Sunday, 1 September 2019

Tutorial: How to Calculate Materials Required to Mold 3500 Blocks (solid only)

how to calculate materials required for 3500 blocks

One thing about spending less cash when you are handling a building project is knowing what is required, in what quantity and quality and then having the right hands to handle these without wasting much or any at all. For this reason, i will be Discussing on How to Calculate Materials Required to Mold 3500 Blocks.

On this article, i will be using a 6 Inch block as case study, this is because i see a lot of builders using 6 inches blocks except those building anything above a storey building.  Do not forget that in a building project, you're faced with making decisions such as whether or not to buy or mold your own blocks.

Whether you buy from block industries or mold your own blocks, do not forget to ensure the blocks are strong enough to provide you the strength required as prescribed by the standards in your country.


In Nigeria, a 6 Inch Block (450mm x 150mm x 225mm) is used in various aspects of building construction. Some builders actually use it for septic tank construction also.

Properties of 6 Inch Block


A 6 inch block has a length of 450mm, 
it is 150mm wide and 
225mm high

Having known the properties of a 6 inch block, lets talk about the materials required to mold at least 35 pieces of it.

Note: Number of Blocks = 35 pieces
Standard: 1 Bag Of Cement To Produce 35 blocks (Solid only)

How to Calculate the Volume of a 6 Inch block (Solid Only)


In order to be able to calculate the volume of a 6 inch solid block, we need to understand its dimensions 

Length = 450mm (0.45m)
Width  = 150mm (0.15m)
Height = 225mm (0.225m)

Now we quickly multiply all the dimensions in order to obtain the volume of 1 6 inch solid block


Volume of Block = (0.45 x 0.15 x 0.225) = 0.0152m3


Next we estimate the volume of all 35 blocks we are required to make by multiplying the volume of each block by 35

Therefore, the volume of 35 6 inch blocks would be 
(35 x 0.0152) = 0.535m3

Having known the volume of all 35 solid 6 inches block, lets now calculate the volume of sand required to make these blocks

How to Calculate the Volume of Sand required for 35 solid 6 inch Blocks


The Mass (M) of 1 bag of cement is 50kg Right?
The density (D) of a bag of cement is 1440kg/m3 right?
Lets assume the Volume (V) is unknown and marked x

But Density = Mass/Volume

D = M/V (kg/m3)

Where D = 1440kg/m3
      M = 50kg
      V = ?

Therefore 1440 = 50/v

1440v = 50

v = 50/1440

So V = 0.034m3

The Volume of a bag of cement is 0.034m3


Because we are still on site and may not have all necessary equipment at hand, i will like to make it clear that the volume of a wheelbarrow is 0.065m3 (unheaped). 

But it takes 2 x 50kg bags of cement to fill a wheelbarrow.

So how many wheelbarrows of sand is required to make 35 blocks from a bag of cement?

lets not forget that the total volume of 35 blocks is 0.535m3
lets assume the number of wheelbarrows of sand required is x

Therefore, we will need (1 bag of cement) + (total volume of sand) to make a total volume of blocks required

but Volume of bag of cement = 0.0347
Volume of sand required = x(0.065)
volume of 35 blocks = 0.535

Therefore, (0.0347) + x(0.065) = 0.535

x(0.065) = (0.535 - 0.0347) = 0.5003

0.065x = 0.5003

x = 0.5003/0.065

x = 7.7 unheaped wheelbarrows of sand

Therefore the volume of sand required for 35 solid 6 inches blocks = 7.7 x 0.065 = 0.0500

Therefore, in order to make 35 6 inches blocks, you'll need

1. 1 Bag of cement (50kg)

2. 7.7 wheelbarrow trips of sand or 0.50m3

But what if you had need for 3500 blocks?

So if you had to make 3500 blocks, here are the materials you'll need

Remember that it takes 0.50m3* of sand for 35 blocks

This means you will need (3500/35) x 0.50 = 50m3 of sand (about 13 trips of sand for 3500 solid 6 inches blocks)

Since a bag of cement makes 35 blocks, you will need 100 bags to come up with 3500 blocks

Well, from this post on How to Calculate Materials Required to Mold 3500 Blocks, we have been able to show the steps to calculate the volume of sand required to make 35 6 inch solid blocks which we accomplished by first calculating the volume of each block.

We also calculated the quantity of sand required for the  35 blocks as well as that required for 3500 blocks.

Having studied How to Calculate Materials Required to Mold 3500 Blocks, i therefore put it to you that you can estimate the materials to required to make as many blocks as you'll require for any building project with a few exceptions!



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