Route Direct
Route Through SuperChargers

EV Model
Speed Multiplier
Cabin Temp (F)
Ext Temp (F)
Payload (lb)

Longer routes take longer to plan, especially the first time they are done (about 20 miles/second, but varies)

Sending request to server...
Energy Markers
Avoid Tolls
Avoid Highways
Unit System1
Charger Radius (miles)
SuperCharger Radius2 (miles)
1This currently applies to the summary table only. Full metric support coming soon.
2Set SuperCharger radius to 0 to see all SuperChargers
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Using the EV Trip Planner

How It Works

EVTripPlanner uses a physics-based model to predict how much energy your EV will use along your route. It accounts for:

  • Speed: this is usually the biggest contributor to variation in energy usage. We use Google Map's traffic-based estimate of current speed, which you can adjust up or down with the 'Speed Factor'.
  • Air density: this varies with temperature and altitude. The same level-road trip at a higher altitude takes less energy than at sea level since the air is thinner. Similarly, the same trip (without air conditioning or heating) takes less energy when it is hotter since the air is thinner. We determine altitude over the route using the Mapquest database and use your input for temperature.
  • HVAC: the heater and air conditioner, as well as any energy required to heat or cool the battery pack, use energy...even when you're not moving. We look at your cabin temperture setting and your estimate of the outside temperature.
  • On-board Systems: the computers and other on-board systems use energy, even when the car isn't moving.
  • Weight & Elevation Changes: the weight of the car and payload (entered) are used along with elevation changes along the route to determine energy used climbing...and recovered during downhills.
  • Friction, efficiency, regeneration: each EV converts electrical energy in the battery to mechanical energy at the wheels a little differently (and vice-versa). We account for these conversions and differences.
  • Your Car Model: each car has different parameters for how they use energy in the categories above. EVTripPlanner takes the best data available to match our model to the actual measurements and published charts.

Trip Settings

Setting the parameters for your trip is critical to getting an accurate estimate of the energy that will be consumed. The most important setting is your "speed factor", which is how much faster or slower than the prevailing speed (as estimated by Google Maps at the time of planning the route) you are going on average. Unfortunately, you can drive in different patterns and have the same average speed while consuming different amounts of energy. While these errors don't tend to be very large for long trips, the closer to "cruise control" you are at the average speed on long segments the closer the estimate will be. Also fill in payload, outside and cabin temperatures and your correct car model - these can make a significant difference.

Interpreting Results

EVTripPlanner has been used to plan over 50,000 routes for thousands of EV drivers. Many drivers report that EVTripPlanner predictions are very accurate - more than any other tool available. But you can't count on it being within let's say, 5%, all the time. You can hit unexpected traffic, weather conditions (especially headwinds) or have to make a last minute detour - so you should always have some margin for safety and a "Plan B" for where you would charge for any trip that is estimated to use more than about 80% of the available energy.

EVTripPlanner reports energy usage in two ways:

  • kilowatt-hours (kWh): this is the actual energy used in direct engineering terms. Unfortunately, the Tesla does not report kWh remaining in the battery, which makes this measurement difficult to use in practice.
  • rated miles: this is how Tesla reports remaining range (rather than kWh). In order to translate the kWh used by EVTripPlanner's model to Tesla (or other EV) rated miles, we need to use some conversion factor. Unfortunately, Tesla does not publish this number and with recent software releases it may not even be the same all the time. Tesla's trip meter also doesn't measure *all* energy used (if you add up energy/miles used plus rated miles remaining, it doesn't add up to the miles you started with after the last charge). We have made our best estimate, and it seems to correlate pretty well.

Since exact weather conditions all along the route are difficult to predict, we provide a sensitivity chart that shows how much energy would be used over a range of winds and temperatures.


We are always interested in your feedback - good and bad, feature requests and defect reports. When providing feedback on route accuracy, please provide your route ID (after the ? in the URL) and information about your drive that might be relevant. Send to

EVTripPlanner is maintained by Ben Hannel (with a little help from the rest of the family). Ben is 16 now and was 15 when he started working on EVTripPlanner. He will be applying for college in the Fall. If you like and use EVTripPlanner, consider making a donation to his college fund with the DONATE button.

Welcome to the latest release of EV Trip Planner! It has a few new features, including:
  • A smarter Auto-Router
  • Trips are no longer limited to 10 waypoints
Coming Soon:
  • Full Metric support
  • Chargers in Europe and Canada
  • Support for the Tesla Roadster
  • Automatic updating of charger database
  • Faster results
Known Issues:
  • Adding the name of a supercharger (e.g. "Buckeye supercharger") will not result in the correct location because Google has not yet learned the addresses of Telsa superchargers. To add the supercharger in the correct location, click the supercharger's icon on the map then click "Charge Here".
  • When you click "Charge Here", the charger is not necessarily added in the correct location in the route. Drag the letter to the left of it to move it.
  • Total times do not include charge time (yet).
  • We update our database of chargers every few weeks. Chargers that are recently opened may not appear immediately.
  • Sometimes when you tab away from the map and tab back, the map area is gray. Just click "Route Direct" again to refresh the map and fix the issue. Full fix coming soon.
Welcome to EV Trip Planner version 2.3!
It has some really cool new features, but a few bugs might have been introduced as well. If you find any, please report them to, and we'll do our best to fix them. In the meantime, you can use the old version