Cement Mix Calculator

e.g. 12 identical pier footings, or 1 slab.
Slab/footing/wall/curb length, or column side.
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.
Cement bags (on-site mix)
8.07
Concrete Calculator
Volume
33.333 ft3
Volume
1.2346 yd3
Volume
0.9439 m3
Volume including waste allowance
36.667 ft3
Order this much ready-mix
1.3580 yd3
Rounded up to the quarter yard
1.50 yd3
Bags needed
62
Total weight of dry bags
4,960 lb
Weight of the finished concrete
5,000 lb
Weight of the finished concrete
2.500 ton (US short)
Weight of the finished concrete
2,268.0 kg
Weight of the finished concrete
2.268 t (metric)
Ready-mix truck loads
1
Cement volume (on-site mix)
8.067 ft3
Cement weight (on-site mix)
758.3 lb
Sand volume (on-site mix)
16.133 ft3
Sand weight (on-site mix)
1,613.3 lb
Coarse aggregate volume (on-site mix)
32.267 ft3
Coarse aggregate weight (on-site mix)
3,226.7 lb
Mixing water
45.45 gal (US)
Mixing water
172.05 L
Finished surface area
100.00 ft2
Delivery and short-load fees
0.00 USD
Volume per element
33.3333 ft3
Worked out from QUIKRETE Concrete Mix No. 1101 Technical Data Sheet (bag yields, ASTM C138 density) and 6 other sources.
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

8 steps
  1. slab: 10 ft x 10 ft x 0.3333 ft
  2. Volume = 33.3333 cu ft = 1.2346 cu yd = 0.9439 m3
  3. Adding 10% waste: 36.6667 cu ft = 1.358 cu yd (order 1.5 cu yd)
  4. Bags: 36.6667 cu ft / 0.6 cu ft per 80 lb bag = 61.11 -> 62 bags
  5. Weight: 33.3333 cu ft x 150 lb/ft3 = 5000 lb
  6. On-site mix 1 : 2 : 4 (M15, ~2200 psi): dry volume = 36.667 x 1.54 = 56.467 cu ft, split 1:2:4 over 7 parts -> cement 8.067, sand 16.133, stone 32.267 cu ft
  7. Batch weights: cement 758.3 lb, sand 1613.3 lb, stone 3226.7 lb
  8. Water at w/c 0.5: 758.3 lb cement x 0.5 = 379.1 lb = 45.45 US gal = 172.05 L

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