COMPLETE GUIDE: How To Calculate Number Of Blocks To Fence One Plot Of Land (100 by 50, no pillar)

How to calculate blocks for fence

When we talk about Fencing projects, I know someone would want to wonder why fencing is very important to us. Well, fence is very important as it helps secure your plot of land from encroachment. Now I am going to write on how you could easily calculate the number of Blocks Required to Fence a Plot Of land with ease.

On this current post, I’ll be using a plot measuring 100ft by 50ft but then, it’s all the same procedure except you’ve never been a fervent reader here.
So how do we calculate the number of blocks required to fence one plot of land?
From this Post, You will get to know:
The number of bags of cement needed for this project,
Amount of sharp sand that will be required as well as the 
Number of trips of granite you’ll need
The simplest way to calculate the numbers of blocks you need for your fence project, assuming you are fencing a land measuring 100 feet by 50 ft, a standard plot 


This calculation is based on 6 inches block fence and by the time I’m done, you’ll only need to ask your engineer when he’s commencing work on your site.


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How To Calculate The Number Of Blocks To Fence One Plot Of Land


Before we start, lets understand The measurement we are using is 100 ft (length) and since we have two lengths that is multiply by 2 which is 200 ft. (10 x 2) = 200


The breadth is 50 ft and also since we have 2 breadths that equal 100 ft (50 x 2) = 100 




Then (200 + 100) that is 300 feet perimeter line fencing.





The calculation For Number a of Blocks Goes Thus


(we are to convert this 300 feet to inches ) since a foot is 12 inches , now let us multiply 12 inches by 300 ft which is 3600 inches. 




Now to get the line numbers of blocks that will go around the fence perimeters of 3600 inches or 300 feet, we would need to divide 3600 by 18 inches, since the length of any block be it 6 inches or 9 inches is 18 inches.






Now 3600 inches divided by 18 inches is approximately 200 line of blocks , then we must multiply that by the numbers of coaches of blocks you want for your height, assuming 7 ft which is 9 coaches that means 200 multiplied by 9 which is 1800 blocks and that is all you need anything aside from this is fake and fraud.


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Note: Its always recommended that you make an allowance by adding 10% of the total number of blocks to cater for breakages but you can still decide to work with just 1800 since I know we didn’t leave space for joints.
Now let’s consider other things
Now that we’ve known the number of blocks required to fence a plot of land, the next question would focus on ascertaining the number of bags of cement that would enable us bond the 1800 blocks calculated above.




In our normal English we call the act of bonding Setting of block




By standard, it is required that a bag of cement be used for 70 blocks (it could be lower if you’re using hollow blocks)


Therefore, for 1800 blocks, you’ll need 1800/70 = 25.71 bags of cement or approximately 26 bags of cement.
Note: This highly depends on the mix ratio used for mortar. Mix ratio could differ, it all depends on the engineer on site.
As For the number of Trips Of granite you’ll need, it all depends on what your pocket can carry.
While I recommend that granite be incorporated into the foundation concrete, it’s not compulsory that it be used. This of course depends on where you are, for a plot of land situated in a highly swampy area, casting is very compulsory, it may even be decided that reinforced concrete be used before introducing blocks.
Well, I hope I’ve been able to describe in details how to easily calculate the number of blocks required to fence your plot of land in Nigeria, especially for a 100 by 50ft plot.
Feel free to use the comment section to ask your questions. Do not forget


Recommended:  How To Calculate The Number Of Blocks Needed For Your Fence Project Measuring 100ft By 60ft


Written by admin

Hi, I'm Richard Nwachukwu! It is my job to handle the content aspect of this great organization and I'm determined to ensure you get it all right as long as you're handling a construction project in Nigeria!


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  1. Please Sir can you calculate for me the amount of blocks and cement needed to fence 70/100 plot of land (8 feet high) which has 3 bedrooms built on the land.

    • Hopefully it would be the same number of blocks if it was a 10 bedroom house or just 1 bedroom mansion…as long as the plot was only 70 X 100 at 8ft. High…

  2. Greetings. My Engr. I have a land measuring 200feet x 200feet to fence. With d calculation pattern u stated above,I have used it to get d total of blocks I needed, which is 2500 blocks and 40 bags of cement for bonding d blocks together. The ideal coaches or level is 4 coaches or levels. My question is, does it require a reinforced concrete plant at d middle of the line of each side of the land?

  3. @Seysony
    The use of Reinforced concrete on fence projects depends on a few factors

    1. Location of Fence with reference to the road. If the fence is very close to a busy road, specially that plied by heavy duty trucks/Heavy vehicular traffic, then its highly recommended that you put a column at every 6th block

    2. The nature of the soil: If the site is located on a plot with weak soil/peat or swampy area, you can use Columns also

    3. Size of the Plot: This is where I think you need most. You mentioned 200 x 200. So if you're fencing this, I think you'll need to place columns at regular intervals. The gap between each column is something that must be decided by the site engineer considering factors 1 & 2 above.

    However, if you have money, you can also use columns wherever you want it


  4. How many blocks will be required to fence 2 plots of land measuring 100ft by 60ft each, please? How many blocks will be required for the columns set at 6 blocks apart? Lastly, how many bags of cement are needed for bonding?
    Thank you.

  5. Hello there, great job with your calculations . It is very helpful. However, i wish to point out a fundamental point of note in your calculation. Your calculation was for a flat fence that had all for sides sealed. if you make a provision for a gate, then the width won't be 50×2 because the gate will take up a large chunk of the front wall. Great article sir.

  6. Introducing a pillar at 10 block span will leave a weak wall. Make a pillar every 6 blocks especially if the said plot is located close to a road way!

    6 blocks will be strong but also ensure you consider the nature of the soil as some soil would require reinforcements due to weak or poor bearing capacity


  8. Good PM bro, pls can I get the estimate of fencing a 120 by 50 plot of land I try getting what it will cost me but can't figure it out. And the cost my engineer gave me is outrageous. Thanks

  9. Good day Mr Richard, pls how can you calculate the number of blocks for a fencing that have block pillars? How can you calculate the number of blocks in each block pillars? Thanks

  10. Good day Mr Richard, pls how can you calculate the number of blocks for a fencing that have block pillars? How can you calculate the number of blocks in each block pillars? Thanks

  11. Good sir well done for that great calculation you made
    But then I do oberserve that when u are doing your convertion from feet (ft) in to inches you used 12 , but. I think it should be 25.4 which will give on inches not 12

  12. Sir. I used the calculations methond mentioned above to calculate for 132 ft by 82.5 and I got 4290 blocks and 61 bags of cement, but I am finding it difficult to calacut the cement and crush stones.

  13. Am stephen in kenya I have found this very helpful ,now that am looking forward meeting my client for the same plot measuring 100x50ft ,I have the idea and knowledge .be blessed much regards

  14. Am stephen in kenya I have found this very helpful ,now that am looking forward meeting my client for the same plot measuring 100x50ft ,I have the idea and knowledge .be blessed much regards

  15. A good post. I’m glad I saw this. I now have an estimate for doing perimeter fencing for my land.

    God bless you.

  16. Please how many numbers of 5″ blocks do I need to fence a land measuring 612.012 square meters including pillars @ 6 blocks

    • 20 by 20 plot? please if you’d want us to assist you, kindly provide a survey plan of your plot of land as we work with accurate dimensions to prevent errors!

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