EV Range Estimation: Organize Battery Energy and Efficiency Clearly
An EV range worksheet is arithmetic on assumptions you control: usable battery kilowatt-hours, miles per kilowatt-hour, and an optional reserve percentage. This guide explains that logic in plain language. It is educational only—not a navigation ETA, certified EPA/WLTP label, battery health diagnostic, or weather derate model.
What an EV Range Worksheet Actually Answers
The useful question is not 'What range does the brochure promise?' It is 'If this usable energy and efficiency hold, what planning range appears after my chosen reserve?' A transparent worksheet makes that comparison visible. Real trips change with temperature, speed, elevation, cabin HVAC, and pack degradation that no static mi/kWh encodes. Treat every mile estimate as a scenario you still need to verify with trip logs.
The Inputs That Drive the Math
Most educational EV range worksheets need usable battery kWh, efficiency in miles per kWh, and a reserve percent kept as arrival buffer. Keep one driving style per scenario. If you think in Wh/mi, convert first: miles per kWh = 1000 ÷ Wh per mile.
Battery Inputs and What They Do Not Prove
| Input | What it does here | What it does not prove | Common confusion |
|---|---|---|---|
| Usable battery kWh | Seeds energy after you exclude unavailable buffer | Gross pack marketing capacity | Entering nameplate size as usable |
| Miles per kWh | Seeds constant efficiency for the scenario | All-season real-world average | Copying a brochure without a trip log |
| Reserve % | Excludes a share of usable energy from range | OEM low-SOC warning logic | Treating reserve as guaranteed arrival miles |
| Range miles/km | Planning distance under constant efficiency | EPA or WLTP certification | Comparing one highway run to a sticker |
How the Worksheet Orders the Math
Apply the reserve
Usable energy = battery kWh × (1 − reserve% ÷ 100).
Multiply by efficiency
Range miles = usable energy × miles per kWh.
Convert to kilometers
Range km = range miles × 1.609344.
Stress-test efficiency
Re-run with a lower mi/kWh for cold weather or high-speed highway scenarios.
Keep charging cost separate
Electricity spend belongs in a charging-cost worksheet once distance is known.
Run the EV Range Worksheet
Enter usable kWh, miles per kWh, and a reserve percent:
Open EV Range EstimatorWorked Scenario Without Claiming a Label
Suppose usable capacity is 60 kWh, efficiency is 3.5 mi/kWh, and reserve is 10%. Usable energy after reserve is 54 kWh. Estimated range is 54 × 3.5 = 189 miles, or about 304 km. Drop efficiency to 3.0 mi/kWh and the same reserve yields 162 miles. The worksheet obeys your assumptions; it does not invent an EPA range.
What This Model Intentionally Omits
- Temperature, wind, and elevation derates
- Cabin heat/AC and accessory loads
- Battery degradation curves and cell balancing
- Navigation ETAs and traffic models
- Guarantees matching OEM or sticker range
How to Gather Inputs Safely
Prefer trip-computer usable energy and miles driven ÷ kWh consumed for a representative route. Separate highway and city scenarios. If your vehicle reports a permanent buffer outside the usable number, do not add it again as reserve—pick one buffer story and label it. Convert Wh/mi before entry so units stay consistent.
Bottom Line
EV range basics are about transparent energy arithmetic: usable kWh, an explicit reserve, constant mi/kWh, and miles or kilometers for planning. Keep language cautious, keep buffers labeled, and treat every estimate as a scenario—not a certified label.