Convert Imperial Gallon to Litre
1 imperial gallon = 4.54609 litre (L). For example, 10 imperial gallon = 45.4609 litre and 100 imperial gallon = 454.609 litre. Type any value below to convert imperial gallon to litre both ways — it runs entirely in your browser.
Quick answer: Imperial Gallon to Litre
1 Imperial Gallon = 4.54609 Litre (imp gal → L). To convert imperial gallon to litre, multiply by 4.54609. To convert litre to imperial gallon, multiply by 0.2199692. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common imperial gallon-to-litre questions.
How to convert Imperial Gallon to Litre
To convert imperial gallon to litre, multiply the number of imperial gallon by the conversion factor 4.54609, because 1 imp gal = 4.54609 L. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 L = 0.2199692 imp gal, so you divide by 4.54609 (or multiply by 0.2199692) to turn litre back into imperial gallon.
L = imp gal × 4.54609 ·
imp gal = L × 0.2199692
- Write down the value you want to convert, in imperial gallon.
- Multiply it by 4.54609.
- The result is the same area/length/quantity expressed in litre.
Imperial Gallon to Litre — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 imperial gallon is 22.73045 litre because 5 imp gal × 4.54609 = 22.73045 L.
| Imperial Gallon | Calculation | Litre |
|---|---|---|
| 1 imp gal | 1 imp gal × 4.54609 = 4.54609 L | 4.54609 L |
| 2 imp gal | 2 imp gal × 4.54609 = 9.09218 L | 9.09218 L |
| 3 imp gal | 3 imp gal × 4.54609 = 13.63827 L | 13.63827 L |
| 5 imp gal | 5 imp gal × 4.54609 = 22.73045 L | 22.73045 L |
| 7 imp gal | 7 imp gal × 4.54609 = 31.82263 L | 31.82263 L |
| 10 imp gal | 10 imp gal × 4.54609 = 45.4609 L | 45.4609 L |
| 12 imp gal | 12 imp gal × 4.54609 = 54.55308 L | 54.55308 L |
| 15 imp gal | 15 imp gal × 4.54609 = 68.19135 L | 68.19135 L |
| 20 imp gal | 20 imp gal × 4.54609 = 90.9218 L | 90.9218 L |
| 25 imp gal | 25 imp gal × 4.54609 = 113.6523 L | 113.6523 L |
| 50 imp gal | 50 imp gal × 4.54609 = 227.3045 L | 227.3045 L |
| 100 imp gal | 100 imp gal × 4.54609 = 454.609 L | 454.609 L |
Common Imperial Gallon to Litre conversions
These are the imperial gallon-to-litre values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 imperial gallon = 4.54609 litre
- 2 imperial gallon = 9.09218 litre
- 2.5 imperial gallon = 11.36523 litre
- 3 imperial gallon = 13.63827 litre
- 4 imperial gallon = 18.18436 litre
- 5 imperial gallon = 22.73045 litre
- 6 imperial gallon = 27.27654 litre
- 7 imperial gallon = 31.82263 litre
- 8 imperial gallon = 36.36872 litre
- 9 imperial gallon = 40.91481 litre
- 10 imperial gallon = 45.4609 litre
- 12 imperial gallon = 54.55308 litre
- 15 imperial gallon = 68.19135 litre
- 20 imperial gallon = 90.9218 litre
- 25 imperial gallon = 113.6523 litre
- 30 imperial gallon = 136.3827 litre
- 50 imperial gallon = 227.3045 litre
- 75 imperial gallon = 340.9568 litre
- 100 imperial gallon = 454.609 litre
- 200 imperial gallon = 909.218 litre
- 500 imperial gallon = 2,273.045 litre
- 1000 imperial gallon = 4,546.09 litre
Imperial Gallon to Litre conversion chart (both directions)
The chart below converts imperial gallon to litre and litre to imperial gallon side by side, so it works whichever way you need. 1 imperial gallon = 4.54609 litre, and 1 litre = 0.2199692 imperial gallon.
