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Understanding Mold Volume To calculate the volume of your mold, use this formula: Volume = π x radius x radius x length x 0.4 Here, π (pi) is approximately 3.14. The radius for a 3-inch mold is 1.5 inches. Mold Size Capacities I offer three different mold sizes for your soap-making needs. 8-Inch Mold: This mold can hold 22.608 ounces. The calculation is as follows: 3.14 x 1.5 x 1.5 x 8 x 0.4 = 22.608 ounces. 10.5-Inch Mold: This mold has a capacity of 29.673 ounces. The ca