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EV calculator

EV Miles per kWh Calculator

Calculate EV efficiency from measured miles and electricity used.

Use this calculator

Enter measured miles and energy used.

What your result means

Miles per kWh measures how far an EV travelled for each kWh used. Higher miles per kWh means lower electricity use for the same distance; use measured energy and miles where possible.

Worked example

210 miles using 60 kWh:

Efficiency
3.5 miles/kWh
Electricity per 100 miles
28.57 kWh

Efficiency connects directly to charging cost at a chosen tariff.

Formula

miles/kWh=miles travelledkWh used\text{miles/kWh}=\frac{\text{miles travelled}}{\text{kWh used}}

Efficiency reference

Miles/kWhkWh per 100 miles
2.540
333.33
3.528.57
425
4.522.22
520

Using the result

Use miles/kWh to compare like-for-like journeys and convert it to cost with your tariff.

Assumptions and limitations

  • Temperature, speed, terrain, load and auxiliaries affect measured efficiency.

Helpful questions

Is higher miles per kWh better?

The result changes directly with the values entered; real-world driving and charging conditions can differ.

How does it affect charging cost?

The result changes directly with the values entered; real-world driving and charging conditions can differ.

Is this the same as kWh per 100 miles?

The result changes directly with the values entered; real-world driving and charging conditions can differ.

Should I use battery or billed energy?

The result changes directly with the values entered; real-world driving and charging conditions can differ.

Why does winter reduce efficiency?

The result changes directly with the values entered; real-world driving and charging conditions can differ.

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