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

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#### December 30, 2011

Currently (Dec 2011) doing fence posts and some small concrete pads around the house so I need to self mix the concrete

Here is a good example of what is required from the "General Purpose Cement Product Data Sheet" on Boral's Site

From my learnings if you mix in the following shovel fulls of Cement/Sand/Aggregate you will use approximately the following bags of cement per m3 of concrete

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

# 11 Comments

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

Thanks

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

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

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

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

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

Reply
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.

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• Great thanks Jarod

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

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• 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.

Reply

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