A cubic foot is exactly 0.028316846592 cubic meters.
Cubic feet to Imperial gallons Converter — ft3 to imp gal
Convert Cubic foot (ft3) to Imperial gallon (imp gal) using the exact conversion factor (1 cubic foot = 6.228835459 imperial gallon). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Cubic feet to Imperial gallons converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
An imperial gallon is exactly 4.54609 liters.
Result = input x 0.02831684659 / 0.00454609.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cubic feet to Imperial gallons
Cubic foot and Imperial gallon appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Cubic foot is typically associated with united States (construction, HVAC, natural gas billing), while Imperial gallon is typically associated with united Kingdom, Canada (some contexts), and other Commonwealth countries.
Formula
imperial gallons = cubic feet × 6.22883545904
This factor comes from each unit's defined relationship to the category's base unit: 1 cubic foot equals 0.028316846592 base units, and 1 imperial gallon equals 0.00454609 base units, so dividing one by the other gives the direct cubic foot-to-imperial gallon factor of 6.22883545904.
Simple example
1 ft3 × 6.228835459 = 6.228835459 imp gal
1 cubic foot = 6.228835459 imperial gallons.
Real-world example
10 ft3 × 6.228835459 = 62.28835459 imp gal
10 cubic feet = 62.28835459 imperial gallons.
Conversion table
| Cubic foot (ft3) | Imperial gallon (imp gal) |
|---|---|
| 1 ft3 | 6.228835459 imp gal |
| 5 ft3 | 31.1441773 imp gal |
| 10 ft3 | 62.28835459 imp gal |
| 25 ft3 | 155.7208865 imp gal |
| 50 ft3 | 311.441773 imp gal |
| 100 ft3 | 622.8835459 imp gal |
Reverse conversion: Imperial gallon to Cubic foot
6.228835459 imp gal × 0.1605436532 = 1 ft3
6.228835459 imperial gallons = 1 cubic feet.
cubic feet = imperial gallons × 0.160543653236
For a page dedicated to this direction, see Imperial gallon to Cubic foot.
Cubic foot vs. Imperial gallon
| Aspect | Cubic foot | Imperial gallon |
|---|---|---|
| Family | US/imperial customary unit | UK/imperial customary unit |
| Typical use | US natural gas utility billing (often in hundreds or thousands of cubic feet) | UK fuel and beverage measurement (historically; UK now primarily uses liters for retail) |
| Where it's used | United States (construction, HVAC, natural gas billing) | United Kingdom, Canada (some contexts), and other Commonwealth countries |
Understanding the Cubic foot
Cubic foot (ft3) measures volume. A cubic foot is exactly 0.028316846592 cubic meters, derived from the 1959 international foot. It is classified as a US/imperial customary unit.
Where it's used: United States (construction, HVAC, natural gas billing)
Uses of the Cubic foot today
- US natural gas utility billing (often in hundreds or thousands of cubic feet)
- HVAC airflow and building-volume calculations
- Lumber, concrete, and construction material estimation in the US
History of the Cubic foot
The cubic foot, like the square foot, follows from the standardized foot (exactly 0.3048 m since the 1959 international agreement) rather than having a separate historical definition.
Historical origin. Cubic foot was not the invention of a single named person; it developed through the process described above.
Understanding the Imperial gallon
Imperial gallon (imp gal) measures volume. The imperial gallon is defined as exactly 4.54609 liters, about 20% larger than the US gallon. It is classified as a UK/imperial customary unit.
Where it's used: United Kingdom, Canada (some contexts), and other Commonwealth countries
Imperial gallon vs. US gallon. Britain's 1824 Weights and Measures Act defined a new gallon based on 10 pounds of water, replacing the old wine gallon the US had already adopted — leaving the US (3.785 L) and imperial (4.546 L) gallons about 20% apart today.
Uses of the Imperial gallon today
- UK fuel and beverage measurement (historically; UK now primarily uses liters for retail)
- Commonwealth country liquid measurement in some contexts
History of the Imperial gallon
The imperial gallon was created by Britain's Weights and Measures Act of 1824, defined as the volume of 10 pounds of water, replacing several inconsistent older English gallon definitions (wine gallon, ale gallon, corn gallon) with one standard.
Historical origin. Imperial gallon was not the invention of a single named person; it developed through the process described above.
Cubic foot — sources
- NIST — International yard and pound (1959) — Basis for the modern foot and its derived volume unit.
Imperial gallon — sources
- UK Weights and Measures Act 1824 — Establishes the imperial gallon definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many imperial gallons are in 1 cubic foot?
1 cubic foot equals 6.228835459 imperial gallons, using the exact defined conversion factor rather than an estimate.
How do I convert cubic foot to imperial gallon?
Multiply the cubic foot value by 6.228835459. The converter above does this instantly to whatever precision you set.
How do I convert imperial gallon back to cubic foot?
Use the reverse factor: 1 imperial gallon equals 0.1605436532 cubic feet. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubic foot?
Cubic foot (ft3) measures volume. A cubic foot is exactly 0.028316846592 cubic meters, derived from the 1959 international foot. It is classified as a US/imperial customary unit.
What is a imperial gallon?
Imperial gallon (imp gal) measures volume. The imperial gallon is defined as exactly 4.54609 liters, about 20% larger than the US gallon. It is classified as a UK/imperial customary unit.
Is the cubic foot to imperial gallon conversion exact?
Yes. The imperial gallon is defined as exactly 4.54609 liters, about 20% larger than the US gallon. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between imperial gallon vs. us gallon?
Britain's 1824 Weights and Measures Act defined a new gallon based on 10 pounds of water, replacing the old wine gallon the US had already adopted — leaving the US (3.785 L) and imperial (4.546 L) gallons about 20% apart today.
Where is the cubic foot still used today?
United States (construction, HVAC, natural gas billing)