EV Real-World Range Calculator
The number on the window sticker is a lab average. Enter your EPA-rated range, your typical driving speed, and the outside temperature to get a more realistic estimate of what you'll actually see.
How this is calculated
This applies two independent adjustment factors to your EPA-rated range: one for speed, one for temperature, based on the general pattern found across published real-world EV range testing (AAA's temperature testing, and highway range tests from outlets like InsideEVs and Recurrent). These are banded approximations, not a precise physics simulation. Real range also depends on your specific vehicle, tire pressure, elevation change, and cargo load, none of which this accounts for.
Speed: aerodynamic drag increases roughly with the square of speed, so highway driving costs meaningfully more range per mile than city or suburban driving. Below 35 mph, stop-and-go driving with regenerative braking often slightly beats the EPA combined rating; above 75 mph, expect a real reduction of around 20 to 30 percent.
Temperature: cold hits range from two directions: the battery itself is less efficient when cold, and cabin heating draws real power a gas car gets essentially free from waste engine heat. The effect gets sharply worse below freezing. This calculator's cold-weather bands assume you're running the cabin heater, which is the realistic default for most cold-weather driving.
Worked example
Take a 300-mile EPA-rated EV on a winter highway trip: 75 mph and 25°F outside. The speed band for 66 to 75 mph is a 20 percent reduction; the temperature band for 20 to 31°F is a 25 percent reduction. Combined (not simply added), that's 300 × 0.80 × 0.75, or 180 miles, a 40 percent drop from the rated number. The same car at 30 mph in mild 70°F weather would see roughly 330 miles, a 10 percent gain over the rated figure.
Frequently asked questions
Why does the calculator use bands instead of a smooth curve?
Because a smooth formula would imply more precision than the underlying data actually supports. Real-world range studies report results in ranges, not exact percentages, and it varies by vehicle. Bands are an honest way to show "roughly this much impact" without pretending to a level of accuracy that doesn't exist.
Does this account for using climate control?
The temperature bands assume typical cabin heating use in cold weather, since that's the realistic default. If you're running the AC hard in extreme heat, expect a modest additional reduction this calculator doesn't separately account for; heating generally costs more range than cooling because it can't rely on a heat pump as efficiently in very cold conditions.
Why is my real range sometimes higher than the EPA rating?
EPA combined ratings blend a city cycle and a highway cycle. Slower, stop-and-go driving lets regenerative braking recover energy that highway driving never gets back, so genuinely low-speed city driving in mild weather can outperform the rated number. It's not a calculator error; it reflects how the official test is actually averaged.
Should I use this instead of the EPA rating when planning a trip?
Use it as a more realistic starting point, then still build in a safety buffer. Our road trip charging planner lets you enter a "full-charge range" directly, so plug the adjusted number from here into that calculator instead of the sticker figure for a more accurate stop count.
Does battery age affect this too?
Yes, separately from speed and temperature. Most EV batteries retain the large majority of their original capacity for many years, but some gradual loss is normal. This calculator assumes a battery at or near full original capacity; an older, higher-mileage EV should expect somewhat less range than shown here on top of the speed and temperature adjustments.
Why do speed and temperature multiply instead of add?
Because they're independent effects acting on the same trip. If speed cuts range by 20 percent and cold cuts it by 25 percent, adding them would suggest a 45 percent loss, but the correct way to combine two independent percentage reductions is to multiply the remaining fractions (0.80 × 0.75), which gives a 40 percent total loss, not 45 percent. It's a small difference at moderate adjustments but a meaningful one in the more extreme bands.
For the full breakdown of how the EPA test itself works, see our range rating guide.