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Text excerpt: calculation formula} Formula 1: number of 1 cubic brick = (k * 2) / {wall thickness * (brick length + mortar joint) * (brick thickness + mortar joint)} formula 2 (empirical formula, must be standard brick): number of 1 cubic brick = 8 / (0.053 + mortar joint) × K / wall thickness = 1m3, net amount of brick wall mortar = 1-0.0014628 × Net amount of brick: Note: 0.0014628 = 0.24 × zero point one one five × Value of 0.053 ^ K and wall thickness ^ case: 1 Half brick 1 cubic brick number = (0.5 * 2) / {0.115 * (0.24 + 0.01) * (0.053 + 0.01)} = 552 pieces 2 Number of bricks per brick = (1 * 2) / {0.24 * (0.24 + 0.01) * (0.053 + 0.01)} = 529 pieces 3 One brick and a half 1 cubic brick number = (1.5 * 2) / {0.365 * (0.24 + 0.01) * (0.053 + 0.01)} = 522 pieces 3 Two bricks {1 cubic brick = (2 * 2) / {0.49 * (0.24 + 0.01) * (0.053 + 0.01)} = 518 pieces.