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Concrete Block Calculator
Estimated number of concrete blocks needed for your project.


Disclaimer: Take the information here as-is. I make no guarantees to the accuracy of any estimates based on the information provided here, and take no responsibility for its use. Consult a quantity surveyor for complete estimates.

Land Dimensions

If your land is rectanglar in shape, enter the LENGTH and WIDTH below.
Length: unit.
Width:

If your land is not rectanglar in shape, enter the perimeter below.
A perimeter is the sum of all the sides.      Click this example ⇒⇒⇒
 Perimeter: unit.


Concrete Block Size

Length of your block:
A length of 18 inches is standard in Nigeria, whether the block is 6 inches or 9 inches thick.
The most common sizes of concrete blocks in Nigeria are: 6" (6" x 9" x 18"), and 9" (9" x 9" x 18").


Wall Height

What is the total height of your wall?
Height (meters):
Height (feet):



Result

Blocks are either:
6 inch (Thickness: 6", Height: 9", Length: 18"), or
9 inch (Thickness: 9", Height: 9", Length: 18").
In both cases, the Height is 9". It is only the thickness that is different.

Estimate of the number of concrete blocks required:

Number of coaches needed are:


Cost of Blocks

Change the prices of concrete blocks below to match prices in your area.

Price of 9 inch blocks: Naira
Price of 6 inch blocks: Naira

If you use 9 inch blocks, the total cost is: ₦....
If you use 6 inch blocks, the total cost is: ₦....


Estimated Bags of Cement

After you have acquired your concrete blocks, how much cement do you need to build your walls?

On average 40 blocks will require One bag of cement for building.
So ... blocks will require ... bags of cement.

How much is a bag of cement in your area?
Naira

Total cost (Blocks+Cement) = ₦... (for 9-inch blocks).




Summary

Your land size is: ...
Wall Perimeter is ... feet (... inches).
Number of concrete blocks per coach is ... blocks.



Molding Vs Purchasing

Note that you also have the option of molding your own blocks instead of purchasing them ready-made.

Molding your own blocks let's you control how many blocks you want per bag of cement. So instead of 35, you could go for 30, 40, 45, etc.

Also, the dimensions of each block can be changed as you see fit. For instance, since your fence is not load-bearing, you could use thinner 4 inch blocks (4" x 9" x 18") in place of 6 inch (6" x 9" x 18"). Doing so would give you 33% more blocks from the same amount of sand and cement. You end up saving 33% on the cost of blocks. On the other hand, you may decide you want a thicker fence, and so use 9" x 9" x 18". Molding your own gives you flexibility.