## How to calculate the numbers of bags of cement in the foundation of a simple bungallow from a building plan.

A prospective client first question is an estimate to know the numbers of blocks and number of bags of cement required to complete his building project.

But for this article I will write on calculating the numbers of bags of cement for a simple project of 2 bedroom bungalow. Using the plan shown below.

For this plan the total wall both internal and external is 72.5m all (check for the calculations http://buildingcontractorsecrets.com/2010/09/how-to-calculate-numbers-of-blocks-from-a-building-plan/ )

Taking the thickness of block as 150mm or 6” the foundation base is taken as 150mm(or 0.15m x 3)=450mm or 0.45m or 18”.

Now for any concrete you want to calculate, first find out the volume.

For the foundation of the plan above

450mm(breadth) x 72.5m (entire length) x 150mm(foundation base thickness)=4.894m3

Now the volume of a bag of cement is given as 0.035m3 but lets use 0.03m3 to cater for shortages.

There are two major mixture ratio for concrete 1:2:4 or 1:3:6, there are others, but we are going to base our calculations on these two. 1:2:4 means one portion of cement is mixed with an equivalent volume or ratio of two of same portion of volume of cement in sharpsand and four of same portion of volume of cement in granite. That is, if I have a cement of 1m3, then I will need to mix it with 2m3 of sharpsand and 4m3 of granite stones. However one bag of cement is calculated to be approximately two headpans of sand or granite, therefore for one bag of cement in ratio 1:2:4, you will add four headpans of sharpsand, and eight headpans of granite, this is the standard , though experience has shown that materials properties varies, hence there is always little variations in quantities used on site.

Now, for the plan above, the numbers of bags of cement needed in the concrete is simply calculated by dividing the total volume of cement in concrete by a volume of one bag which is taken as 0.03.

For total volume of cement in ratio 1:2:4, add the numbers together,1+2+4=7

Divide the volume of concrete by 7 to get the volume of cement in concrete.

i.e 4.894/7=0.7m3 for volume of cement.

Remember volume of one bag of cement is 0.03, then divide 0.7m3 by 0.03

=23 bags of cement

Also if the ratio is in 1:3:6, simply add 1+3+6=10

Divide volume of concrete by 10 to get the required volume of cement in concrete

i.e 4.894/10=0.4894 for volume of cement

Don’t forget we are taking the volume of one bag of cement as 0.03,

Then divide 0.4894m3 by 0.03m3

=16 bags of cement (this is most applicable on good and fairly stable soil.

December 29th, 2014 at 6:12 pm

I’m very happy.

February 15th, 2015 at 12:42 am

I really appreciate d writer, an any other contributions, I really appreciate u guys. . . thanx

March 24th, 2015 at 1:18 am

The presentation was perfect.And plus or minus in quantities are welcome,this small explanation will help us all. contribution acknowledge.

March 31st, 2015 at 10:48 am

Thanx Emma and keep up the good work. Pls, I wanted to ask if you could help with this. How many blocks (9″) can one lay with a bag of cement (50kg)? take the the mix ratio to be 1:4. Thanks

April 9th, 2015 at 9:45 am

Well, u guys have been wonderful so far this far. What Emma did was to establish a ground and to open the eyes of many of us professionals to know what we should know to keep moving forward in our noble profession (the building industry). And truly truly, Ifeoluwa has shown all of us that as professionals, tasking our brains d more, we can always do extra ordinarily excellent works and often come out with near perfect estimation that will engender good professional practices which will reduce d high rate of building collapse in our built environment.

For d critics, I think it’s d high time u learnt to accommodate each other and learn to work as a team as no professional working in isolation in this industry can survive.

IfeOluwa I will like to have ur contact for more personal interactions with u. Thanks ones more.

