For jobs where a stronger rated concrete is needed youmay consider our high strength concrete mix for your concreting purposes.
Volume of concrete per 20kg bag.
1 cement 2 5 sand 4 aggregate is ok for fence posts.
Where a more structural concrete is required you may need to add neat cement to the premixed bag.
Number of bags density of the concrete volume of the slab weight bag.
The weight of concrete.
Concrete calculator is a quick and easy way to calculate the volume weight and number of bags of concrete you need per project.
The loss is then calculated by adding the defined to the total.
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.
Quick to set concrete 20kg bag as a guide for posts up to 1 8m in length use two 20kg bags.
13bags of cement per cubic metre.
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.
20kg bags can be bought individually or as a pallet of 70.
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.
Preparation formwork made from 25mm thick timber is commonly used to mould the concrete.
Here is the table showing the different types of concrete as well as the density or weight per cubic meter m3.
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.
One 20kg bag will cover an area of 1 1m2 to a depth of approximately 10mm.
All calculations are rounded up to the next highest whole bag.
Calculate the number of bags.
The more cement the more costly of course so don t over do it.
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.
These are 20kg bags of general purpose cement.
Or 108 x 20kg bags equates to one cubic metre of mixed concrete.
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.
This series of concrete calculators has been developed to help you plan your project.
Yields are approximate and will vary based upon placement methods equipment utilized and do not include allowance for uneven subgrade waste etc.
For each calculation you will have to know the dimensions of your object.
