21 L/100km to MPG
| 21 L/100km | = | 11.2 MPG (US) |
| 21 L/100km | = | 13.5 MPG (UK / Imperial) |
| 21 L/100km | = | 4.76 km/L |
How to Convert L/100km to MPG
The conversion is inverse: L/100km measures fuel per unit of distance, while MPG measures distance per unit of fuel. The formula is a division, not a multiplication.
- MPG (US) = 235.21458 ÷ L/100km
- MPG (UK) = 282.48094 ÷ L/100km
Applying the formula to 21 L/100km: 235.215 ÷ 21 = 11.2 MPG (US).
Is 21 L/100km good?
21 L/100km equals 11.2 MPG (US), which is considered Poor — typical of large trucks, RVs, and heavy-duty vehicles. In Imperial units, that is 13.5 MPG (UK), and in km/L it equals 4.76 km/L.
Need a different value? Use our L/100km to MPG Converter.
Similar Conversions
| L/100km | MPG (US) | MPG (UK) |
|---|---|---|
| 16 L/100km | 14.7 | 17.7 |
| 17 L/100km | 13.8 | 16.6 |
| 18 L/100km | 13.1 | 15.7 |
| 19 L/100km | 12.4 | 14.9 |
| 20 L/100km | 11.8 | 14.1 |
| 22 L/100km | 10.7 | 12.8 |
| 23 L/100km | 10.2 | 12.3 |
| 24 L/100km | 9.80 | 11.8 |
| 25 L/100km | 9.41 | 11.3 |
Related Fuel Economy Converters
MPG to L/100km
Reverse conversion: miles per gallon to liters per 100 km.
MPG to km/L
Miles per gallon to kilometers per liter, used in India, Japan and Brazil.
km/L to MPG
Kilometers per liter to miles per gallon.
Fuel Consumption Calculator
Compare all fuel-economy units in one place.
L/100km to UK MPG
Looking for UK MPG instead? Imperial gallons are larger.
Conversion factors verified against NIST, BIPM
Based on SI definitions (BIPM).
Last reviewed: March 2026
