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If you are reporting a wrong figure, include the calculator page, the numbers you entered, the answer you got and the answer you expected. If you have a supplier data sheet that disagrees with our table, send it — that is the most useful kind of message we get.
Calculator requests are welcome. The site adds a material only when it has genuinely different densities, depth conventions and ordering units from the ones already covered.
This is not a supplier. We do not sell, quote for or deliver concrete, aggregate or soil, and we cannot tell you what a material costs in your area — prices vary by plant, by distance and by load size. Your local supplier can.