What is the number of blocks required to complete this building?This is a common question asked by prospective home owners especially after the building design phase.It is advised you use trusted professionals for your building project. This saves you time and money. However, if you are taking charge of material procurement or just wish to confirm number of blocks required for your project, these 2 simple steps outline the process outlines the steps you need to take. A simple 1 bedroom apartment is used in this case for clarity.

These are the two basic steps: Step 1: Calculate wall areas. Step 2: Divide total wall area by area of one block.

**Step 1:**

To calculate wall areas, we will calculate the total length of walls and multiply by wall height.

Area=Length x Breadth, In this case since we are dealing with height,

Area=Length x Height

Calculate Length: Looking at figure 1,we take length of vertical walls first(from left to right), then horizontal walls(from top to bottom)

Wall 1= 8000mm , Wall2=7755mm, Wall 3=3675mm, Wall 4=4100mm, Wall 5=3900mm, Wall 6=7950mm

Wall 7=3525mm, Wall 8=5975mm, Wall 9=5600mm, Wall 10=4425mm, Wall 11=4200mm

Ground Floor Plan

Sum of all wall length is=59,105mm.

Use height of wall at 3000mm.

Rough wall area (Wall area including openings) =59105mmx3000mm= 177,315,000mm

Remember we have some wall openings at the entrance, doors and windows. We have to subtract areas for these to get the actual wall area:

We have 6 doors with measuring 900mmx2100mm: 6x900mmx2100mm= 11,340,000mm*2

We have 8 windows measuring 1200mmx1200mm: 8x1200mmx1200mm= 11,520,000mm2

We have 1 window measuring 600mmx600mm: 1x600mmx600mm= 360,000mm2

We have 1 opening measuring 3300mmx2100mm: 1x3300mmx2100mm= 6,930,000mm2

Add up all opening areas:

Opening area: (11,340,000+11,520,000+360,000+6,930,000) mm2= 30,150,000mm2

Subtract opening area from the rough wall area:

**Actual ground floor wall area:**(177,315,000-30,150,000) mm2= **147,165,000mm2**

Area of foundation walls:

Also,remember we have a foundation. The foundation area depends on the number of courses laid. For this building, we use four courses of block wall as foundation (Strip foundation). This is roughly 900mm high.

We simply multiply the perimeter of walls we got in step 1 by the height of the foundation wall. Area is still length x height. But now the height is 900mm.

Area of foundation wall: 59105mmx900mm=53,194,500mm2

**Total wall area = Ground floor wall area+Foundation wall area**

=147,165,000mm2+53,194,500 mm2= **200,359,500 mm2**

**Step 2:**

Area of one block is 225mmx450mm= 101,250mm2

Number of blocks is total wall area divided by area of one block:

Hence, number of blocks is:200,359,500/101,250= 1978.86 blocks

That’s approximately**1,980 blocks**. You may want to add a certain percentage for breakages and off-cuts. If you use good quality vibrated blocks you only need to add a little.

Wish you success on your building project.Kindly mail us on info@nigerianhouseplans.com if you need clarifications. Thank You!

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Good morning. Pls in clear terms, how do calculate for the estimate of works for a storey block of 4flats( components of 2no. 3- bedroom flat and 2no. 2- bedroom flat respectively.

Good morning, in summary calculate the total area of block work and divide by the area of one block (.45mx.224m)

Or calculate the length of one course of block work, multiply by the number of courses then subtract the number of blocks for doors and windows.

Thanks verymuch, i need more help in house calculation ,tiles, n sand,cement

Dear Ngum,for floor tiles, simply calculate total wall or floor area by multiplying the length and the breadth.sand and cement depends on the mix and will be attended to in a later post.

Thank you so much

You’re welcome

What if I want to know the number of blocks for the first course during the foundation

Dear Eben, in this case calculate the perimeter and length of walls inside and divide by . 45m which is the length of one block

Quite explanatory.

Thanks so much

nigerhouseplans,

Thanks for the article, I like the flow and detailed explanation. This will be helpful not just to those in the building industry but to clients as well.

Keep up the good work!

Thanks intellectArchitects

This is a good one

Thanks Julius

Thank you so much boss this is well understood

You are welcome bright.

I really appreciate your explanations. You are bless

Thanks for the compliment Taiwo.

That was a lovely detail explanation. At least it will really help in giving a client the back up to the number of blocks used on the site.

Need a quantity surveyor chat me up

Thanks for the compliment Arc.Kolade.

I really learnt alot. Thanks sir.

Can you give explanation on how to calculate roofing sheet

Thanks for the compliment Okike, we may do this on a later post.

I love this explanation

Thanks for the compliment Iseoluwa.

Thanks a lot

Great Builders

You’re welcome Mr.John.

Thanks

I have a more easier step.

Solution:

Total length of wall = 59.105m

Length of a block = 0.45m

Total of blocks for each course: 59.1050.45 = 131blocks approximately

Height of the wall 3m height of a block = 13.3courses + 4courses substructure = 17.3courses from fdn to roof level

Therefore, total number of blocks required =

Total number of blocks for each course multiply by the total number of courses.

i.e 131*17.3 = 2267blocks minus the blocks in the openings

Openings as calculated = 30.150m

Area of a block = 0.45*.225 = 0.10125m

Total blocks in the openings 30.1500.10125 = 298blocks

i.e 2267 — 298 = 1969blocks very close with just difference of 1980 — 1969 = 11blocks

Thanks Mr.Christopher.

Good afternoon sir, plz. I’ll need a 3 and 6 bedroom duplex plan that includes the calculations for the number of blocks, cement, rods, roofing materials, labor and other things that it’ll take to get the actual amount or close to it for its starting to finish.

Tnx in advance for your anticipated favorable responses.

Dear Duncan, this is a bill of quantities or material list. We can advise on a rough estimate prior to purchasing a plan but the BoQ may be done after plan purchase if required. Thanks.

Wow! Thanks so much for this information, it’s indeed a refresher, Bigups Nigerplans

Thanks

Lovly very very good

Thanks Adewunmi.

Whoa. This was very helpful. Thanks so much

You’re welcome Israel.

Thanks the article is really healful

You’re welcome Azeezat.

Thanks for sharing good information, how to produce concrete blocks with block making machine.

I really appreciate for the simple enlighten on buildings project.I am builder.

You’re Welcome Mr. Kayode

Very helpful ….thanks

You’re welcome Mr. Ebenezer.

These process review the details knowledge on how to calculate the amount of block in a giving project.thanks

Thank You Emmanuel.

Senior mens to study building is not an easy thing; but we thank God for giving us understanding always, pls if u dont know something ask and it shall be giving unto u

Pls what if we are to calculate the amount of blocks to be used for a wall

Maybe for 1 8000mm

Pls

Thanks guys this article was really helpful

Dear Mr.Daniel, Thanks for the compliment. Regards.