Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Imperial Gallons to Liters Converter (UK gal to L)
liters = imperial gallons × 4.54609. Exact since the 1985 Weights and Measures definition.
The UK (imperial) gallon is exactly 4.54609 L. The US liquid gallon is 3.785411784 L. A British 8-gallon beer firkin and a US 5-gallon bucket are not cousins. If the pump is in Canada or the UK, this is the gallon.
Imperial gallons
imp gal → L
4.54609 L
1 imp gal = 4.54609 L. 5 imp gal ≈ 22.730 L. An 8 gal firkin ≈ 36.369 L.
- You typed
- 1 imp gal
- One L is
- 0.219969 imp gal
- How it’s calculated
- liters = imperial gallons × 4.54609. Exact since the 1985 Weights and Measures definition.
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Imperial gallons
The “Imperial gallons” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
The UK (imperial) gallon is exactly 4.54609 L. The US liquid gallon is 3.785411784 L. A British 8-gallon beer firkin and a US 5-gallon bucket are not cousins. If the pump is in Canada or the UK, this is the gallon. liters = imperial gallons × 4.54609. Exact since the 1985 Weights and Measures definition. Example: 1 imp gal = 4.54609 L. 5 imp gal ≈ 22.730 L. An 8 gal firkin ≈ 36.369 L.
liters = imperial gallons × 4.54609. Exact since the 1985 Weights and Measures definition.
Example: 1 imp gal = 4.54609 L. 5 imp gal ≈ 22.730 L. An 8 gal firkin ≈ 36.369 L.
When to use this Imperial Gallons to Liters
Common use cases
- The UK (imperial) gallon is exactly 4.54609 L. The US liquid gallon is 3.785411784 L. A British 8-gallon beer firkin and a US 5-gallon bucket are not cousins. If the pump is in Canada or the UK, this is the gallon.
- Sanity-check with this case: 1 imp gal = 4.54609 L. 5 imp gal ≈ 22.730 L. An 8 gal firkin ≈ 36.369 L.
- The relationship is: liters = imperial gallons × 4.54609. Exact since the 1985 Weights and Measures definition.
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Imperial gallons
- liters = imperial gallons × 4.54609. Exact since the 1985 Weights and Measures definition.
- Example on the page: 1 imp gal = 4.54609 L. 5 imp gal ≈ 22.730 L. An 8 gal firkin ≈ 36.369 L.
How to Convert Imperial Gallons to Liters Step-by-Step
- 1Enter Imperial gallons. Use the values you have, not a catalog average, unless that is all you know.
- 2liters = imperial gallons × 4.54609. Exact since the 1985 Weights and Measures definition.
- 3Worked case: 1 imp gal = 4.54609 L. 5 imp gal ≈ 22.730 L. An 8 gal firkin ≈ 36.369 L.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
liters = imperial gallons × 4.54609. Exact since the 1985 Weights and Measures definition.
1 imp gal = 4.54609 L. 5 imp gal ≈ 22.730 L. An 8 gal firkin ≈ 36.369 L.
Example: set Imperial gallons = 1, then read the result.
Variable definitions
- value
Imperial gallons
The “Imperial gallons” field. Default 1; typical range 0–1000000000.
- The conversion (liters = imperial gallons × 4.54609. Exact since the 1985 Weights and Measures definition.) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Use gallons to liters. That page is US liquid 3.785411784 L.
Related calculators
Unit Converters
- Gallons to LitersFill-up math when the pump is in gallons and the car computer is in liters. Multiply US gallons by 3.785. A 15 gal fill is 56.8 L. UK gallons would overstate that by about 20%.
- GPM to L/min1 US gpm = 3.785 L/min. A 2.5 gpm showerhead is 9.5 L/min. UK gallons are larger. Fixture laws care about the number on the aerator, not the pipe diameter.
- Liters to GallonsCar tanks, paint, and aquariums. This is the US liquid gallon (3.785 L), not the UK gallon (4.546 L). Divide liters by 3.785. A 50 L tank is 13.2 US gal. Using the UK gallon will short you fuel.
- MPG to L/100kmL/100km = 235.215 / US mpg. Higher mpg is better; higher L/100km is worse. UK mpg uses the imperial gallon, so the constant is 282.5 — use the sibling page’s note if the brochure is British.
- Quarts to GallonsFour US quarts make a gallon. Stock pots and paint cans still speak this language. An imperial gallon is 4.55 L, not 3.79 L — do not mix them in a brine.
- BMI Metric and ImperialBMI = kg / m² = 703 × lb / in². Same index, two unit systems. It does not know muscle, bone, or why a powerlifter and a couch get the same number. Categories are public-health bins, not a diagnosis.
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Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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