EV Efficiency Converter

Convert EV efficiency between Wh/km, Wh/mi, kWh/100 km, kWh/100 mi, km/kWh, mi/kWh, and MPGe, with battery-range and charging-cost context.

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EV efficiency converter Convert EV efficiency between Wh/km, Wh/mi, kWh/100km, kWh/100mi, km/kWh, mi/kWh, and MPGe, then compare battery-range and charging-cost context notes.

Common presets

Remember the direction of efficiency

Wh/km, Wh/mi, kWh/100km, and kWh/100mi get smaller as an EV becomes more efficient. km/kWh, mi/kWh, and MPGe get larger. That is why zero and negative inputs are invalid for this converter.

Quick checkpoints

15 kWh/100km is the same as 150 Wh/km. 4 mi/kWh is about 160.9 MPGe. A lower energy-per-distance figure means the battery goes further for the same stored energy.

Enter an EV efficiency figure Provide an EV consumption or efficiency value to compare the common units, nominal battery range, and simple charging-cost context.

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EV Efficiency Converter

EV efficiency converter: Wh/km, mi/kWh, kWh/100km, and MPGe explained

An EV efficiency converter translates the same electric vehicle energy use into the unit system that best matches the source. That may mean Wh/km or kWh/100km for metric specifications, Wh/mi or mi/kWh for North American and owner-forum discussions, or MPGe for EPA-style label comparisons.

Why EV efficiency units move in opposite directions

Some EV units express energy consumed over a fixed distance, such as Wh/km, Wh/mi, kWh/100km, and kWh/100mi. Lower values in those formats mean the vehicle is using less energy and is therefore more efficient.

Other EV units express distance travelled from a fixed amount of energy, such as km/kWh, mi/kWh, and MPGe. Higher values in those formats mean the vehicle goes farther on the same stored or equivalent energy. That inverse relationship is why a good EV converter cannot use one simple multiplier for every unit.

1 kWh/100km = 10 Wh/km

Metric energy-per-distance values differ only by a scaling factor.

mi/kWh = 100 / (kWh/100mi)

Miles per kilowatt-hour is the inverse of kWh per 100 miles.

1 gallon gasoline equivalent = 33.7 kWh

EPA uses this relationship to express EV efficiency as MPGe.

Where MPGe, mi/kWh, and kWh/100km are useful

MPGe is useful when you want to compare an EV with conventional fuel-economy labels in the United States because it frames the energy use against gasoline-equivalent energy content. It is a labeling and comparison tool, not a direct electricity-bill unit.

mi/kWh and km/kWh are convenient for real driving discussions because they answer the simple question “How far do I go from one kWh?” By contrast, kWh/100km and kWh/100mi are convenient for cost estimation because they tell you the energy needed for a fixed trip length.

Range and charging cost interpretation

A battery range estimate comes from pairing the vehicle efficiency with usable battery energy. If an EV averages 15 kWh/100km, a 75 kWh battery would suggest a nominal range of about 500 km before allowing for reserve, charging buffers, weather, or driving speed.

Charging-cost estimates come from multiplying the energy-per-distance figure by your tariff. That is why kWh/100km and kWh/100mi are especially handy when you want a quick per-trip or per-100-distance cost comparison.

Further reading

Frequently asked questions

Is a higher or lower EV efficiency number better?

It depends on the unit. Lower Wh/km, Wh/mi, and kWh-per-distance figures are better because they mean less energy is used. Higher km/kWh, mi/kWh, and MPGe figures are better because they mean the vehicle travels farther on the same energy.

 What does MPGe actually mean?

MPGe means miles per gallon equivalent. EPA uses it to show how far an EV can travel on 33.7 kWh of electricity, which is treated as the energy equivalent of one gallon of gasoline.

 Is MPGe the same as charging cost?

No. MPGe is a comparison label metric. Charging cost depends on your electricity tariff, charging losses, and the vehicle’s energy use in units such as kWh/100km or kWh/100mi.

 Can I estimate range directly from efficiency?

Yes, but only approximately. Multiply usable battery energy by km/kWh or mi/kWh to get a nominal range, then allow for speed, weather, terrain, HVAC use, and battery reserve.

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