40 MPG to km/L
| 40 MPG (US) | = | 17.0 km/L |
| 40 MPG (US) | = | 48.0 MPG (UK / Imperial) |
| 40 MPG (US) | = | 5.88 L/100km |
How to Convert MPG to km/L
This conversion is linear (a simple multiplication), unlike MPG ↔ L/100km. Both units measure distance per unit of fuel, so they scale proportionally.
- km/L = MPG (US) × 0.42514371 (exact: 1.609344 km/mi ÷ 3.785411784 L/gal)
- km/L = MPG (UK) × 0.35400622 (exact: 1.609344 km/mi ÷ 4.54609 L/gal)
Applying the formula to 40 MPG (US): 40 × 0.4251 = 17.0 km/L.
Is 40 MPG good?
40 MPG (US) is considered Very good — typical of efficient sedans and compact cars. In km/L terms, that equals 17.0 km/L. In other units: 40 MPG (US) = 48.0 MPG (UK) = 5.88 L/100km.
Need a different value? Use our MPG to km/L Converter.
Similar Conversions
| MPG (US) | km/L | L/100km |
|---|---|---|
| 35 MPG | 14.9 | 6.72 |
| 36 MPG | 15.3 | 6.53 |
| 37 MPG | 15.7 | 6.36 |
| 38 MPG | 16.2 | 6.19 |
| 39 MPG | 16.6 | 6.03 |
| 41 MPG | 17.4 | 5.74 |
| 42 MPG | 17.9 | 5.60 |
| 43 MPG | 18.3 | 5.47 |
| 44 MPG | 18.7 | 5.35 |
| 45 MPG | 19.1 | 5.23 |
Related Fuel Economy Converters
Conversion factors verified against NIST, BIPM
Based on SI definitions (BIPM).
Last reviewed: March 2026
