· For instance, if you are using four inches of crushed stone under a patio area or for a driveway, four inches converted to feet is .33. So, our calculation is .33 x 200 ÷ 27, or cubic yards. Circular Areas. Circular areas require a little more math to yield exact measurements. If you're happy with an approximation, you can measure the diameter in two directions, multiply those as you ...
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