EV Range Calculator
Estimate real-world electric vehicle range accounting for battery capacity, temperature, HVAC usage, and terrain conditions.
About this calculator
EPA window-sticker range figures describe a controlled test cycle, not the mixed conditions most drivers actually see, so this calculator starts from Battery Capacity and Efficiency and layers in the three factors that most commonly separate real-world range from the rated number. Usable Capacity trims the total battery to about 93% of its rated size, a buffer manufacturers reserve at both ends of the charge curve to protect long-term battery health -- it depends only on Battery Capacity and is unaffected by outside temperature or driving conditions. Temperature then adjusts efficiency through a curve that's flattest near 70°F and steepens sharply below 40°F, since lithium-ion chemistry loses power output in the cold and EVs also draw extra energy running a cabin heater; a milder efficiency penalty applies above 95°F for the same underlying reason with air conditioning.
HVAC Running adds a separate fixed energy draw on top of the temperature penalty -- heating pulls roughly 3 kW in cold weather versus about 1.5 kW for air conditioning in hot weather -- while Terrain applies a flat efficiency multiplier: hilly driving cuts efficiency about 15%, and mountain driving about 30%, reflecting the extra energy spent climbing that isn't fully recovered through regenerative braking on the way back down. All of these adjustments compound, which is why cold weather with the heater running in hilly terrain can realistically cut range by 40% or more from the flat, 70°F baseline.
Inputs
Results
Estimated Range
244 mi
≈ 9 marathons
How to Use This Calculator
- Enter the Battery Capacity in kWh for your specific EV.
- Set the Efficiency rating in mi/kWh (from the EPA window sticker or vehicle display).
- Enter the current Temperature (°F) — cold weather significantly reduces real-world range.
- Review Estimated Range in miles, Adjusted Efficiency, and Usable Capacity (kWh) after accounting for conditions.
How the result changes with Battery Capacity
| Battery Capacity | Estimated Range |
|---|---|
| 38 | 124 mi |
| 56 | 182 mi |
| 113 | 368 mi |
| 188 | 612 mi |
What each input means
- Battery Capacity
- Total battery capacity (e.g., Tesla Model 3 LR: 75 kWh, Bolt: 66 kWh).
- Efficiency
- EPA-rated efficiency in miles per kWh (typical EV: 3-4 mi/kWh).
- Temperature
- Outside temperature; cold weather significantly reduces range.
- HVAC Running
- Climate control draws 1.5–3 kW depending on heating vs cooling.
- Terrain
- Hilly terrain reduces range ~15%; mountain driving reduces ~30%.
What each result means
- Estimated Range
- Real-world range after all adjustments.
- Adjusted Efficiency
- Effective efficiency after temperature and terrain.
- Usable Capacity
- Battery capacity available for driving (~93% of total).
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersBattery Capacity = 75, Efficiency = 3.5, Temperature = 70, HVAC Running = 0 = 5 input(s) provided
- Calculate Estimated RangeEstimated Range244 = 244
- Calculate Adjusted EfficiencyAdjusted Efficiency3.5 = 3.5
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why doesn't outside temperature change the Usable Capacity figure?
Usable Capacity represents the portion of the battery's total rated size that's actually available for driving after the manufacturer's health-preserving buffer at the top and bottom of the charge curve -- it's a fixed ~93% of Battery Capacity regardless of conditions. Temperature instead affects range through Adjusted Efficiency, which changes how many miles each kWh of that usable capacity actually delivers, not how much capacity exists in the first place.
How much range does cold weather with the heater running actually cost compared to mild weather?
At this calculator's defaults, dropping from 70°F to 30°F with HVAC on and flat terrain cuts estimated range by roughly 18% (244 miles down to 201 miles on a 75 kWh battery), combining the temperature efficiency penalty with the fixed energy the heater draws over an assumed two-hour drive. Cold-weather range loss is one of the most commonly reported real-world EV ownership surprises precisely because EPA ratings are measured under mild, controlled conditions.
Does a bigger battery always translate into proportionally more estimated range?
Yes -- Battery Capacity scales Usable Capacity directly, and since Usable Capacity is multiplied straight through to Estimated Range along with Adjusted Efficiency, a larger battery increases range in direct proportion as long as temperature, HVAC, and terrain conditions stay the same.
Why does mountain terrain cut range more than hilly terrain even at the same efficiency rating?
Mountain driving applies a steeper efficiency penalty (about 30%) than hilly terrain (about 15%) in this calculator, reflecting that climbing sustained grades demands proportionally more energy than rolling hills, and that regenerative braking on the way back down recovers only part of the energy spent climbing -- the net effect still costs more range than flat terrain.
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
EV Charging Time Calculator
Calculate how long it takes to charge an electric vehicle based on battery size, current charge level, target level, and charger power.
Electric VehiclesEV Road Trip Planner Calculator
Plan an EV road trip by calculating charging stops needed, total trip time, and driving vs charging time breakdown.
Environmental & SustainabilityEV Savings Calculator
Calculate how much you'd save by switching to an electric vehicle, including fuel, maintenance, and CO2 reduction.
Automotive & MotorcyclesEV Charging Cost Calculator
Calculate the cost to charge your electric vehicle at home or at a station. See charging time estimates for Level 1, 2, and DC fast charging.
Electric VehiclesEV Home Charging Cost Calculator
Calculate daily, monthly, and annual EV home charging costs. Compare to equivalent gas prices and see the impact on your electric bill.
More in Automotive & Motorcycles.