40.4 gal ≈ 6.486 ft³ (Imperial; in US gallons: 40.4 US gal = 5.4007 ft³). To convert gallons to cubic feet, multiply by 0.16054365: 40.4 × 0.16054365 = 6.486.
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: 40.4 × 0.16054365 = 6.486.
- Answer: 40.4 gal ≈ 6.486 ft³ (rounded to 6 significant figures).
Gallons to Cubic Feet table
| Gallons (gal) | Cubic Feet (ft³) |
|---|---|
| 39.9 gal | 6.4057 ft³ |
| 40 gal | 6.4217 ft³ |
| 40.1 gal | 6.4378 ft³ |
| 40.2 gal | 6.4539 ft³ |
| 40.3 gal | 6.4699 ft³ |
| 40.4 gal | 6.486 ft³ |
| 40.5 gal | 6.502 ft³ |
| 40.6 gal | 6.5181 ft³ |
| 40.7 gal | 6.5341 ft³ |
| 40.8 gal | 6.5502 ft³ |
| 40.9 gal | 6.5662 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: 40.4 US gal = 5.4007 ft³.