Imperial gallon to US liquid gallon
Convert Imperial gallon (Imp gal) to US liquid gallon (US gal). Use an editable volume converter, conversion formula, and reference table.
1 Imp gal = 1.200949926 US gal
Conversion formula
One Imperial gallon equals 1.200949926 US liquid gallon. Multiply your value in Imperial gallon by this factor to get US liquid gallon. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 Imperial gallon:5 × 1.200949926 = 6.004749628 US gal
Conversion table
| Imperial gallon (Imp gal) | US liquid gallon (US gal) |
|---|---|
| 0.01 | 0.01200949926 |
| 0.1 | 0.1200949926 |
| 1 | 1.200949926 |
| 2 | 2.401899851 |
| 5 | 6.004749628 |
| 10 | 12.00949926 |
| 25 | 30.02374814 |
| 50 | 60.04749628 |
| 100 | 120.0949926 |
| 1000 | 1,200.949926 |
About these measurements
Volume describes three-dimensional space or liquid capacity.
The base reference used here is the liter. One Imperial gallon is 4.54609 base units; one US liquid gallon is 3.785411784 base units.
Important distinctions
US liquid measures and Imperial measures are different. Dry gallons and recipe cups are excluded.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert Imp gal to US gal?
Multiply the quantity in Imp gal by 1.200949926. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the US liquid gallon to Imperial gallon converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
