EV Winter Range Calculator
See how an assumed range reduction changes the distance available between your starting charge and your reserve. You choose the assumptions; this tool does not predict the weather.
Set up a range scenario
How the winter range estimate works
1. Choose a full-charge baseline
A rated range or a measured mild-weather full-charge range can be a starting point. Rated range is not a promise for a particular route. Do not enter a partial-charge dashboard range and reduce it again for starting charge.
2. Choose one reduction
The percentage is your assumption about the difference from that baseline. It is not calculated from temperature. If you already measured range in similar winter conditions, use that full-charge figure with a 0% additional reduction, or model only a further change.
3. Keep a charge reserve
The estimate uses the charge available above your chosen reserve. A reserve at or above the starting charge returns zero. Real charging availability, detours and conditions need separate planning; this tool cannot tell you a trip is safe or a charger will be available.
The method
Scenario full-charge range = baseline range × (1 − assumed reduction ÷ 100)
Available charge fraction = max(starting charge − reserve, 0) ÷ 100
Distance before reserve = scenario full-charge range × available charge fraction
Example: A 400 km baseline with a 25% assumed reduction becomes 300 km at full charge. Starting at 80% and retaining a 10% reserve makes 70 percentage points available. The scenario distance is 300 × 0.70 = 210 km.
What evidence can and cannot tell you: CAA reported 14–39% less range than official ratings in its February 2025 winter test, conducted at approximately −7°C to −15°C. That was a specific test of different vehicles and configurations, not a universal rule or an extreme-cold boundary. The comparison percentages above are illustrative assumptions, not predictions derived from that study.
Winter Range FAQs
Why is there no temperature slider?
Temperature alone cannot determine a reliable range loss for every EV. Battery and cabin heating, drive speed, wind, road conditions, model, state of charge and trip length all matter. This tool lets you explore transparent assumptions instead of implying a precise forecast.
Should I apply this to a range figure I measured in winter?
Only if you want to model an additional reduction from that measured baseline. For the same winter conditions, use a full-charge winter range with 0% additional reduction. Applying the same winter reduction twice would understate range.
Does a 25% reduction mean I use 25% more energy?
No. Under an otherwise simplified model, 25% less range corresponds to dividing the original energy use per kilometre by 0.75, or about 33% more energy per kilometre. This tool models range reduction directly and does not also increase energy consumption.
Can I use this to guarantee I will reach a destination?
No. The result is an estimate from your assumptions, not a navigation or safety system. Consult your vehicle, live route and charging information, changing conditions and your own contingency plan before travelling.
Background: CAA winter EV road test, February 10, 2025; Natural Resources Canada: EV charging. Reviewed October 4, 2026.