The volume of a cylinder = (radius x radius) x 3.14 x height in feet.įor a ten-foot circle, your calculator would look like this: In this example, your project would need 1.2 tons of rock.Ĭircular areas require a bit more calculation. River rock weighs about 2,600 pounds or 1.3 tons per cubic yard. Divide 25 by 27 to reach 0.93 cubic yards. Multiply 0.25 by 100 and your volume is 25. Divide three inches by 12 to reach 0.25 feet. Multiply 10 by 10 to reach 100 square feet. Imagine that you wish to cover a 10-foot x 10-foot area with 3-inch river rock. To put this formula to practical use, follow this example. This final number is how many cubic yards of material you will need. The river rock calculator formula for rock under three inches is as follows:
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