To estimate how many blocks you ll need per row divide the total length of the wall by the length of the block.
How to estimate concrete retaining wall.
Depending on the typical climate for your location your retaining wall should have around 12 of gravel right behind the entire width and height of your wall to facilitate proper drainage.
Here i have divided the retaining wall into two parts part a is the base slab and part b is the stem of retaining wall.
Use our block fill calculator to estimate the fill volume.
To simplify the process use our paver calculator to find out how many blocks you ll need.
Now we have to calculate the volume of concrete in retaining wall and raft foundation.
Volume of base slab l x b x h 10 x 3 x 0 2 6 m.
Retaining walls footings or any other volume of concrete.
For example you can estimate a 10 wide by 2 high retaining wall and observe the materials required.
Width 900mm from bottom 300mm from top.
To calculate the volume of retaining wall we need to calculate the volume of retaining wall.
To figure out how many rows you ll need divide the ideal wall height by the height of the block.
Enter the height feet.
Enter the thickness inches.
Finally divide cubic inches by 46 656 to find cubic yards of concrete needed.
Volume length x average width x height 10 x 0 9 0 3 2 x 5 30 cum.
At lowe s we have several retaining wall block options to choose from.
Retaining wall block options.
Input length and width of the area.
For retaining wall.
Multiply the cubic inches by the number of voids in the wall typically 2 per block.
If the wall is l feet long h feet high and t inches thick then the trench needs to be l feet long 0 12h feet deep and 2t inches wide.
Estimate the amount of gravel needed to pack the trench at the base of the retaining wall.
Make sure to account for the first row being half buried.
Concrete is ordered by volume in cubic yards.
To calculate the volume of concrete in retaining wall we have to find out the following things from drawings.
Multiply the width and height of your retaining wall by 12 to give the total cubic feet of backfill gravel that will need to be ordered.
How many retaining wall blocks do you need.
Enter length and height in feet and thickness in inches.
The calculator will automatically estimate the number of cubic yards of concrete that will be required.
Click the button to calculate the volume of concrete and man hours not including mixing needed for this job.
V l x h x t.
So volume of retaining wall volume of base slab volume of stem.
This calculator is to be used as an estimating tool only.
If you re building a concrete block wall then check out our concrete block calculator.
To use the concrete wall calculator simply enter the width length and thickness of your pour.