Quick to set concrete 20kg bag as a guide for posts up to 1 8m in length use two 20kg bags.
Volume of concrete per 20kg bag.
The addition of 1 6 1 8 litres of water to a 20kg bag of hi strength 36 will produce around 11 5 litres of concrete.
1 cement 2 5 sand 4 aggregate is ok for fence posts.
The weight of concrete.
Perfect for slabs walls columns tubes curbs and stairs just to name a few.
Here is the table showing the different types of concrete as well as the density or weight per cubic meter m3.
The calculator will indicate the estimated number of 25 kg or 30 kg bags of quikrete concrete mix needed to build a 3 4 or 6 slab with a typical waste factor.
These are 20kg bags of general purpose cement.
For jobs where a stronger rated concrete is needed youmay consider our high strength concrete mix for your concreting purposes.
For each calculation you will have to know the dimensions of your object.
The calculator will perform the sums for you where relevant it will add a small percentage for the wastage that inevitably happens when mixing using.
Yields are approximate and will vary based upon placement methods equipment utilized and do not include allowance for uneven subgrade waste etc.
Concrete calculator is a quick and easy way to calculate the volume weight and number of bags of concrete you need per project.
The more cement the more costly of course so don t over do it.
The loss is then calculated by adding the defined to the total.
Where a more structural concrete is required you may need to add neat cement to the premixed bag.
One 20kg bag will cover an area of 1 1m2 to a depth of approximately 10mm.
This series of concrete calculators has been developed to help you plan your project.
Or 108 x 20kg bags equates to one cubic metre of mixed concrete.
Pre mix concrete bag calculator calculated at 2160 kg per 1m allow extra for waste cubic metres 20 kg bags 25 kg bags 30 kg bags 40 kg bags per bag.
As a guide an addition of 1kg to 1 5kg per 20kg bag of concrete mix can be used to achieve around 32 mpa concrete under normal conditions.
You can use this concrete calculator to help you determine the number of bags of quikrete concrete mix mortar mix or fast setting concrete you will need for the following projects.
13bags of cement per cubic metre.
Calculate the number of bags.
Number of bags density of the concrete volume of the slab weight bag.
You can calculate how much concrete cement sand mortar or render you will need.
20kg bags can be bought individually or as a pallet of 70.
