Fuel Economy Converter
Compare vehicle efficiency ratings across US, Canadian, UK, and metric formats.
Choose units
Enter a value, pick the units, and the conversion updates instantly.
Quick converter. Results update locally in your browser.
Fuel economy can be distance-per-fuel or fuel-per-distance. For L/100 km, lower is better; for MPG and km/L, higher is better.
Conversion notes
Companion units, sanity checks, and precision notes.
What this means
30 MPG (US) converts to 7.84 L/100 km. The reverse check is 30 MPG (US), which is useful for spotting unit-entry mistakes.
Copy result
Copy a short conversion note for your own worksheet. CalcShelf does not save the input.
| Unit | Converted value | Based on |
|---|---|---|
| L/100 km | 7.84 L/100 km | 30 MPG (US) |
| MPG (US) | 30 MPG (US) | 30 MPG (US) |
| MPG (imperial) | 36.03 MPG (imperial) | 30 MPG (US) |
| km/L | 12.75 km/L | 30 MPG (US) |
- Converted value
- 7.84 L/100 km
- Based on
- 30 MPG (US)
- Converted value
- 30 MPG (US)
- Based on
- 30 MPG (US)
- Converted value
- 36.03 MPG (imperial)
- Based on
- 30 MPG (US)
- Converted value
- 12.75 km/L
- Based on
- 30 MPG (US)
Fuel-use sensitivity
Lower L/100 km and liters per 1,000 km are better; higher MPG and km/L are better. This compares the entered vehicle against ±10% fuel-use scenarios.
| Scenario | L/100 km | MPG (US) | km/L | Fuel for 1,000 km | Fuel use vs entered |
|---|---|---|---|---|---|
| 10% less fuel used | 7.06 | 33.33 | 14.17 | 70.56 L | 90% |
| Entered economy | 7.84 | 30 | 12.75 | 78.4 L | 100% |
| 10% more fuel used | 8.62 | 27.27 | 11.59 | 86.25 L | 110% |
- L/100 km
- 7.06
- MPG (US)
- 33.33
- km/L
- 14.17
- Fuel for 1,000 km
- 70.56 L
- Fuel use vs entered
- 90%
- L/100 km
- 7.84
- MPG (US)
- 30
- km/L
- 12.75
- Fuel for 1,000 km
- 78.4 L
- Fuel use vs entered
- 100%
- L/100 km
- 8.62
- MPG (US)
- 27.27
- km/L
- 11.59
- Fuel for 1,000 km
- 86.25 L
- Fuel use vs entered
- 110%
Watch-outs
- Make sure the source and destination units are from the same measurement family.
- Verify regulated, safety-critical, or tolerance-sensitive work against authoritative references.
Rounded for quick checks. For regulated, safety-critical, or tolerance-sensitive work, verify the required precision before using the number.
Example
30 MPG (US) = about 7.84 L/100 km.
Notes
For L/100 km, lower is better. For MPG and km/L, higher is better. The sensitivity table shows how a 10% fuel-use change affects fuel needed for 1,000 km.
- Use the same drive cycle when comparing vehicles: city, highway, combined, WLTP, EPA, or NRCan.
- Real fuel use changes with speed, tires, load, weather, terrain, and maintenance.
- For cost planning, multiply liters for your trip or annual distance by your local fuel price.
Use the Fuel Economy Converter without guessing what to do next
- Start with the example values to see what the main result looks like.
- Replace the example values with the best numbers you have right now; rough estimates are fine for a first pass.
- Change one input at a time so you can see which assumption actually moves the answer.
What the result means
The result is the same measurement written in a different unit. The main job is to avoid mental math mistakes and unit mix-ups.
How to use it
Check the unit you are starting with and the unit you actually need before copying the number. Most conversion mistakes are wrong-unit mistakes, not calculator mistakes.
What can change it
Rounding can matter for recipes, shipping, lab work, purchasing, and engineering. Use enough decimal places for the job, then verify the required precision.
Good for
Compare North American and Canadian fuel-economy units.
Check this next
Try Speed Converter, Distance Converter, Power Converter to cross-check the same decision from another angle.
Best habit
Run a conservative case and an optimistic case. The gap between them is often more useful than a single answer.
Common uses
- Compare North American and Canadian fuel-economy units.
- Convert MPG to L/100 km.
- Compare vehicle efficiency ratings.
Common questions
Is the Fuel Economy Converter private?
CalcShelf calculators run without an account. Your entries stay in the calculator while you work; CalcShelf does not save them or place your numbers in shareable links.
How accurate is the Fuel Economy Converter?
It uses standard unit relationships and practical rounding. For regulated work, lab use, purchasing specs, or safety-critical tolerances, confirm the required precision.
What should I check after using the Fuel Economy Converter?
Verify the source unit, target unit, required decimal precision, and any industry-specific rounding rule before copying the number.
Which calculator should I try next?
Try Speed Converter, Distance Converter, Power Converter as next checks so you can compare the same decision from another angle before acting.
Method behind the estimate
Unit converters use fixed published relationships between measurement units, with rounding chosen for readable everyday results.
Why the detail matters
For purchasing, lab, recipe, shipping, or engineering work, match the target unit system and check whether the destination needs a different precision.
No account or saved inputs
Your calculator values are for your session. CalcShelf does not require an account, save calculator entries, or add your numbers to shareable URLs.
Copy or print safely
Use any copy, print, or worksheet controls as local handoff tools for your own notes, supplier calls, lender questions, or implementation checklist. They are there to help you explain the result to a human.
Before acting
Treat the result as a decision draft, not a verdict. Recheck the source numbers, run a downside case, and verify the real-world rule, quote, label, or spec that controls the final answer.
Last reviewed: May 11, 2026. See methodology and editorial policy for formulas, assumptions, rounding, review approach, and limitations. For regulated, lab, shipping, cooking, or engineering use, confirm the exact unit convention and required precision.