Gallon to Gallon Converter
Enter the value that you want to convert gallon (gal) to gallon (gal) or gallon to gallon.Also written as GAL to GAL conversion.
1 gallon = 0.8326742 gallon
Formula: gallon = gallon value × 0.8326742
GAL to GAL — gallon to gallon
10 gallon = 8.32674 gallon
Popular Volume Converters:
Converting Gallon to Gallon
The Gallon Explained
Gallon (gal) is a unit of volume measurement. 1 gallon is equal to 0.8326742 gallon.
The Gallon Explained
Gallon (gal) is a unit of volume measurement. 1 gallon is equal to 1.2009499 gallon.
Volume Measurement Systems
Volume units are particularly confusing because the US and UK gallons differ (US gallon = 3.785 L, UK gallon = 4.546 L), as do their pints, cups, and fluid ounces. Cooking, fuel economy, beverage production, and pharmaceutical compounding all require precise volume conversions. Laboratory work uses milliliters and liters while US recipes specify cups, tablespoons, and fluid ounces.
gallon to gallon metric conversion table
| 0.01 gal | = | 0.00833 gal |
| 0.1 gal | = | 0.08327 gal |
| 1 gal | = | 0.83267 gal |
| 2 gal | = | 1.66535 gal |
| 3 gal | = | 2.49802 gal |
| 4 gal | = | 3.33070 gal |
| 5 gal | = | 4.16337 gal |
| 6 gal | = | 4.99605 gal |
| 7 gal | = | 5.82872 gal |
| 8 gal | = | 6.66139 gal |
| 9 gal | = | 7.49407 gal |
| 10 gal | = | 8.32674 gal |
| 11 gal | = | 9.15942 gal |
| 12 gal | = | 9.99209 gal |
| 13 gal | = | 10.82476 gal |
| 14 gal | = | 11.65744 gal |
| 15 gal | = | 12.49011 gal |
| 16 gal | = | 13.32279 gal |
| 17 gal | = | 14.15546 gal |
| 18 gal | = | 14.98814 gal |
| 19 gal | = | 15.82081 gal |
| 20 gal | = | 16.65348 gal |
| 30 gal | = | 24.98023 gal |
| 40 gal | = | 33.30697 gal |
| 50 gal | = | 41.63371 gal |
| 60 gal | = | 49.96045 gal |
| 70 gal | = | 58.28719 gal |
| 80 gal | = | 66.61393 gal |
| 90 gal | = | 74.94068 gal |
| 100 gal | = | 83.26742 gal |
| 200 gal | = | 166.53484 gal |
| 300 gal | = | 249.80226 gal |
| 400 gal | = | 333.06967 gal |
| 500 gal | = | 416.33709 gal |
| 600 gal | = | 499.60451 gal |
| 700 gal | = | 582.87193 gal |
| 800 gal | = | 666.13935 gal |
| 900 gal | = | 749.40677 gal |
| 1000 gal | = | 832.67418 gal |
How to Convert GAL to GAL (Gallon to Gallon)?
We can convert gallon to gallon by using an example.
Example:
Convert 20 Gallon to Gallon?
We know 1 Gallon = 0.8326742 gallon; 1 Gallon = 1.2009499 gallon.
20 gallon = ___gal
20 × 0.8326742 = 16.65348 gal (we know 1 gallon = 0.8326742 gallon)
Answer:
20 gallon = 16.65348 gallon
How to Convert US Gallons to UK (Imperial) Gallons (Step-by-Step)
The US gallon and UK imperial gallon are different units despite sharing the name "gallon." One US gallon equals 0.832674 UK gallons — the US gallon is about 17% smaller. This conversion prevents costly errors in fuel calculations, shipping, and international trade.
- Write down the volume in US gallons.
- Multiply by 0.832674 to get UK (imperial) gallons.
- Or divide by 1.20095 (since 1 UK gallon = 1.201 US gallons).
- The result is the equivalent in imperial gallons.
