Redmoon Converters 计算板材、基础、立柱、楼梯和柱洞所需的混凝土体积（yd³/m³），并算出需购买多少袋40lb/60lb/80lb/25kg装的预拌料。已内置10%损耗余量。
| 包装规格 | 所需包数 |
|---|
板／基脚： 体积 = 长 × 宽 × 深。 立柱／柱坑： 体积 = π × 半径² × 高度。 楼梯： 按累积台阶块近似计算——第 i 级台阶体积为 高度×(i×进深)×宽度，将所有台阶相加。
每袋产量： 40 lb → 0.011 yd³（0.30 ft³），60 lb → 0.017 yd³（0.45 ft³），80 lb → 0.022 yd³（0.60 ft³），25 kg → 0.0125 m³，30 kg → 0.015 m³。
10% 的损耗系数考虑了地基不平整、洒漏以及略微多订的情况——这是住宅浇筑的最佳实践。
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