| Imperial Gallon → Litre | Litre → Imperial Gallon |
|---|---|
| 0.25 imp gal = 1.136523 L | 0.25 L = 0.05499231 imp gal |
| 0.5 imp gal = 2.273045 L | 0.5 L = 0.1099846 imp gal |
| 1 imp gal = 4.54609 L | 1 L = 0.2199692 imp gal |
| 2 imp gal = 9.09218 L | 2 L = 0.4399385 imp gal |
| 3 imp gal = 13.63827 L | 3 L = 0.6599077 imp gal |
| 4 imp gal = 18.18436 L | 4 L = 0.879877 imp gal |
| 5 imp gal = 22.73045 L | 5 L = 1.099846 imp gal |
| 6 imp gal = 27.27654 L | 6 L = 1.319815 imp gal |
| 7 imp gal = 31.82263 L | 7 L = 1.539785 imp gal |
| 8 imp gal = 36.36872 L | 8 L = 1.759754 imp gal |
| 9 imp gal = 40.91481 L | 9 L = 1.979723 imp gal |
| 10 imp gal = 45.4609 L | 10 L = 2.199692 imp gal |
| 12 imp gal = 54.55308 L | 12 L = 2.639631 imp gal |
| 15 imp gal = 68.19135 L | 15 L = 3.299539 imp gal |
| 20 imp gal = 90.9218 L | 20 L = 4.399385 imp gal |
| 25 imp gal = 113.6523 L | 25 L = 5.499231 imp gal |
| 30 imp gal = 136.3827 L | 30 L = 6.599077 imp gal |
| 40 imp gal = 181.8436 L | 40 L = 8.79877 imp gal |
| 50 imp gal = 227.3045 L | 50 L = 10.99846 imp gal |
| 75 imp gal = 340.9568 L | 75 L = 16.49769 imp gal |
| 100 imp gal = 454.609 L | 100 L = 21.99692 imp gal |
| 150 imp gal = 681.9135 L | 150 L = 32.99539 imp gal |
| 200 imp gal = 909.218 L | 200 L = 43.99385 imp gal |
| 250 imp gal = 1,136.523 L | 250 L = 54.99231 imp gal |
| 500 imp gal = 2,273.045 L | 500 L = 109.9846 imp gal |
| 1000 imp gal = 4,546.09 L | 1000 L = 219.9692 imp gal |
Imperial Gallon vs Litre: which is bigger?
A imperial gallon is the larger unit: one imperial gallon equals 4.54609 litres. Put another way, you need 4.54609 litres to make a single imperial gallon.
What is a Imperial Gallon? History, origin and usage
An imperial (UK) gallon is exactly 4.54609 litres — 8 imperial pints, and about 20% larger than the US gallon.
What is a Litre? History, origin and usage
The litre was introduced in France in 1795 as a republican measure equal to one cubic decimetre, its name derived from the older French litron, in turn from Byzantine Greek (where it had been a unit of weight) via Late Medieval Latin. In 1901 the litre was redefined as the volume of one kilogram of pure water at maximum density, making it very slightly larger than a cubic decimetre. In 1964 that awkward definition was abandoned and the litre returned to being exactly one cubic decimetre.
The litre is the everyday metric unit of volume across most of the world: fuel sold at the pump, bottled water and soft drinks, milk, engine and cooking oil, and car engine capacity. It is the unit people reach for whenever a volume is larger than a kitchen spoonful but smaller than a tankful.
The litre is not an official SI unit but is accepted for use alongside it. Its symbol may be written as a capital L precisely because a lowercase l is easily mistaken for the digit 1 in many fonts.
