# kWh/100 km to MPGe Converter

> Convert kilowatt-hours per 100 kilometers to Miles Per Gallon Equivalent (MPGe) for EPA electric vehicle efficiency comparison

**Category:** Conversion
**Keywords:** kwh per 100 km, mpge, ev efficiency, electric vehicle, epa rating, metric to imperial
**URL:** https://complete.tools/kwh-100-km-to-mpge-converter

## How it works

The conversion relies on two key constants established by the EPA and the international system of units. First, the EPA defines one gallon of gasoline equivalent as exactly 33.705 kilowatt-hours of energy. Second, one mile equals exactly 1.609344 kilometers. The conversion proceeds in two steps:

Step 1 — Convert kWh/100 km to kWh/100 miles by multiplying by the km-per-mile factor:
kWh/100 mi = kWh/100 km x 1.609344

Step 2 — Calculate MPGe by dividing the energy in one gallon equivalent (expressed on a per-100-miles basis) by the vehicle's consumption:
MPGe = 3370.5 / kWh per 100 miles

Combining both steps into a single formula gives:
MPGe = 3370.5 / (kWh/100 km x 1.609344)

This can also be approximated as MPGe = 2094.2 / kWh per 100 km. The tool also derives miles per kWh (100 / kWh per 100 mi) and kilometers per kWh (100 / kWh per 100 km) so users can evaluate efficiency in distance-per-energy terms rather than energy-per-distance terms. The range estimate section uses these figures to project how far common battery sizes (40 kWh, 60 kWh, and 80 kWh) could travel on a full charge at the entered efficiency level.

## Who should use this

1. EV shoppers comparing vehicles listed in kWh/100 km (common on European spec sheets) against EPA MPGe ratings published in the United States.
2. Fleet managers operating electric vehicles across regions that use different efficiency metrics, who need a single point of comparison for total cost of ownership analysis.
3. Automotive journalists and reviewers translating manufacturer-provided European consumption figures into the MPGe format familiar to North American readers.
4. Environmental researchers and policy analysts benchmarking EV efficiency improvements over time using a consistent unit of measurement.
5. EV owners tracking their real-world energy consumption from onboard trip computers (often displayed in kWh/100 km) and wanting to see how their driving compares to official EPA MPGe ratings.
6. Ride-share and delivery fleet operators evaluating which electric vehicles offer the best energy economy for their specific route profiles.

## Worked examples

Example 1 — Tesla Model 3 at 15.5 kWh/100 km:
kWh/100 mi = 15.5 x 1.609344 = 24.94 kWh/100 mi
MPGe = 3370.5 / 24.94 = 135.1 MPGe
mi/kWh = 100 / 24.94 = 4.01
km/kWh = 100 / 15.5 = 6.45
This places the Model 3 in the "Excellent" efficiency tier.

Example 2 — Nissan Leaf at 19.0 kWh/100 km:
kWh/100 mi = 19.0 x 1.609344 = 30.58 kWh/100 mi
MPGe = 3370.5 / 30.58 = 110.2 MPGe
mi/kWh = 100 / 30.58 = 3.27
km/kWh = 100 / 19.0 = 5.26
With a 40 kWh battery, this gives an estimated range of about 211 km (131 mi).

Example 3 — VW ID.4 at 18.6 kWh/100 km:
kWh/100 mi = 18.6 x 1.609344 = 29.93 kWh/100 mi
MPGe = 3370.5 / 29.93 = 112.6 MPGe
mi/kWh = 100 / 29.93 = 3.34
km/kWh = 100 / 18.6 = 5.38
With an 80 kWh battery, this gives an estimated range of about 430 km (267 mi).

## Limitations

1. The EPA gallon-equivalent constant (33.705 kWh) is a standardized reference value for comparing fuels and does not account for differences in upstream electricity generation efficiency or well-to-wheel energy losses.
2. Real-world EV consumption varies significantly based on ambient temperature, driving speed, terrain, cabin climate control usage, tire pressure, and payload. The tool assumes a single steady-state efficiency figure and does not model these variables.
3. The built-in vehicle presets represent approximate combined (city and highway) consumption values and may differ from specific EPA window-sticker ratings, which can vary by trim level, wheel size, and model year.
4. MPGe is a U.S.-specific metric defined by the EPA. Other regions may use different equivalence factors or measurement standards, so cross-regional comparisons should be made with caution.
5. Battery degradation over time reduces usable capacity, which means the range estimates shown may overstate the real-world range of older vehicles even if the kWh/100 km figure remains accurate.
6. Charging losses (typically 10 to 15 percent) are not included in the kWh/100 km figure reported by most vehicles, so the actual energy drawn from the grid per 100 km of driving will be higher than the value entered.

## FAQs

**Q:** What exactly is MPGe and why does it exist?


**A:** MPGe stands for Miles Per Gallon Equivalent. The EPA created it to give consumers a familiar reference point for comparing the energy efficiency of electric vehicles against gasoline vehicles. It answers the question: "If the energy in one gallon of gasoline (33.705 kWh) were used to power an EV, how many miles could it travel?"


**Q:** Why is 33.705 kWh used as the energy content of one gallon of gasoline?


**A:** This value is the lower heating value of one US gallon of gasoline as defined by the EPA for fuel economy labeling purposes. It represents the usable thermal energy content and is the standard basis for all MPGe calculations on EPA window stickers.


**Q:** Is a higher or lower kWh/100 km value better?


**A:** Lower is better. A vehicle consuming 15 kWh/100 km uses less energy to cover the same distance than one consuming 20 kWh/100 km. Conversely, the MPGe figure works in the opposite direction — higher MPGe means better efficiency.


**Q:** How do the EV presets in this tool compare to official EPA ratings?


**A:** The presets use approximate combined consumption values commonly reported for these vehicles. Official EPA MPGe ratings may differ slightly because they are measured under controlled laboratory conditions and can vary by model year, trim, and wheel configuration.


**Q:** Can I use this tool for plug-in hybrid vehicles (PHEVs)?


**A:** Yes, but only for the electric-only driving mode. PHEVs have separate efficiency ratings for electric mode and gasoline mode. Enter the electric-mode kWh/100 km figure to see the equivalent MPGe for that portion of driving.


**Q:** Does this conversion account for regenerative braking?


**A:** The kWh/100 km figure from a vehicle's trip computer already includes energy recovered through regenerative braking. So the MPGe result inherently reflects whatever regenerative braking benefit was captured during the drive.

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