US Gallons to UK Gallons Conversion
Side-by-side comparison showing how US gallon volumes translate to UK imperial gallons:
| Gallon | Gallon |
|---|---|
| 1 US gal | 0.833 UK gal |
| 5 US gal | 4.163 UK gal |
| 10 US gal | 8.327 UK gal |
| 15 US gal | 12.490 UK gal |
| 20 US gal | 16.653 UK gal |
| 42 US gal | 34.972 UK gal |
| 55 US gal | 45.797 UK gal |
| 100 US gal | 83.267 UK gal |
Solved Examples: US Gallons to UK Gallons
Question 1: A US car ad says 22 MPG (US). What would this be in UK MPG?
Solution:
UK MPG = US MPG × 1.20095 (inverse of 0.832674)
= 22 × 1.20095
= 26.4 MPG (imperial)
Answer: 22 US MPG = 26.4 UK MPG (same fuel usage, different gallon sizes).
Question 2: Convert 35 US gallons of fuel to UK gallons.
Solution:
UK gallons = US gallons × 0.832674
= 35 × 0.832674
= 29.14 UK gallons
Answer: 35 US gallons = 29.14 imperial gallons.
Question 3: A US recipe makes 2 gallons of chili. How many UK gallons?
Solution:
UK gallons = 2 × 0.832674
= 1.665 UK gallons
Answer: 2 US gallons = 1.67 UK gallons.
Practice Questions
Try solving these on your own to test your understanding:
- Convert 50 US gallons to UK gallons. (Answer: 41.63 UK gal)
- A US truck has a 30-gallon tank. Express in UK gallons. (Answer: 24.98 UK gal)
- Convert 1 barrel (42 US gal) to UK gallons. (Answer: 34.97 UK gal)
- How many UK gallons is 8 US gallons? (Answer: 6.66 UK gal)
- If fuel is $4/US gallon, what is that per UK gallon? (Answer: $4.80/UK gal)
Why MPG Numbers Differ Between US and UK
A car review in a US magazine might say "30 MPG" while a UK review of the same car says "36 MPG." They are reporting identical fuel efficiency — the difference is purely that the UK gallon is 20% larger. To convert: US MPG × 1.201 = UK MPG. This regularly confuses buyers comparing vehicles across markets. Always check whether fuel economy figures use US or imperial gallons before comparing.
Historical Divergence: How One Word Became Two Units
Both the US and UK gallons descend from English measurement traditions, but diverged in 1824. The US retained the 1707 Queen Anne wine gallon (231 cubic inches = 3.785 L), used for trade since colonial times. Britain redefined the gallon in 1824 as 10 pounds of water (277.42 cubic inches = 4.546 L), aligning it with the old ale gallon. This created permanent confusion in English-speaking trade.
Practical Impact: Shipping and International Trade
In international shipping, specifying "US gallons" or "imperial gallons" is critical. A shipment invoiced as "1,000 gallons" without specification creates a 20% ambiguity — that is 3,785 L (US) or 4,546 L (UK). The petroleum industry avoids this by using barrels (42 US gallons) internationally. The chemical industry uses liters exclusively for international orders to eliminate gallon confusion entirely.
Key Takeaways
- Multiply US gallons by 0.832674 to get UK gallons.
- The US gallon (3.785 L) is about 17% smaller than the UK gallon (4.546 L).
- 1 UK gallon = 1.201 US gallons.
- US MPG × 1.201 = UK MPG (same efficiency, different unit size).
- Always specify "US" or "imperial/UK" when communicating gallon values internationally.
- The petroleum industry uses barrels (42 US gal) to avoid gallon confusion.
Gallon to Gallon Conversion Formula
gallon = gallon × 0.8326742
1 gallon = 0.8326742 gallon
1 gallon = 1.2009499 gallon
Reverse: gallon = gallon × 1.2009499
Frequently Asked Questions
How many gallon are in 1 gallon?
There are 0.8326742 gallon in 1 gallon. To convert gallon to gallon, multiply the value by 0.8326742.
How do I convert gallon to gallon?
Multiply your gallon value by 0.8326742 to get the equivalent in gallon. For example, 5 gallon = 5 × 0.8326742 = 4.16337 gallon.
How do I convert gallon to gallon?
Multiply your gallon value by 1.2009499 to get the equivalent in gallon. Alternatively, divide by 0.8326742.
What is 10 gallon in gallon?
10 gallon is equal to 8.32674 gallon.
What is 100 gallon in gallon?
100 gallon is equal to 83.26742 gallon.