Convert 1 Imperial Gallon to other units
It can help to see a imperial gallon next to the other units it is commonly compared with. One imperial gallon (imp gal) is equal to:
| 1 Imperial Gallon equals | Unit |
|---|---|
| 4,546.09 mL | Millilitre |
| 454.609 cL | Centilitre |
| 4.54609 L | Litre |
| 0.00454609 m³ | Cubic Metre |
| 4,546.09 cm³ | Cubic Centimetre |
| 277.4194 in³ | Cubic Inch |
| 0.1605437 ft³ | Cubic Foot |
| 1.20095 US gal | US Gallon |
| 1.20095 gal | US Gallon |
| 4.8038 US qt | US Quart |
| 4.8038 qt | US Quart |
| 9.607599 US pt | US Pint |
| 9.607599 pt | US Pint |
| 153.7216 US fl oz | US Fluid Ounce |
| 153.7216 fl oz | US Fluid Ounce |
| 160 imp fl oz | Imperial Fluid Ounce |
| 8 imp pt | Imperial Pint |
| 307.4432 tbsp | US Tablespoon |
| 922.3295 tsp | US Teaspoon |
| 38.4304 gi | US Gill |
| 0.1290071 bu | US Bushel |
| 0.02859405 bbl | Oil Barrel |
| 4,546,090 µL | Microlitre |
| 19.2152 US cup | US Cup |
| 153.7216 US fl oz | US Fluid Ounce |
Convert 1 Litre to other units
One litre (L) is equal to:
| 1 Litre equals | Unit |
|---|---|
| 1,000 mL | Millilitre |
| 100 cL | Centilitre |
| 0.001 m³ | Cubic Metre |
| 1,000 cm³ | Cubic Centimetre |
| 61.02374 in³ | Cubic Inch |
| 0.03531467 ft³ | Cubic Foot |
| 0.2641721 US gal | US Gallon |
| 0.2641721 gal | US Gallon |
| 1.056688 US qt | US Quart |
| 1.056688 qt | US Quart |
| 2.113376 US pt | US Pint |
| 2.113376 pt | US Pint |
| 33.81402 US fl oz | US Fluid Ounce |
| 33.81402 fl oz | US Fluid Ounce |
| 35.19508 imp fl oz | Imperial Fluid Ounce |
| 1.759754 imp pt | Imperial Pint |
| 0.2199692 imp gal | Imperial Gallon |
| 67.62805 tbsp | US Tablespoon |
| 202.8841 tsp | US Teaspoon |
| 8.453506 gi | US Gill |
| 0.02837759 bu | US Bushel |
| 0.006289811 bbl | Oil Barrel |
| 1,000,000 µL | Microlitre |
| 4.226753 US cup | US Cup |
| 33.81402 US fl oz | US Fluid Ounce |
Tips for converting Imperial Gallon to Litre
- To go from imperial gallon to litre, multiply by 4.54609; to go back, divide by 4.54609 (or multiply by 0.2199692).
- For a quick mental estimate, remember that 1 imperial gallon ≈ 4.54609 litre, so 10 imperial gallon ≈ 45.4609 litre.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type — change either side to convert in that direction.
How to use this Imperial Gallon to Litre converter
Type a number into the Imperial Gallon field and the equivalent in Litre appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Litre field to convert the other way (litre to imperial gallon). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 imp gal = 4.54609 L), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for imperial gallon-to-litre conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- BIPM — The International System of Units (SI Brochure) — the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
- NIST — Definitions of the SI base units — the US National Institute of Standards and Technology reference for the SI base units, used here as an independent cross-check on the base-unit definition.
Watch the system: a <strong>US</strong> gallon, quart, pint and fluid ounce are <strong>not</strong> the same size as the <strong>imperial (UK)</strong> ones — a US gallon is 3.785 L while an imperial gallon is 4.546 L, and a US fluid ounce (29.57 mL) is slightly larger than an imperial fluid ounce (28.41 mL). The units on this page are labelled US or Imperial so the result is unambiguous.
Frequently asked questions
- How many litre are in 1 imperial gallon?
- 1 imperial gallon = 4.54609 litre (L). To convert any number of imperial gallon to litre, multiply by 4.54609.
- How do I convert imperial gallon to litre?
- Multiply the number of imperial gallon by 4.54609. For example, 10 imperial gallon = 10 × 4.54609 = 45.4609 litre, and 25 imperial gallon = 113.6523 litre.
- How many imperial gallon are in 1 litre?
- 1 litre = 0.2199692 imperial gallon. So to convert litre back to imperial gallon, multiply by 0.2199692.
- What is the formula to convert imperial gallon to litre?
- litre = imperial gallon × 4.54609. The reverse formula is imperial gallon = litre × 0.2199692.
- How much is 100 imperial gallon in litre?
- 100 imperial gallon = 454.609 litre. (And 1000 imperial gallon = 4,546.09 litre.)
- Which is bigger, a imperial gallon or a litre?
- A imperial gallon is larger: 1 imperial gallon = 4.54609 litre.
- Is this imperial gallon to litre converter accurate?
- Yes — every value is computed from the exact 4.54609 L per imp gal factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert litre to imperial gallon too?
- Yes. The converter works both ways — enter a value in either field. 1 litre = 0.2199692 imperial gallon.