Whenever you are working with cinder block you can strengthen them significantly by filling them with concrete.
How much concrete to core fill a block wall.
To estimate how much grout is needed to fill those voids you need to find the volume of each void and multiply that by the number of voids in the wall.
For smaller projects and those poured by hand some type of funnel.
Contractors elect to fill the hollow openings or voids in concrete blocks sometimes referred to as grouting after they are stacked or laid to achieve a stronger wall one with properties nearly identical to a poured concrete wall.
Concrete block also known as a concrete masonry unit and sometimes called a cinder block typically has one or two holes or voids to reduce the weight of the block.
The calculator will estimate the number of cubic yards that will be required.
16 cubic feet of concrete at 150 s is about 2400 s per block.
Given that your measurements are 2 x2 x4 the block contains about 16 cubic feet.
To use the block wall calculator simply enter the height and length of the wall click on whether you are filling an 8 inch or 12 inch wall then click on the calculate button.
Note that this is an estimate.
When reinforced with steel and filled with concrete a rock solid wall can be built to withstand the elements.