Concrete volume for a slab, footing or column — plus the cement bags, sand and aggregate for a nominal mix. Metric, dry-volume factor 1.54.
Dry volume = wet × 1.54 (allowing for voids). Cement bags assume a 50 kg bag ≈ 0.0347 m³. Nominal mixes are estimates — for structural concrete follow a designed mix and your engineer's spec. Add ~5–10% for wastage.