EV Charging Cost Calculator
Estimate EV charging cost from your starting battery percentage to a higher target. Use your electricity rate per kWh and charging loss to calculate session cost, cost per 100 miles or 100 km, and monthly charging cost, or compare home charging with another per-kWh rate.
Charging cost estimate
USD · miles
Step 1
Charging session
Enter the charge you want to add and the electricity price you actually pay.
Greater than 0 and up to 300 kWh.
Enter your actual per-kWh rate. No live rate is assumed.
0% to 99%.
1% to 100%, and higher than starting charge.
Enter a planning assumption from 0% to 30%.
Estimate disclaimer: This calculator estimates electricity-related charging cost, not a utility bill or charging-network quote. Actual energy use, charging losses, rates, taxes, and separate fees can differ from the assumptions entered.
How much does it cost to charge an EV?
The cost to charge an electric vehicle (EV) depends mainly on the kilowatt-hours drawn from the grid and the electricity price per kWh. For a partial charge, calculate the battery energy added, adjust for charging loss, then multiply grid energy by the electricity rate.
- Battery energy added = battery capacity × change in state of charge (as a fraction).
- Charging efficiency = 100% − charging loss; use the resulting fraction in the division.
- Grid energy = battery energy added ÷ charging efficiency.
- Charging cost = grid energy × electricity rate.
How EV charging cost is calculated
The calculator first estimates how much energy must reach the battery, then converts that amount to electricity drawn from the grid using your charging-loss assumption.
Battery energy added
Battery capacity × (target charge − starting charge) ÷ 100
Charging efficiency
1 − charging loss (%) ÷ 100
Grid energy
Battery energy added ÷ charging efficiency
Charging cost
Grid energy × electricity rate
If the battery must receive 45 kWh and charging loss is 10%, charging efficiency is 90%. The grid-energy estimate is therefore 45 ÷ 0.90 = 50 kWh. The calculation uses full precision internally and rounds only the displayed values.
EV charging cost per 100 miles or 100 km
Vehicle energy-use figures are not always reported on the same basis. The calculator therefore keeps the driving-cost assumption separate from the charging-session result.
Battery-side energy use
Charging loss is applied before estimating electricity cost because the entered energy use represents energy consumed from the battery.
Grid-side energy use
No additional charging loss is applied because the entered energy-use figure already represents electricity drawn from the grid.
This choice affects only the optional driving-cost estimate. It does not change the battery, state-of-charge, charging-loss, or session-cost calculation.
For battery-side input, grid energy per 100 distance units = vehicle energy use ÷ charging efficiency. Cost per 100 distance units = grid energy × electricity rate. For grid-side input, multiply the entered energy use directly by the rate without adding loss again. US mode uses 100 miles; CA mode uses 100 km. To express the estimate as EV charging cost per mile or kilometre, divide the per-100 cost by 100.
How to estimate monthly EV charging cost
Monthly energy = vehicle energy use per 100 distance units × monthly driving distance ÷ 100. If the input is battery-side, divide by charging efficiency to estimate purchased grid energy; if it is grid-side, do not add charging loss again. Multiply monthly grid energy by the electricity rate for EV charging cost per month.
Worked example
How much does it cost to charge an EV from 20% to 80%?
75 kWh battery, 20% to 80%, $0.18/kWh, and 10% charging loss.
Battery energy: 75 × 60% = 45 kWh. Grid energy: 45 ÷ 0.90 = 50 kWh.
The charge increase is 60% and charging efficiency is 90%. The battery receives 45 kWh, but 50 kWh must be drawn from the grid because 10% of that grid energy is not stored in the battery.
Charging cost: $9.00
Driving cost
30 kWh/100 miles, 900 miles/month, $0.18/kWh, and battery-side energy use.
Grid energy per 100 miles: 30 ÷ 0.90 = 33.33 kWh.
$6.00 / 100 miles · $54.00 / month
Rate comparison
The same 50 kWh session at $0.18/kWh and $0.48/kWh.
