EV Efficiency Converter: kWh/100 km, Wh/mi, mi/kWh, MPGe

Enter one EV efficiency figure in any unit and see it in all the others, metric and U.S.

How it works

Everything is converted through kWh per 100 miles. 1 mile = 1.609344 km exactly (NIST), so kWh/100 km = kWh/100 mi ÷ 1.609344. Wh/mi = kWh/100 mi × 10. mi/kWh = 100 ÷ kWh/100 mi; km/kWh = mi/kWh × 1.609344. MPGe = 3,370.5 ÷ kWh/100 mi (EPA's 33.705 kWh per gallon). Le/100 km = kWh/100 km ÷ 8.9 (Natural Resources Canada: one litre of gasoline is equivalent to 8.9 kWh).

Worked example: 30 kWh/100 mi = 30 ÷ 1.609344 = 18.64 kWh/100 km = 300 Wh/mi = 186.4 Wh/km = 3.33 mi/kWh = 5.36 km/kWh = 112.35 MPGe = 18.64 ÷ 8.9 = 2.09 Le/100 km.

Assumptions

Pure unit conversion. It does not change how efficient a car is or predict real-world use.
MPGe uses EPA's 33.705 kWh per U.S. gallon; Le/100 km uses NRCan's 8.9 kWh per litre. The two factors are rounded differently (33.705 ÷ 3.785412 L per gallon = 8.904 kWh per litre), so they are not perfectly consistent with each other.
U.S. (EPA) and Canadian (NRCan) label values for the same car may not convert exactly into each other because of rounding on each label.
EPA label kWh/100 mi and MPGe include Level 2 AC charging losses; a dashboard Wh/mi figure usually does not.

Frequently asked questions

How do I convert kWh/100 km to miles per kWh?

Divide 62.137 by the kWh/100 km figure, because 100 km = 62.137 miles (1 mile = 1.609344 km). For example, 18.64 kWh/100 km ≈ 3.33 miles per kWh.

What is Le/100 km?

Natural Resources Canada's EnerGuide rating for electric vehicles converts kWh/100 km into gasoline litres equivalent per 100 km (Le/100 km), using the fact that one litre of gasoline contains the energy equivalent to 8.9 kWh.

How do I convert Wh/mi to kWh/100 miles?

Divide by 10: 300 Wh per mile = 0.3 kWh per mile = 30 kWh per 100 miles.

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Sources

Formulas and reference values are from these sources. Page last reviewed 2026-10-19.