Cement 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.
Only needed if you are batching from separate cement, sand and stone rather than buying concrete.
Dry loose ingredient volume needed per unit of placed wet concrete. 1.52-1.57 is standard practice.
Mass of mixing water per unit mass of cement. ACI 318-19 Table 19.3.2.1 caps w/cm at 0.50 for concrete exposed to freezing and thawing or to de-icing chemicals. Set 0 to skip the water figure.
Used only to turn the batched sand volume into a weight. 100 lb/ft3 is the US EPA table figure for dry sand; use your supplier ticket when you have one.
US EPA table figure for crushed stone is 100 lb/ft3.
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.
Cement bags (on-site mix)
5.94
Concrete Calculator
Volume
27.000 ft3
Volume
1.0000 yd3
Volume
0.7646 m3
Volume including waste allowance
27.000 ft3
Order this much ready-mix
1.0000 yd3
Rounded up to the quarter yard
1.00 yd3
Bags needed
45
Total weight of dry bags
3,600 lb
Weight of the finished concrete
4,050 lb
Weight of the finished concrete
2.025 ton (US short)
Weight of the finished concrete
1,837.0 kg
Weight of the finished concrete
1.837 t (metric)
Ready-mix truck loads
1
Cement volume (on-site mix)
5.940 ft3
Cement weight (on-site mix)
558.4 lb
Sand volume (on-site mix)
11.880 ft3
Sand weight (on-site mix)
1,188.0 lb
Coarse aggregate volume (on-site mix)
23.760 ft3
Coarse aggregate weight (on-site mix)
2,376.0 lb
Mixing water
33.47 gal (US)
Mixing water
126.69 L
Delivery and short-load fees
0.00 USD
Volume per element
27.0000 ft3
Worked out from QUIKRETE Concrete Mix No. 1101 Technical Data Sheet (bag yields, ASTM C138 density) and 6 other sources.
No waste allowance applied. Ready-mix is normally ordered 5-10% over the theoretical volume.
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. custom: 27 cu ft entered directly
  2. Volume = 27 cu ft = 1 cu yd = 0.7646 m3
  3. Bags: 27 cu ft / 0.6 cu ft per 80 lb bag = 45 -> 45 bags
  4. Weight: 27 cu ft x 150 lb/ft3 = 4050 lb
  5. On-site mix 1 : 2 : 4 (M15, ~2200 psi): dry volume = 27 x 1.54 = 41.58 cu ft, split 1:2:4 over 7 parts -> cement 5.94, sand 11.88, stone 23.76 cu ft
  6. Batch weights: cement 558.4 lb, sand 1188 lb, stone 2376 lb
  7. Water at w/c 0.5: 558.4 lb cement x 0.5 = 279.2 lb = 33.47 US gal = 126.69 L

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