Fuel EconomyMiles per US Gallon to Kilometers per Liter

Miles per US Gallon to Kilometers per Liter

Methodology·How We Verify

Snapshot

1 Miles per US Gallon equals 0.425144 Kilometers per Liter.

Reference basis: This conversion uses a fixed factor based on reference unit definitions.
Example: For 5 Miles per US Gallon, the result equals 2.125719 Kilometers per Liter.

Interactive conversion

Converter Calculator

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

0.425144 Kilometers per Liter (km/L)

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API and AI agent access

Miles per US Gallon to Kilometers per Liter.

Machine-readable identifiers

Conversion family: fuel-economy
Source unit: miles_per_us_gallon
Target unit: kilometers_per_liter

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": "fuel-economy",
  "value": 1,
  "from": "miles_per_us_gallon",
  "to": "kilometers_per_liter"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "fuel-economy",
    "value": 1,
    "from": "miles_per_us_gallon",
    "to": "kilometers_per_liter",
    "result": {
      "raw": 0.425143708033,
      "display": "0.425144"
    },
    "canonicalPath": "/fuel-economy/miles-per-us-gallon-to-kilometers-per-liter/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

The converter converts miles per us gallon into kilometers per liter using liters per 100 kilometers as the shared normalization basis. The factor stays fixed for this route, so the direct answer, calculator, common values, and mirror Kilometers per Liter to Miles per US Gallon page all use the same fuel-economy definitions.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Miles per US Gallon = 0.425144 Kilometers per Liter.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Miles per US Gallon (mpg (US))	Kilometers per Liter (km/L)
5	2.125719
10	4.251437
15	6.377156
20	8.502874
25	10.628593
30	12.754311
40	17.005748
50	21.257185
60	25.508622
80	34.011497

Questions & answers

Frequently Asked Questions

Does this page use fixed fuel-economy standards only?

Yes. This cluster uses fixed metric, US, and UK fuel-economy standards only, with every route normalized through liters per 100 kilometers.