Road Trip Charging Stops
Estimate how many charging stops and how much total time a long EV road trip will take.
The 10-80 rule
Long-distance EV trips work best when you stop charging at about 80% and hit the road again, because charging speed drops sharply above 80%. The same logic applies at the low end: arriving at a charger with 10% in the tank is the sweet spot — not so low you’re panicked, but low enough that the battery accepts the fastest possible charge.
This calculator assumes you start fully charged, drive down to 10%, then top up to 80% at each stop. So your first leg uses 90% of the battery and each subsequent leg uses 70%.
The math
Worked example
A 500-mile trip in an EV with a 280-mile range, at 65 mph, charging 25 minutes per stop: first leg covers 252 miles, leaving 248 miles. At 196 miles per stop that’s 2 stops. Drive time 7 hr 42 min, charging 50 min, total about 8 hr 30 min.
Real trips need padding. Highway driving at 70–75 mph cuts range, cold weather cuts it more, and hills, headwinds and full payload add up. For real route planning — including actual charger locations and speeds — use a tool like A Better Route Planner (abrp.app). This calculator gives you the rough “will I make it” shape of the day.
Frequently asked
What is the "10-80" charging rule?
For road trips: arrive at a charger with about 10% battery left, charge to 80%, and hit the road. Below 10% you risk stranding; above 80% the DC fast charge rate drops sharply. So you cover ~70% of battery range between stops and spend less time charging.
Why not charge to 100% at each stop to need fewer stops?
The last 20% of a charge typically takes as long as the first 60% because battery chemistry forces the rate to drop near full. Charging 80→100% can add 25–40 minutes of stop time for relatively few extra miles. It is almost always faster to stop more often and charge less each time.
How does cold weather affect this estimate?
Cold cuts your effective range 25–40%, so legs get shorter and you may need extra stops. Charging is also slower below 0°C unless you precondition the battery on approach. Pad your range estimate downward in winter (e.g., a 280-mile EV becomes a 200-mile EV in deep cold).
What if a charger is out of order?
Always have a backup planned 30–60 miles before your target stop. PlugShare check-ins and the network apps (Tesla, EA, EVgo) show real-time station status. Modern routing tools (A Better Route Planner, Tesla nav, manufacturer apps) automatically route around offline stations.
How does this calculator differ from A Better Route Planner?
This gives you the rough shape of a day — how many stops, total time, charging vs driving. ABRP knows the specific chargers on your route, their power, traffic, weather, and the exact charge curve of your car — it is the right tool for an actual trip plan.