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Concrete is normally estimated in cubic metres
Convert all figures to metres and multiply
3 x 3 x 0.125 = 1.125 cubic metres
Plus 10% for shrinkage = 1.24 cubic metres
10 bags cement
0.7 cubic metres sand
0.86 cubic metres of stone
All assuming you want a strong mix
Figure 1 90 lb. bag per square ft., 6" deep.
Don't forget sand to grade and rebar to reinforce.
You probably won't find enough guys to mix all that concrete, so you'd really be better off hiring a concrete truck.
Tip: It's best to over estimate a little so you won't be caught short.
These are not the same, so cannot be directly converted.
Pounds per sq ft is a measure of pressure, while lbs / cu ft is a measure of density, weight per unit volume.
I think maybe what you are doing here is converting the weight of concrete in a 1" slab, where a sq ft would contain
1 x 1 x 1/12 = .0833 cu ft
The figure of 150 lb/ cu ft is correct for the average density of concrete, so the above slab would have
1/12 x 150 = 12.5 lbs/sq ft at 1" thickness
BTW that is a thin slab of concrete, insufficient even for a light-duty pathway. If you are referring to a screed for tiling or similar, that is cement.
Cubic meters defines volume. You must know how thick the cement will be cast to determine the volume. Therefore in this case 4 x 1.4 x thickness of the casting in meters = cubic meters required. Make sure the thickness is in meters (250 millimeters = 0.25 meters - divide millimeter by 1000 to get meters)
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