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- 1). Multiply the volume by 3, then divide it by 4. For an example, let the volume be 900 cubic inches. Multiplying 900 by 3 results in 2,700, and dividing 2,700 by 4 equals 675 cubic inches.
- 2). Divide the product by pi. In this example, dividing 675 cubic inches by pi results in approximately 214.859 cubic inches.
- 3). Find the cubed root of the product of the previous step to obtain the sphere's radius. In this example, the cubed root of 214.859 cubic inches is approximately 5.989 inches.
- 4). Multiply the radius by 2 to obtain the sphere's diameter. Concluding this example, multiplying a radius of 5.989 inches by 2 results in a diameter of 11.978 inches.
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