May 11th, 2015 at 9:57 am

Welcome house I must say that as a practicing civil engineer, I have also learnt one thing or d oda on did platform, kudos. Wat I do most times is to add up my volumes with 30% waste b4 calculating 4 my masts to b used and it serves me well, I think we should just try to master wat efficiently works for us and apply it, wat Eva we were taught in class were all theories, yes I know sometimes it works but its better we go with practicals, thanks. I do designs and constructs, if u need my services u can connect on 08038031417, 08099554480, 08055282254 (stoneworks Ltd)

May 20th, 2015 at 11:05 am

Thank you for this write up though it’s not 100 percent correct but at least some people have grabed something not minding their comments.Keep it up don’t be discouraged because i now a lot are benefiting.Thanks and God bless.

May 23rd, 2015 at 7:49 pm

interesting, kudos to u all

May 25th, 2015 at 11:34 pm

Of all that have been stated above, only reasonable qualified professionals will have it to understand the mathematical justification. Please all, learn to appreciate a technical work because it involves rationality and mathematics.

May 29th, 2015 at 5:43 am

Thanks for giving me an idea to overcome difficulties

June 4th, 2015 at 4:07 pm

The best way to buy cement cheap is When you buy ATC – (Authority to collect cement from Dangote factory). This is the voucher that gives you authority to go direct to the factory to buy in the name of a distributor.

You can arrange your own transport or get transport from us to your desired location. This way you get your cement at the cheapest price ever.

For example:

ATC for 300 bags of cement @ N1500 per bag = N450,000

Add Transportation to any part of Lagos = N45,000

offloading = N6,000

Other expenses = N10,000

Total = N511,000

CAN YOU BEAT THIS I CAN MAKE IT HAPPEN FOR YOU. THIS IS THE BEST OPTION FOR RESELLERS AND CONSTRUCTION COMPANIES.

OUR MODE OF PAYMENT IS EASY AND CONVENIENT. YOU PAY INTO ANY OF OUR ACCOUNT AND COLLECT ATC SAME DAY. WE ARRANGE TRANSPORT AND YOU GET YOUR CEMENT WITHIN 2-4DAYS MAX DEPENDING ON THE CUSTOMER’S LOCATION

FOR MORE ENQUIRIES CALL 07030471746

EMAIL: The best way to buy cement cheap is When you buy ATC – (Authority to collect cement from Dangote factory). This is the voucher that gives you authority to go direct to the factory to buy in the name of a distributor.

You can arrange your own transport or get transport from us to your desired location. This way you get your cement at the cheapest price ever.

For example:

ATC for 300 bags of cement @ N1500 per bag = N450,000

Add Transportation to any part of Lagos = N45,000

offloading = N6,000

Other expenses = N10,000

Total = N511,000

CAN YOU BEAT THIS I CAN MAKE IT HAPPEN FOR YOU. THIS IS THE BEST OPTION FOR RESELLERS AND CONSTRUCTION COMPANIES.

OUR MODE OF PAYMENT IS EASY AND CONVENIENT. YOU PAY INTO ANY OF OUR ACCOUNT AND COLLECT ATC SAME DAY. WE ARRANGE TRANSPORT AND YOU GET YOUR CEMENT WITHIN 2-4DAYS MAX DEPENDING ON THE CUSTOMER’S LOCATION

FOR MORE ENQUIRIES CALL 07030471746

EMAIL: patrickmiller170@yahoo.com

June 17th, 2015 at 6:38 pm

Nice Job keep it up

August 6th, 2015 at 10:11 pm

Nice lecture bro although wastage is very important you need to pay attention to it..tanx

August 18th, 2015 at 9:13 pm

You guys are soo wonderful. Just discovered this site and am very happy about your contributions. Pls keep educating us the more. God bls u

September 30th, 2015 at 9:12 am

God bless you all for enlighten me more

October 18th, 2015 at 6:51 pm

How many bags of cement will deck a 30ftby30ft? Only d decking pls

October 24th, 2015 at 12:40 pm

Good Job!