EV Trip Energy & Cost Calculator

Plan the energy needs for your next road trip, adjusting for real-world conditions.

Last Updated: January 2026

Inputs

Currency

Trip Distance

Vehicle Efficiency (Rated)

Your average efficiency in mild conditions.

Electricity Cost (Avg)

$ /kWh

Use average DC fast charging rate for trips.

Range Penalty (Speed/Cold/Wind)

Mild (0%) 0% Harsh (40%)

Slide right for highway speed, cold weather, or heating use.

Trip Results

Total Energy Needed (+Loss) -

Estimated Trip Cost -

Cost per mi -

Real Efficiency (Est.) -

How it Works

We calculate the total energy by adjusting your rated efficiency for environmental factors like speed and temperature.

The Formula

Real Efficiency = Rated Efficiency × (1 - Penalty%)

Trip Energy = Distance / Real Efficiency

Note: Penalties are additive. Driving 75mph might be a 15% penalty. Freezing temps might be another 20%.

Frequently Asked Questions

How much penalty should I add for highway driving?

For highway driving (70-75 mph), efficiency typically drops by 15-20% compared to city/mixed driving ratings.

What about winter?

Cold weather affects both battery chemistry and cabin heating demands. Expect a 20-30% range loss in freezing temperatures without a heat pump, or 10-20% with one.