how much concrete is required for 2 3metre long by 1 metre high walls. With gate posts

Hi the answer to your question is you will need about 3 and a half cubic metres of concrete M.c.r direct brickwork

Do you mean the concrete foundations? It depends on the width of the wall, but a metre should do it, 2 ton of all in and 14 cement.

All depends how deep you dig your footings if you dig 450 x 450 strip with 450 x 600 where pillars are built then .5m3 would be sufficient. Set your levels 150mm below surface. Get a barrowed concrete firm in.