21 cup ≈ 0.210714 ft³ (Imperial; in US cups: 21 US cup = 0.175456 ft³). To convert cups to cubic feet, multiply by 0.010033977: 21 × 0.010033977 = 0.210714.
How to convert cups to cubic feet
ft³ = cup × 0.010033977
- 1 cup = 0.010033977 ft³ (and 1 ft³ = 99.661376 cup).
- Multiply the amount by the factor: 21 × 0.010033977 = 0.210714.
- Answer: 21 cup ≈ 0.210714 ft³ (rounded to 6 significant figures).
Cups to Cubic Feet table
| Cups (cup) | Cubic Feet (ft³) |
|---|---|
| 16 cup | 0.160544 ft³ |
| 17 cup | 0.170578 ft³ |
| 18 cup | 0.180612 ft³ |
| 19 cup | 0.190646 ft³ |
| 20 cup | 0.20068 ft³ |
| 21 cup | 0.210714 ft³ |
| 22 cup | 0.220748 ft³ |
| 23 cup | 0.230781 ft³ |
| 24 cup | 0.240815 ft³ |
| 25 cup | 0.250849 ft³ |
| 26 cup | 0.260883 ft³ |
| cup | ft³ |
|---|---|
| 1 cup | 0.010034 ft³ |
| 5 cup | 0.0501699 ft³ |
| 10 cup | 0.10034 ft³ |
| 50 cup | 0.501699 ft³ |
| 100 cup | 1.0034 ft³ |
| 1,000 cup | 10.034 ft³ |
Good to know
The cup here is the Imperial (UK) cup: 1 cup = 0.28413 L. A US cup is 0.236588 L.
In US cups: 21 US cup = 0.175456 ft³.