At least 3 cubic yards for a 4-inch slab. You'll need 4.75 cubic yards for a 6-inch slab.
An 80lb bag of concrete you can at your local home improvement store covers about 4 square foot at 2" thick. So you would need about 144 bags of 80lb concrete.
It depends how thick you want it
You will need at least 14 cubic yards.
For a 4-inch depth you will need at least 7 cubic yards.
Well assuming the depth of concrete is going to be 1 meter you will need 846 cubic meters of concrete.
you would need 37.33 yards of concrete or 38 to be safe
An 80lb bag of concrete you can at your local home improvement store covers about 4 square foot at 2" thick. So you would need about 144 bags of 80lb concrete.
For a hole 36" deep X 18" diameter, you would need approx. 1/5 cu. yd. concrete.
You need the dimensions of the column to calculate the volume. The formula would need to include the three dimensions in some form.
1 cubic yd of a concrete mixture contains about 500 hundred lbs of cement
It depends how thick you want it
For a 4-inch depth you will need at least 7 cubic yards.
You will need at least 14 cubic yards.
An 80 pound bag of premix concrete will make .6 cubic feet of cured concrete. There are 27 cubic feet in a cubic meter, so it would take 45 80 pound bags to make one cubic meter.
Need a little more info. How wide & thick a slab? How many steps, how tall do you want the steps? All helps determines Cubic Feet of concrete needed. I would use 5000psi concrete with fiber, it lessenes