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Fuel Economy Converter

Convert vehicle fuel economy metrics across international standards: km/L (India/Japan), US MPG, Imperial MPG (UK), and L/100km (Europe).

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Input Fuel Unit:
Calculation Results
Metric Fuel Economy (km/L)
15 km/L
Equivalent to 6.67 Litres per 100km
US MPG
35.28 MPG
UK Imperial MPG
42.37 MPG
L/100km
6.67 L/100km
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How to use the Fuel Economy Converter

  1. 1Enter fuel economy number.
  2. 2Select the input unit (km/L, MPG US, MPG UK, L/100km).
  3. 3Instantly view equivalent ratings across all standard metrics.

How Fuel Economy is Calculated

Applies exact metric-to-imperial conversion coefficients: 1 US MPG = 0.425144 km/L; L/100km = 235.215 / US MPG.

Mathematical Formula
km/L = MPG (US) × 0.425144 L/100km = 100 / km/L MPG (UK) = MPG (US) × 1.20095
Formula Variables & Logic

L/100km is an inverse metric (lower is better), whereas MPG and km/L are distance-per-volume metrics (higher is better).

Worked Example: Converting 15 km/L to MPG and L/100km
Sample Calculation
Scenario: A compact car rated at 15.0 km/L.
Step-by-step breakdown
  1. 1US MPG = 15 / 0.425144 = 35.28 MPG
  2. 2UK MPG = 35.28 × 1.20095 = 42.37 Imperial MPG
  3. 3L/100km = 100 / 15 = 6.67 L/100km
Estimated Result
15.00 km/L equals 35.28 US MPG (6.67 L/100km).

What affects Fuel Economy results

  • Differences between US Gallon (3.785 L) and UK Imperial Gallon (4.546 L).
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Frequently Asked Questions

Why is UK MPG different from US MPG?

The UK Imperial gallon (4.546 litres) is approximately 20% larger than the US liquid gallon (3.785 litres), so the same car receives a higher numerical MPG rating in the UK.

How do I convert L/100km to US MPG manually?

Divide 235.214 by the L/100km figure. For example, 8.0 L/100km equals 235.214 / 8.0 = 29.4 US MPG.

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