Marine & NauticalImperial Gallons to Liters

Imperial Gallons to Liters

Snapshot

1 Imperial Gallon equals 4.54609 Liters. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

Reference basis: This result uses fixed marine-capacity definitions for tanks, holds, and onboard volume checks.
Example: For 2 Imperial Gallons, the result equals 9.09218 Liters.
Use the reverse page if you need the opposite direction with the same basis.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

4.54609 Liters (L)

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Machine access

Available to apps and AI agents

Imperial Gallons to Liters can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The identifiers below select the same calculation as the calculator.

Machine-readable identifiers

Conversion family: marine
Source unit: imperial_gallons
Target unit: liters

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "marine",
  "value": 1,
  "from": "imperial_gallons",
  "to": "liters"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "marine",
    "value": 1,
    "from": "imperial_gallons",
    "to": "liters",
    "result": {
      "raw": 4.54609,
      "display": "4.54609"
    },
    "canonicalPath": "/marine/imperial-gallons-to-liters/"
  }
}

Full API documentation

Explanation

One Imperial gallon equals exactly 4.54609 liters. Liter and litre are two spellings for the same metric unit, so the result is unchanged whether a capacity is written in liters or litres. The same fixed factor gives 2 Imperial gallons as 9.09218 liters and 5 Imperial gallons as 22.73045 liters.

Identifying the gallon as Imperial matters: this converter uses the fixed Imperial-gallon definition, which is different from the separately defined US gallon. Use it for tank, hold, fuel, and onboard-capacity values when the source specifically says Imperial gallon; the reverse page uses the same measurement definition.

Method & Marine Basis

Method basis: fixed marine-capacity definitions used for tank, hold, and fueling calculations.
Applied factor: 1 Imperial Gallon = 4.54609 Liters.
Consistency rule: calculator output and common-value rows use the same fixed marine constants in both directions.

Common Conversion Values

Imperial Gallon (Imp gal)	Liters (L)
1	4.54609
2	9.09218
5	22.73045
10	45.4609
20	90.9218
50	227.3045
100	454.609

Questions & answers

Frequently Asked Questions

How many liters are in 1 imperial gallon?

1 Imperial gallon equals exactly 4.54609 liters.

What is the reverse conversion for Imperial Gallons to Liters?

Use the Liters to Imperial Gallons page to reverse the same fixed Imperial-gallon measurement definition.

Is an Imperial gallon the same as a US gallon?

No. Imperial gallons and US gallons are separate volume units with different fixed definitions, so identify which gallon is specified before converting.