Convert everything into metric first, then do your calcs. Or use an online converter.
2 cubic meters would be ample for all 6. To be more specific:
3.14159 * ((0.66666)*(0.66666)) * 5 = 6.98117 cubic feet per piling
1 cubic foot = 0.02832 cubic meter
So 0.19771 cubic metres per piling. 0.19771 * 6 = 1.18626 cubic metres.
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