138 gal ≈ 22.155 ft³ (Imperial; in US gallons: 138 US gal = 18.4479 ft³). To convert gallons to cubic feet, multiply by 0.16054365: 138 × 0.16054365 = 22.155.
How to convert gallons to cubic feet
ft³ = gal × 0.16054365
- 1 gal = 0.16054365 ft³ (and 1 ft³ = 6.2288355 gal).
- Multiply the amount by the factor: 138 × 0.16054365 = 22.155.
- Answer: 138 gal ≈ 22.155 ft³ (rounded to 6 significant figures).
Gallons to Cubic Feet table
| Gallons (gal) | Cubic Feet (ft³) |
|---|---|
| 133 gal | 21.3523 ft³ |
| 134 gal | 21.5128 ft³ |
| 135 gal | 21.6734 ft³ |
| 136 gal | 21.8339 ft³ |
| 137 gal | 21.9945 ft³ |
| 138 gal | 22.155 ft³ |
| 139 gal | 22.3156 ft³ |
| 140 gal | 22.4761 ft³ |
| 141 gal | 22.6367 ft³ |
| 142 gal | 22.7972 ft³ |
| 143 gal | 22.9577 ft³ |
| gal | ft³ |
|---|---|
| 1 gal | 0.160544 ft³ |
| 5 gal | 0.802718 ft³ |
| 10 gal | 1.6054 ft³ |
| 50 gal | 8.0272 ft³ |
| 100 gal | 16.0544 ft³ |
| 1,000 gal | 160.544 ft³ |
Good to know
The gal here is the Imperial (UK) gallon: 1 gal = 4.54609 L. A US gallon is 3.78541 L.
In US gallons: 138 US gal = 18.4479 ft³.