete
0.855 t (metric)
Ready-mix truck loads
1
Finished surface area
3.14 ft2
Delivery and short-load fees
0.00 USD
Volume per element
3.1416 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.
Under one cubic yard: most ready-mix suppliers charge a short-load fee, so bagged mix is often cheaper.
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

5 steps
  1. round column: pi x (1/2 ft)^2 x 4 ft x 4 elements
  2. Volume = 12.5664 cu ft = 0.4654 cu yd = 0.3558 m3
  3. Adding 10% waste: 13.823 cu ft = 0.512 cu yd (order 0.75 cu yd)
  4. Bags: 13.823 cu ft / 0.6 cu ft per 80 lb bag = 23.04 -> 24 bags
  5. Weight: 12.5664 cu ft x 150 lb/ft3 = 1885 lb

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