640 cup ≈ 40 gal (Imperial; in US gallons: 640 cup = 48.038 US gal). To convert cups to gallons, multiply by 0.062499995: 640 × 0.062499995 = 40.
How to convert cups to gallons
gal = cup × 0.062499995
- 1 cup = 0.062499995 gal (and 1 gal = 16.000001 cup).
- Multiply the amount by the factor: 640 × 0.062499995 = 40.
- Answer: 640 cup ≈ 40 gal (rounded to 6 significant figures).
Cups to Gallons table
| Cups (cup) | Gallons (gal) |
|---|---|
| 635 cup | 39.6875 gal |
| 636 cup | 39.75 gal |
| 637 cup | 39.8125 gal |
| 638 cup | 39.875 gal |
| 639 cup | 39.9375 gal |
| 640 cup | 40 gal |
| 641 cup | 40.0625 gal |
| 642 cup | 40.125 gal |
| 643 cup | 40.1875 gal |
| 644 cup | 40.25 gal |
| 645 cup | 40.3125 gal |
| cup | gal |
|---|---|
| 1 cup | 0.0625 gal |
| 5 cup | 0.3125 gal |
| 10 cup | 0.625 gal |
| 50 cup | 3.125 gal |
| 100 cup | 6.25 gal |
| 1,000 cup | 62.5 gal |
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: 640 US cup = 33.307 gal.
The gal here is the Imperial (UK) gallon: 1 gal = 4.54609 L. A US gallon is 3.78541 L.
In US gallons: 640 cup = 48.038 US gal.