Evrange Estimator Calculator
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Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Estimated Range = (Battery - HVAC) x Efficiency x TempFactor x SpeedFactor x PayloadFactor
Start with the battery capacity, subtract HVAC energy consumption to get usable energy, then multiply by the base efficiency rating adjusted for temperature effects, speed conditions, and payload weight. Each factor reduces the ideal range based on real-world conditions.
Worked Examples
Example 1: Winter Range Estimation
Problem:A 75 kWh battery EV rated at 3.5 mi/kWh drives in 25F weather with 2 kWh HVAC usage, normal speed, and 300 lbs payload.
Solution:Temperature factor at 25F = ~72% (below freezing penalty)\nPayload factor = 1 - ((300-200)/100) x 0.01 = 0.99\nUsable battery = 75 - 2 = 73 kWh\nAdjusted efficiency = 3.5 x 1.0 x 0.72 x 0.99 = 2.49 mi/kWh\nIdeal range = 75 x 3.5 = 262.5 miles\nEstimated range = 73 x 2.49 = 181.9 miles\nRange loss = 262.5 - 181.9 = 80.6 miles (30.7%)
Result:Estimated Range: 181.9 miles | Ideal: 262.5 miles | Loss: 30.7%
Example 2: Summer Highway Trip Estimation
Problem:A 100 kWh battery rated at 3.0 mi/kWh in 85F weather, highway speed factor 0.80, 1 kWh HVAC, 500 lbs payload.
Solution:Temperature factor at 85F = ~97.5%\nPayload factor = 1 - ((500-200)/100) x 0.01 = 0.97\nUsable battery = 100 - 1 = 99 kWh\nAdjusted efficiency = 3.0 x 0.80 x 0.975 x 0.97 = 2.27 mi/kWh\nIdeal range = 100 x 3.0 = 300 miles\nEstimated range = 99 x 2.27 = 224.7 miles\nRange loss = 300 - 224.7 = 75.3 miles (25.1%)
Result:Estimated Range: 224.7 miles | Ideal: 300 miles | Loss: 25.1%
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy