Foundation cement

Just asking for some very rough quotes for the cost of cement at 
http://www.toupie-beton.net/article/dosage-beton-14

Assuming we have a depth of 60cm (this is only guess work at the moment), we have an external wall footprint of 8m x 10m

Assuming the concrete base major support area is 1m deep (it will be less that this).

That gives us (for a 1 metre depth)

8 m cubed+ 8m cubed+ 9m cubed+ 9m cubed.

= 34 metres cubed of cement for 1 m depth.

So for 0.6 metres depth we need 20.4 m cubed. I filled out the form on the above site as below so am waiting quotes.