An imperial gallon is exactly 4.54609 liters.
Imperial gallons to Cubic feet Converter — imp gal to ft3
Convert Imperial gallon (imp gal) to Cubic foot (ft3) using the exact conversion factor (1 imperial gallon = 0.1605436532 cubic foot). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Imperial gallons to Cubic feet 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.
A cubic foot is exactly 0.028316846592 cubic meters.
Result = input x 0.00454609 / 0.02831684659.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial gallons to Cubic feet
Imperial gallon and Cubic foot 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. Imperial gallon is typically associated with united Kingdom, Canada (some contexts), and other Commonwealth countries, while Cubic foot is typically associated with united States (construction, HVAC, natural gas billing).
Formula
cubic feet = imperial gallons × 0.160543653236
This factor comes from each unit's defined relationship to the category's base unit: 1 imperial gallon equals 0.00454609 base units, and 1 cubic foot equals 0.028316846592 base units, so dividing one by the other gives the direct imperial gallon-to-cubic foot factor of 0.160543653236.
Simple example
1 imp gal × 0.1605436532 = 0.1605436532 ft3
1 imperial gallon = 0.1605436532 cubic feet.
Real-world example
10 imp gal × 0.1605436532 = 1.605436532 ft3
10 imperial gallons = 1.605436532 cubic feet.
Conversion table
| Imperial gallon (imp gal) | Cubic foot (ft3) |
|---|---|
| 1 imp gal | 0.1605436532 ft3 |
| 5 imp gal | 0.8027182662 ft3 |
| 10 imp gal | 1.605436532 ft3 |
| 25 imp gal | 4.013591331 ft3 |
| 50 imp gal | 8.027182662 ft3 |
| 100 imp gal | 16.05436532 ft3 |
Reverse conversion: Cubic foot to Imperial gallon
0.1605436532 ft3 × 6.228835459 = 0.9999999998 imp gal
0.1605436532 cubic feet = 0.9999999998 imperial gallons.
imperial gallons = cubic feet × 6.22883545904
For a page dedicated to this direction, see Cubic foot to Imperial gallon.
Imperial gallon vs. Cubic foot
| Aspect | Imperial gallon | Cubic foot |
|---|---|---|
| Family | UK/imperial customary unit | US/imperial customary unit |
| Typical use | UK fuel and beverage measurement (historically; UK now primarily uses liters for retail) | US natural gas utility billing (often in hundreds or thousands of cubic feet) |
| Where it's used | United Kingdom, Canada (some contexts), and other Commonwealth countries | United States (construction, HVAC, natural gas billing) |
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.
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.
Imperial gallon — sources
- UK Weights and Measures Act 1824 — Establishes the imperial gallon definition.
Cubic foot — sources
- NIST — International yard and pound (1959) — Basis for the modern foot and its derived volume unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubic feet are in 1 imperial gallon?
1 imperial gallon equals 0.1605436532 cubic feet, using the exact defined conversion factor rather than an estimate.
How do I convert imperial gallon to cubic foot?
Multiply the imperial gallon value by 0.1605436532. The converter above does this instantly to whatever precision you set.
How do I convert cubic foot back to imperial gallon?
Use the reverse factor: 1 cubic foot equals 6.228835459 imperial gallons. You can also use the swap control in the converter above to flip the direction instantly.
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.
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.
Is the imperial gallon to cubic foot conversion exact?
Yes. A cubic foot is exactly 0.028316846592 cubic meters, derived from the 1959 international foot. 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 imperial gallon still used today?
United Kingdom, Canada (some contexts), and other Commonwealth countries