EV Range Calculator
The range number on the sticker is a best case — real EV range depends on battery size, driving speed, weather, and how much charge you actually carry. This calculator estimates usable range, range at your current charge level, cost per 100 miles, and how long Level 1 vs Level 2 charging takes, so a road trip or daily commute stops being a guessing game.
Battery & Efficiency
How EV Range Works
Range is a simple product with one big caveat:
Range = usable battery (kWh) × efficiency (mi/kWh)
Automakers reserve 5-10% of the pack at the top and bottom to protect battery life, so a 75 kWh pack really holds about 67.5 kWh of usable energy. Multiply that by 4.0 mi/kWh and you get ~270 miles. The two inputs that move the number most are speed (air drag rises with the square of velocity) andtemperature (cold thickens the electrolyte and powers cabin heating). That is why the same car can show 320 EPA miles but only 230 on a January highway trip.
Cost and Charge Time at a Glance
Assumes $0.16/kWh residential rate, 75 kWh battery, 4.0 mi/kWh, and charging from the current level.
| EV | Battery (kWh) | EPA Range | Cost / 100 miBest |
|---|
Cost per 100 miles = 100 \u00f7 mi/kWh \u00d7 $0.16. EPA range figures are manufacturer estimates; real range varies with conditions. Charge times use a 90% usable capacity and 80% starting charge.
How to Use This Calculator (3 Steps)
Case Study
Frequently Asked Questions
How is EV range calculated?
Usable battery (kWh) × efficiency (mi/kWh). 67.5 kWh × 4.0 = 270 miles.
Why is my real range lower than EPA?
Highway speed and cold weather cost 15-30% vs the EPA cycle, which averages a moderate 55-60 mph mix.
How much does cold weather reduce range?
12-40% at 20°F depending on cabin heating and battery management. Pre-conditioning while plugged in helps.
How long does it take to charge?
Level 1 adds ~4-5 mi/hr, Level 2 adds 25-35 mi/hr, DC fast chargers reach 80% in 20-45 minutes.
How much does 100 miles of EV driving cost?
About $4.00 at 4.0 mi/kWh and $0.16/kWh — roughly one-third the cost of gas for the same distance.