US gallons per 100 miles fuel economy unit.
US gallons per 100 miles to Kilometers per liter Converter — gal/100 mi to km/L
Convert US gallons per 100 miles (gal/100 mi) to Kilometers per liter (km/L) using the exact conversion factor (1 us gallons per 100 miles = 42.51437074 kilometers per liter). See the formula, worked examples, conversion table, history, and common uses.
US gallons per 100 miles to Kilometers per liter converter
Converter
Fuel Economy Converter
Convert MPG, km/L, L/100 km, and related transport fuel economy units.
Context values
Some unit families need one extra value for a physically accurate result.
Kilometers per liter fuel economy unit.
Normalize fuel economy to distance per volume, inverting consumption units when needed.
Fuel economy supports both distance-per-volume and volume-per-distance units.
Reserved above the conversion cards and below the converter.
About Converting US gallons per 100 miles to Kilometers per liter
US gallons per 100 miles and Kilometers per liter are two of the ways the world measures fuel efficiency, and converting between them is essential for comparing a US car's window-sticker rating to a European or Asian one. Specifically: US gallons per 100 miles fuel economy unit, and kilometers per liter fuel economy unit.
Formula
Fuel economy formulas invert between distance-per-volume and volume-per-distance units as needed.
Efficiency-style units (like mpg or km/L) and consumption-style units (like L/100 km) measure the same underlying thing from opposite directions, so converting between the two families requires a reciprocal, not just a multiplication factor.
Simple example
1 gal/100 mi × 2.352146e-14 = 42.51437074 km/L
1 us gallons per 100 miles = 42.51437074 kilometers per liter.
Real-world example
30 gal/100 mi × 2.352146e-14 = 1.417145691 km/L
30 us gallons per 100 miles = 1.417145691 kilometers per liter.
Conversion table
| US gallons per 100 miles (gal/100 mi) | Kilometers per liter (km/L) |
|---|---|
| 10 gal/100 mi | 4.251437074 km/L |
| 20 gal/100 mi | 2.125718537 km/L |
| 30 gal/100 mi | 1.417145691 km/L |
| 40 gal/100 mi | 1.062859269 km/L |
| 50 gal/100 mi | 0.8502874149 km/L |
| 60 gal/100 mi | 0.7085728457 km/L |
Reverse conversion: Kilometers per liter to US gallons per 100 miles
42.51437074 km/L × 4.251437e+13 = 1 gal/100 mi
42.51437074 kilometers per liter = 1 us gallons per 100 miles.
Fuel economy formulas invert between distance-per-volume and volume-per-distance units as needed.
For a page dedicated to this direction, see Kilometers per liter to US gallons per 100 miles.
Understanding the US gallons per 100 miles (gal/100 mi)
US gallons per 100 miles fuel economy unit.
Understanding the Kilometers per liter
Kilometers per liter (km/L) measures fuel economy. Kilometers per liter measures distance traveled per liter of fuel — higher values mean better efficiency, the metric-world counterpart to mpg. It is classified as a Metric unit.
Where it's used: Used in much of Asia and parts of Europe and Latin America for fuel-economy reporting
Uses of the Kilometers per liter today
- Vehicle fuel-economy specifications outside the US and much of Europe
- Motorcycle and small-vehicle efficiency ratings (common in Asian markets)
History of the Kilometers per liter
Km/L is a straightforward metric analog to mpg, following naturally once countries adopted the metric system for both distance and volume; it remains common in markets (e.g. Japan, India, Southeast Asia) where consumers are used to thinking in an 'efficiency' (distance-per-volume) framing rather than 'consumption' (volume-per-distance).
Historical origin. Kilometers per liter was not the invention of a single named person; it developed through the process described above.
Kilometers per liter — sources
- NIST Special Publication 811 — General reference for metric unit conventions.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilometers per liter are in 1 us gallons per 100 miles?
1 us gallons per 100 miles equals 42.51437074 kilometers per liter, using the exact defined conversion factor rather than an estimate.
How do I convert us gallons per 100 miles to kilometers per liter?
Fuel economy units sometimes need inversion rather than simple multiplication — the converter above and the formula section handle this automatically.
How do I convert kilometers per liter back to us gallons per 100 miles?
Use the reverse factor: 1 kilometers per liter equals 42.51437074 us gallons per 100 miles. You can also use the swap control in the converter above to flip the direction instantly.
What is a us gallons per 100 miles?
US gallons per 100 miles (gal/100 mi) is a unit of fuel economy.
What is a kilometers per liter?
Kilometers per liter (km/L) measures fuel economy. Kilometers per liter measures distance traveled per liter of fuel — higher values mean better efficiency, the metric-world counterpart to mpg. It is classified as a Metric unit.
Is the us gallons per 100 miles to kilometers per liter conversion exact?
Yes. Both us gallons per 100 miles and kilometers per liter are defined by fixed standards rather than physical artifacts, so the factor of 2.352146e-14 used above is exact to as many digits as you choose to display.