Marine & NauticalImperial Gallons to Liters

Imperial Gallons to Liters

Methodology·How We Verify

Snapshot

1 Imperial Gallon equals 4.54609 Liters.

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.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

4.54609 Liters (L)

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API and AI agent access

Imperial Gallons to Liters.

Machine-readable identifiers

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

Use these identifiers in the API request. Sources and model limits also apply to software clients.

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/"
  }
}

API, OpenAPI and WebMCP 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

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.