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## How to Calculate the Amount of Concrete Required

If you are planning to attempt a small DIY concrete job it is very important that you calculate the correct amount of concrete to order. Concrete is often ordered in cubic meters.

First you need to determine what the new site will be used for.

ie: Footpath, garden shed, driveway

Different concrete applications require different sizes.

Use this as a basic guide for the square and rectangle area

Footpath – 80mm thick

Small shed slab – 80mm thick

Driveway for standard size cars – 100mm

Use the formula below –

L = Length W= Width H = Height or thickness

(L) x (W) x (H)

how to run:

If the entrance is 5 meters long x 4 meters x 100mm thick

5x4x.1= 2 cubic meters of concrete required

The same formula can be used for strip footings, steps etc.

To make the concrete required in the triangular area, the formula is as follows:

1/2 = half B = base H = height

1/2 (B) x(H) this gives you square meters of area, and this square meter is the size of the tube that can work

If the triangle has a length of 5 meters and a height of 4 meters the equation would look like this

2.5×4 = 10 square meters (2.5 is half the length of the base 5)

Now that we have the square meters of the area of the triangle we can calculate the cubic meter volume

10 (sq mtrs) x.1 = 1 cubic meter

There are a few different types of concrete available. plain, colored, exposed aggregate, terrazzo, limestone, lightweight, eco concrete etc.

There are a few key factors that affect the type of concrete needed. Different applications may require more power or larger integrated sizes etc

For a standard driveway the type of concrete you would order is 25/14/80

25 = 25 MPa 14 = 14 mm thickness of aggregate 80 = 80 collapse

For footpaths the type of concrete required would be 20/14/80

Tread mix will be 25/14,20/80

During the winter or colder months the mix will also need to be a “winter mix”. Winter mix has a lower amount of accelerant in it to help speed up curing time.

During the summer a decellerant may need to be used to slow down the curing time of the concrete.

Paying careful attention to the points listed will help the DIYer not only save money on ordering concrete but also choose the right type of concrete to order.

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