L/100km to MPG Converter
Convert liters per 100 km to US MPG for comparing international vehicle fuel economy.
How It Works
Formula: L/100km to MPG = 235.214583 ÷ value
Example: 8 L/100km = 29.401823 MPG
Note: L/100km converts to US MPG using MPG = 235.215 ÷ (L/100km), based on the US gallon.
Common Uses
Quick Conversion Table
| L/100km | MPG |
|---|---|
| 10 | 23.5215 |
| 20 | 11.7607 |
| 25 | 9.4086 |
| 30 | 7.8405 |
| 40 | 5.8804 |
| 50 | 4.7043 |
Rounding Rule
Rounded to 2 decimal places
Error Margin
±0.01 MPG
Precision Guidance
For car shopping, round to 1 decimal. For comparison, keep 2 decimals.
Common Mistakes
The relationship is inverse: a lower L/100km gives a higher MPG. Do not multiply directly.
Frequently Asked Questions
What is 8 L/100km in MPG?
8 L/100km equals 29.40 MPG using the formula MPG = 235.215 ÷ (L/100km).
How do I convert L/100km to MPG?
Divide 235.215 by the L/100km value. For example, 235.215 ÷ 8 = 29.40 MPG.
Is a lower L/100km better?
Yes. Lower L/100km means higher MPG and better fuel economy.
Is this the US gallon?
Yes, this converts to US MPG using the US gallon (3.785 L).
Deep Dive Guide
L/100km to MPG: Convert European Fuel Economy to US Ratings
Convert L/100km to MPG using the exact inverse formula (235.215 / L/100km). Compare European fuel economy ratings with US MPG for car shopping and travel.
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Exact Constants & Authoritative Sources
Every conversion on this page uses the fixed, internationally agreed constants below — drawn from NIST and the SI Brochure. No values are estimated or rounded as if exact. See the full list on our Sources & Standards page.
- EXACT1 US MPG → L/100 km: L/100 km = 235.214583 ÷ MPG (exact, US gal = 3.785411784 L, 1 mi = 1.609344 km)
- EXACT1 US MPG = 0.425143707 km per litre (exact)
- EXACT1 Imperial MPG (UK) uses a 4.54609 L gallon — not interchangeable with US MPG
Common Pitfalls & How to Avoid Them
US MPG vs. UK MPG
A UK gallon is 4.54609 L, so 40 UK MPG ≈ 33.3 US MPG. Comparing trans-Atlantic fuel figures directly overstates economy.
L/100 km is inverse
Higher MPG = better; higher L/100 km = worse. Use L/100 km = 235.214583 ÷ US MPG, never a straight subtraction.
A unit-conversion reference site has no manufacturer-specific or device calibration parameters, so "layered tuning" does not apply here. The only real error-handling is input validation: the converter rejects non-numeric, empty, or out-of-range entries and shows a clear message, then falls back to exact constants above. No estimated or rounded figures are ever presented as exact.
Authoritative sources for this page
- NIST (U.S. National Institute of Standards and Technology) — NIST SP 330 — The International System of Units (SI), 2019 edition
Last Updated 2026 | This converter was reviewed for accuracy