Understanding US Dry Gallons to Imperial Gallons Conversion
The US dry gallon is a US customary unit of volume used for measuring dry commodities such as grain, berries, and produce, equal to about 4.40488 litres. The imperial gallon is the British unit of volume, defined as exactly 4.54609 litres and still used in the UK for fuel economy and liquid trade. This conversion is handy when comparing agricultural dry-goods quantities across US and UK measuring systems.
Conversion Formula
To convert US Dry Gallons to Imperial Gallons, multiply by this factor:
Step-by-Step Example
Convert 25 US Dry Gallons to Imperial Gallons.
How to Convert US Dry Gallons to Imperial Gallons
Converting between these two gallon standards takes a single multiplication once you know the ratio.
- Identify the value: Start with your quantity in US dry gallons, for example 25 gal-dry.
- Apply the factor: Multiply by 0.968939, the number of imperial gallons in one US dry gallon.
- Compute the product: .
- State the result: 25 US dry gallons equal about 24.2235 imperial gallons.
US Dry Gallons to Imperial Gallons conversion table
| US Dry Gallons (gal-dry) | Imperial Gallons (imp-gal) |
|---|---|
| 0 | 0 |
| 1 | 0.968939 |
| 2 | 1.937878 |
| 3 | 2.906817 |
| 4 | 3.875756 |
| 5 | 4.844695 |
| 6 | 5.813634 |
| 7 | 6.782573 |
| 8 | 7.751512 |
| 9 | 8.720451 |
| 10 | 9.68939 |
| 15 | 14.53408 |
| 20 | 19.37878 |
| 25 | 24.22347 |
| 30 | 29.06817 |
| 40 | 38.75756 |
| 50 | 48.44695 |
| 60 | 58.13634 |
| 70 | 67.82573 |
| 80 | 77.51512 |
| 90 | 87.20451 |
| 100 | 96.8939 |
| 150 | 145.3408 |
| 200 | 193.7878 |
| 250 | 242.2347 |
| 300 | 290.6817 |
| 400 | 387.5756 |
| 500 | 484.4695 |
| 600 | 581.3634 |
| 700 | 678.2573 |
| 800 | 775.1512 |
| 900 | 872.0451 |
| 1000 | 968.939 |
| 2000 | 1937.878 |
| 3000 | 2906.817 |
| 4000 | 3875.756 |
| 5000 | 4844.695 |
| 10000 | 9689.39 |
| 25000 | 24223.47 |
| 50000 | 48446.95 |
| 100000 | 96893.9 |
| 250000 | 242234.7 |
| 500000 | 484469.5 |
| 1000000 | 968939 |
Which gallon do you mean?
“gallon” means different units by region. This page uses the Imperial gallon (UK). 1 US Dry Gallons in each:
| Definition | Result |
|---|---|
| US gallon 3.785 L | 1.163647 gal |
| Imperial gallon (UK) 4.546 L | 0.968939 imp-gal (this page) |
What is the US Dry Gallon?
The US dry gallon (gal-dry) is a unit of volume used in the United States for measuring dry commodities such as grains, berries, and other agricultural produce. It is larger than the more familiar US liquid gallon.
Definition
The US dry gallon is defined as one-eighth of a US bushel, which equals 268.8025 cubic inches:
Exactly, 1 US dry gallon = 4.40488377086 liters. This is about 16.4% larger than the US liquid gallon (3.785411784 L) but slightly smaller than the imperial gallon (4.54609 L).
Origin and History
The dry gallon derives from the Winchester bushel, an English measure standardized in the late 17th century and defined as a cylinder 18.5 inches in diameter and 8 inches deep. The United States retained this bushel after independence, and the dry gallon is simply one-eighth of it. Dry measures existed because heaped commodities settle and compact differently than liquids, so a separate volume standard was practical for trade.
Law and Notable Facts
The US dry gallon is a legal US customary unit but is rarely used directly; dry commodities are more often traded in quarts, pecks, or bushels. It is not an SI unit. The UK abolished separate dry measures in 1824 when it adopted the imperial system, so the dry gallon is specifically an American measure.
Real-World Examples and Conversions
- 1 US dry gallon = 4.40488 L ≈ 268.8 cubic inches.
- 8 US dry gallons make 1 US bushel; 2 dry gallons make 1 peck.
- A US dry gallon holds about 4.6546 US dry quarts.
- 1 US dry gallon is roughly 1.164 US liquid gallons.
What is the Imperial Gallon?
The imperial gallon is a unit of volume used in the United Kingdom and several Commonwealth countries, most commonly for measuring fuel, beverages, and other liquids. It is noticeably larger than the US gallon.
Definition
The imperial gallon is defined as exactly 4.54609 litres:
This is an exact defining relation, not an approximation. The imperial gallon is also subdivided into 4 quarts, 8 pints, or 160 imperial fluid ounces, and it is about 20% larger than the US liquid gallon (3.78541 L).
Origin and History
The gallon descends from medieval English measures for wine and ale, which historically had several conflicting definitions. The imperial gallon was standardised by the British Weights and Measures Act of 1824, originally defined as the volume of 10 pounds of distilled water weighed in air at 62 °F. In 1985 the UK redefined it in exact metric terms as 4.54609 litres, aligning the traditional unit with the SI system.
Law and Notable Facts
The imperial gallon remains a legally recognised unit in the UK and countries such as Canada, though metric litres are now standard for most trade. A key point of confusion is that the imperial gallon (4.54609 L) differs from the US liquid gallon (3.785411784 L); the two share a name but are distinct units, so fuel-economy figures quoted in "miles per gallon" are not directly comparable between the UK and the US.
Real-World Examples and Conversions
- A UK fuel purchase of 10 imperial gallons is about 45.46 litres.
- A car rated at 50 miles per imperial gallon achieves roughly 41.6 miles per US gallon for the same efficiency.
- 1 imperial gallon of fresh water weighs about 4.546 kg (roughly 10 pounds), reflecting its original 1824 definition.
- 1 imperial gallon equals about 1.20095 US gallons.
Frequently Asked Questions
How many Imperial Gallons are in one US Dry Gallon?
One US dry gallon equals about 0.968939 imperial gallons, because the dry gallon (~4.40488 L) is slightly smaller than the imperial gallon (4.54609 L).
Why is a US dry gallon smaller than an imperial gallon?
The US dry gallon derives from the historic Winchester bushel used for grain, while the imperial gallon was standardised in 1824 as 10 pounds of water, giving it a larger volume.
How do I convert Imperial Gallons back to US Dry Gallons?
Multiply the imperial gallon figure by 1.032057. For example, 10 imperial gallons equal about 10.32 US dry gallons.
Where is this conversion used?
It appears when comparing dry-goods measures such as fruit, grain, or seed quantities quoted in US dry gallons against UK imperial figures.
What is 5 US Dry Gallons in Imperial Gallons?
Multiply 5 by 0.968939 to get about 4.84470 imperial gallons.