Cubic metres measure volume. Square feet measure floor area. To connect them you need a stacking height and a realistic allowance for gaps.
Worked example: 10 m³ of belongings
With a 2.4 m unit, we cap the usable stack height at 2 m. For a volume-only estimate with balanced packing, we use 62% efficiency.
- 10 ÷ (2 × 0.62) = about 8.1 m² before allowances.
- Add 8% safety space: about 8.7 m².
- Add 15% for occasional access: about 10.0 m².
- Divide by 0.09290304 m² per sq ft: about 108 sq ft.
- Round up to the next planning size: 125 sq ft.
That is this model’s cautious volume-only estimate. A boxes-only inventory may need less floor area because stack dimensions are known; large non-stackable furniture may need more.
Convert my volume →Why dividing by ceiling height is insufficient
Items cannot fill all room height, sofas and appliances have individual floor footprints, and an aisle removes packing space. Do not confuse an empty unit’s cubic volume with usable capacity.
Useful conversion constants
| Conversion | Exact value |
|---|---|
| 1 foot | 0.3048 metres |
| 1 square foot | 0.09290304 square metres |
| 1 cubic foot | 0.028316846592 cubic metres |
| 1 cubic yard | 0.764554857984 cubic metres |