EV Efficiency Calculator
Work out your real-world efficiency from battery capacity, state of charge and distance travelled.
Open calculatorEV Efficiency & Range Calculators
EV Stats helps you understand how efficient your electric vehicle really is. Measure your real-world consumption from a single trip, convert it between Wh/km, kWh/100km and mi/kWh, and estimate how far you can drive between charges — free, instant and in kilometres or miles.
Free EV calculators
EV Range Calculator
Estimate how far you can drive between two charge levels, in kilometres or miles.
Open calculatorEV Efficiency Converter
Translate Wh/km, kWh/100km, mi/kWh and friends into every unit at once.
Open calculatorWhy real-world EV numbers matter
The range and efficiency on a window sticker come from laboratory test cycles — EPA in North America, WLTP in Europe. They’re useful for comparing cars, but they can’t tell you howyour car behaves on your commute, at motorway speeds, or in the middle of January. Real-world consumption regularly differs from the official figure by 10–30%.
Measuring your own efficiency takes one trip: note the battery percentage before and after, divide by the distance. Once you know your true km/kWh or mi/kWh, range anxiety disappears — you can predict charging stops, compare winter and summer driving, and see exactly what a roof box or a heavy foot costs you. Our guides on EV efficiency units and calculating EV range walk through the details.
How it works
- Step 1
Enter your EV’s battery capacity in kWh and your state of charge (SOC) readings, or your average efficiency.
- Step 2
Add the distance travelled or the charge levels you plan to drive between, in kilometres or miles.
- Step 3
Get instant results: average efficiency, energy consumption, and expected driving range.
EV guides
What Is EV Efficiency? kWh/100km, Wh/km and mi/kWh ExplainedThe units behind EV efficiency, what a good figure looks like, and how to measure your own.How to Calculate EV Range: A Practical GuideThe simple maths behind range estimates, with worked examples and winter adjustments.8 Practical Ways to Improve EV Efficiency & RangeProven habits that squeeze more kilometres from every kilowatt-hour.
Frequently asked questions
How do I calculate my EV's efficiency?
Enter your battery capacity (kWh), the state of charge at the start and end of a trip, and the distance travelled. The efficiency calculator works out the energy used and divides distance by it, giving you km/kWh, mi/kWh, kWh/100km or Wh/km.
What is a good EV efficiency?
Most modern EVs achieve 14–20 kWh/100km (155–200 Wh/km or 3.1–4.4 mi/kWh) in mixed driving. Efficient models beat 15 kWh/100km; large SUVs often use more. Compare like for like — weather, speed and terrain all move the number.
How is driving range estimated?
The range calculator multiplies your battery's usable energy (capacity × the SOC window you plan to use) by your average efficiency. Real-world range varies with speed, weather and terrain, so plan with a buffer.
Do the calculators support miles and kilometres?
Yes. Every calculator switches between kilometres and miles, and the efficiency converter translates between Wh/km, kWh/100km, km/kWh, Wh/mi, mi/kWh and kWh/100mi in one step.
Are these EV calculators free?
Yes — every calculator and guide on EV Stats is completely free, with no signup and no app to install. Everything runs in your browser and your numbers never leave your device.