What surface area to a depth of 4 inches would be covered by 1 cubic meter of pea shingle?

4 inches = 100mm or 0.1m

1 cubic metre = 1m3

1/0.1 = 10 m2 (10m2 * 0.1m= 1m3)

Divide the volume available by the required depth to find the coverage area.

likewise if you know the area that has to be covered and you know the specified depth multiply one by the other (in the same units) to find the required volume.

As a rule of thumb in all construction allow approx 6% wastage on materials. This is due to inaccuracies in excavation etc.

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