One cubic foot equals 7.4805 US gallons (or 6.2288 imperial gallons). Type any value below to convert in any direction — US gallons and UK gallons are computed simultaneously.
1 ft³ = 7.4805 US gal · 1 ft³ = 6.2288 UK gal · 1 US gal = 0.8327 UK gal
Looking for conversions beyond volume? Our sister site unitcheatsheet.com covers length, weight, area, temperature, energy, and other unit systems — with the same philosophy of clear formulas, no signups, and instant results.
Visit unitcheatsheet.com →A cubic foot is a cubic foot worldwide — that part is universal. But "gallon" means different things on either side of the Atlantic:
The UK gallon is about 20% larger than the US gallon. This is one of those unit-conversion gotchas that's responsible for a lot of pool-chemistry mistakes and recipe confusion. If you don't know which gallon, look at the source — UK pool guides and old British plumbing specs use imperial; everything else in the US is American gallons.
For shipping: cubic feet is the standard for US freight; in international freight you'll see CBM (cubic meters) instead. See our CBM calculator for international shipping.
→ Calculate a box's volume in ft³ and gallons
→ Pool volume calculator (gallons)
→ Cubic feet to gallons: full guide
| ft³ | US gal | UK gal |
|---|---|---|
| 1 | 7.48 | 6.23 |
| 5 | 37.4 | 31.1 |
| 10 | 74.8 | 62.3 |
| 25 | 187 | 156 |
| 50 | 374 | 311 |
| 100 | 748 | 623 |
| 500 | 3,740 | 3,114 |
| 1,000 | 7,481 | 6,229 |