The breeze block is a popular building material because it is relatively inexpensive and easy to install in most cases. It is also a versatile material in that it can be used for many different types of projects. These characteristics also make it attractive to the do-it-yourself homeowner, but they are often not experienced in planning the project and knowing how much block to order. If you are planning on doing some work with breeze blocks, you will want to know how to calculate the amount of blocks you will need.
Calculate the number of blocks needed for a specific length of a project (we will call this value "L") by first taking the length of the block you will be using. For example, for a standard 20 x 40 cm (8 inch x 16 inch) face block, divide the 40 cm (16 inch) length by 100 to get 0.4. We will call this value "l", the length of the block in metres.
Divide the value L by the value l to get the number of blocks needed. If you were needing block for a 30 m (100 foot) distance, then the equation would be as follows. L/l = 30/0.4 = 75 blocks.
Convert the height of the block to metres (we'll call this "h") if you have a project that requires the block also be stacked to reach a certain height. Again, for an example of standard face block that is 20 cm (8 inches) high, divide this by 100 to get a value of 0.2.
Divide the desired height of the project (call this value "H") by the value h from the step above. For example, if you want your project to be 1.2 m (4 feet) high, then calculate as follows. H/h = 1.2/0.2 = 6 blocks. Your project will need six rows of blocks to reach the desired 1.2 m (4 feet) height.
Calculate the total number of concrete blocks needed for a wall by multiplying the number of blocks needed for the desired length of the project by the number of blocks to reach the desired height. In our example, it would look as follows. (75 blocks for the length) x (6 blocks height) = 450 blocks.