Cubic Feet to Gallons Converter
Convert cubic feet to US liquid, UK/Imperial, and US dry gallons plus liters and cubic meters in one interface.
How to use this converter
Switch between cubic feet to gallons and gallons to cubic feet, choose the gallon variant, and enter the numeric value you need. Click Calculate to refresh the summarized results instantly or let the inputs auto-update while you type.
This converter relies on the official NIST factors for US liquid gallons, UK/Imperial gallons, and US dry gallons. All conversions originate from exact cubic foot relationships and then propagate into liters and cubic meters so you can trust the ratios used in the interface.
- The default tab assumes 1 cubic foot equals 7.480519 US liquid gallons.
- Switching to Imperial or dry gallons keeps the same cubic foot source and simply swaps the factor.
- Results always trim trailing zeros for clarity (no NaN or Infinity will appear even when inputs are blank).
Quick table: cubic feet → US gallons
| ft³ |
US gal |
| 1 | 7.4805 |
| 2 | 14.9610 |
| 5 | 37.4026 |
| 10 | 74.8052 |
| 20 | 149.6104 |
FAQ
1. How many gallons of water in a 2 ft × 2 ft × 2 ft cube?
Its volume is 8 ft³. Multiply 8 × 7.480519 to get roughly 59.844 gallons (US liquid).
2. Why do some sites show slightly different numbers?
Different sources round at varying decimal places. This tool sticks to the NIST exact factors (231 in³ per US gallon and the defined foot-to-meter conversion) so you always know the ratio you are applying.
3. Can I use this for water utility calculations?
Yes. Many utilities bill in cubic feet (CCF = 100 ft³), while customers think in gallons. This converter keeps the multiplier precise so you can reconcile the bill with gallons-based planning.
Full original guide (expanded)
Convert manually by multiplying ft³ by the gallon factor or dividing gallons by that same factor. Estimate pool volume by multiplying pool dimensions in feet to get cubic feet before applying the conversion.
Check water bills by remembering that 1 CCF = 748.0519 US gallons, so 12 CCF equals about 8,976 gallons. Always verify the gallon type used by your meter (US liquid vs US dry vs Imperial) in international or agricultural contexts.
Add here long-form explanation for SEO: how to convert ft³ to gallons by hand, how to estimate pool volume, and how to check against the water bill (1 CCF = 748.0519 US gal).
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Utility / plumbing notes
- 1 CCF (100 ft³) equals 748.0519 US gallons.
- Confirm gallon type in international, agricultural, or engineering work.
- Round to 2–3 decimals when preparing billing or specifications.