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# How many bags of cement do I need to make 1 cubic metre of concrete?

#### December 30, 2011

Currently doing fence posts and some small concrete pads around the house so I need to self mix the concrete

I keep searching for this type of thing on the internet:

Here is a good example of what is required from Boral’s Site

From my learnings:
1 Cement 2 Sand 3 Aggregate (gravel) is too strong. 16bags (costly)
1 Cement 2.5 Sand 4 Aggregate is OK for fence posts. 13bags of cement per cubic metre.

The more cement the more costly of course so don’t over do it.

Note: These are 20kg bags of General Purpose cement.

1. Can you assist by confirming how many 40kg bags of cement do I need per cubic metre volume?

Thanks

• If itโs 13 bags of cement for 20kg bags it will be 6.5 bags of cement for 40kg bags.

• Are you sure that’s 20 kg of cement per bag james?

• I’m not sure if I understand exactly what you mean, but in Australia the standard weigh for a bag of cement is 20kg.

• How many 20kg general purpose ready mixed concrete bags do i need for .56 cubic metres

2. If it’s 13 bags of cement for 20kg bags it will be 7.5 bags of cement for 40kg bags.

3. I found from Boral 1m3 of cement you need 108 20kg bags (54-40kg) premix bags or For a one 20 kg bag equals 0.01m3.

This should be easier to understand.

• Great thanks Jarod

4. How many bags of concrete do I need for a 3.1m x 3.1m x 110mm slab?

• C’mon Allan – thats just lazy ?
3.1 x 3.1 = 9.61m2 x 0.11 = 1.05m3

James’ estimates for 1cubic meter will be close enough for your slab.

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