EV Charging Cost Calculator

When to round up

Round up for cold weather, charger losses, battery conditioning, public charging fees, demand charges, and paid parking; cost per mile excludes depreciation, insurance, and maintenance.

When to use this calculator

• Estimating monthly or yearly energy cost
• Testing watts, runtime, rate, and duty cycle changes
• Comparing efficient alternatives before buying or changing use

Tips for better estimates

• Use measured watts when possible, especially for appliances that cycle on and off.
• Enter the all-in local electricity rate from a recent bill.
• Rerun the estimate for seasonal use, lower runtime, or a more efficient alternative.

How this estimate was built

This page adjusts battery energy for charging losses, applies the electricity rate, and uses vehicle miles per kWh to separate charging-energy cost per mile from total vehicle ownership cost.

Worked example

Example inputs: Battery energy added: 63 kWh; Charging efficiency: 90 %; Electricity rate: $0.16 /kWh; Vehicle efficiency: 3.5 miles/kWh. With those values, the calculator returns $11.20. This charge costs about $11.20 before public charger fees, demand charges, or parking fees.

Appliance wattage to estimated monthly cost

Example scenarios

• Adding 63 kWh to a battery at 90% charging efficiency draws about 70 kWh from the grid and costs $11.20 at $0.16 per kWh.
• At 3.5 miles per battery kWh, the energy-only charging cost is about $0.051 per mile before public-station, parking, insurance, maintenance, or depreciation costs.
• For time-of-use pricing, run the same charge once at the off-peak rate and once at the peak rate before choosing a charging schedule.

Quick reference chart

Common planning mistakes

Using nameplate watts when actual draw is lower, ignoring duty cycle, using the advertised rate instead of the all-in local rate, and assuming seasonal use stays the same all year.