Your rate: $9.00. Comparison rate: $24.00.
Difference: $15.00 more at the comparison rate.
Home vs public EV charging cost
Home charging normally uses your household electricity rate. Public Level 2 charging and DC fast charging may use different per-kWh rates and add session, time, parking, idle, membership, or other fees. Home electricity rates are often lower than public fast-charging rates, but actual pricing depends on the utility, charging network, location, time, membership, and fee structure.
Compare another rate keeps the same estimated grid energy for the session and changes only the entered per-kWh price. It can represent home vs public, peak vs off-peak EV charging cost, a standard vs EV utility tariff, or workplace charging. Extra fees are not automatically included.
For EV charging cost in Canada, use CA mode, a CAD electricity rate, and vehicle energy use per 100 km. Public charging in Canada may be billed by energy, time, flat fees, subscriptions, or a combination depending on the network and location.
What can change the real cost?
Real charging energy can vary with the vehicle, battery temperature, ambient temperature, charger, charging speed, battery conditioning, state of charge, and electrical conversion losses. Driving energy use can also change with speed, weather, terrain, climate control, tires, payload, and driving style.
Public charging may use per-kWh, time-based, per-session, subscription, parking, idle, or combined fees. This calculator does not retrieve charging-network tariffs or live utility rates.
This is an electricity-related planning estimate, not the complete cost of EV ownership. Session, idle, parking, membership, activation, time-based or demand charges, fixed utility charges, taxes, and network-specific fees are not included automatically unless already reflected in your entered rate.
Charging time is a different question: use the EV Charging Time Calculator for duration estimates. For gasoline travel expenses, use the Fuel Cost Calculator.
Sources and methodology
The calculation uses your inputs and the formulas above, not current market prices. These references explain charging and measurement context, not a guaranteed bill or a universal loss factor.
- U.S. Department of Energy, Alternative Fuels Data Center — Consumer Guide to Electric Vehicles: home and public charging, including network pricing and Level 2 / DC fast charging.
- Natural Resources Canada — Electric vehicle charging: Costs of EV charging: household electricity costs and energy-based, time-based, flat, and combined public charging fees.
- U.S. EPA — Fuel Economy and EV Range Testing: EPA MPGe figures include charging losses. Check your energy-use source and select grid-side input when it already includes purchased electricity.
Frequently asked questions
How much does it cost to charge an EV?
The electricity cost depends on energy drawn from the grid and the price per kilowatt-hour (kWh). This calculator uses your battery capacity, starting and target state of charge, charging-loss assumption, and electricity rate to estimate that cost. Separate fees are not automatically included.
How do I calculate EV charging cost?
First calculate the battery energy added from battery capacity and the change in state of charge. Then divide by charging efficiency to estimate grid energy and multiply grid energy by the electricity rate.
How much does it cost to charge an EV from 20% to 80%?
For a 75 kWh battery, charging from 20% to 80% adds 45 kWh to the battery. At 10% charging loss, the grid supplies 50 kWh. At an example rate of $0.18/kWh, the estimated electricity cost is $9.00; your actual rate and separate fees may differ.
How much does it cost to charge an EV at home?
Use your household electricity price per kWh, the battery charge you want to add, and a charging-loss assumption. For a time-of-use plan, use the rate for the intended charging period. The result estimates electricity cost, not charger installation or fixed utility charges.
How much does it cost to drive an EV 100 miles or 100 km?
Open the driving-cost section and enter your vehicle's energy use. In US mode the result is shown per 100 miles; in CA mode it is shown per 100 km. You can also choose whether your energy-use figure is battery-side or already measured from the grid.
How do I estimate monthly EV charging cost?
Enter vehicle energy use and monthly driving distance. The calculator estimates monthly battery or grid energy, applies charging loss only when appropriate for the selected energy-use basis, and multiplies the result by your electricity rate.
Is home charging cheaper than public charging?
Home electricity rates are often lower than public fast-charging rates, but the actual comparison depends on the utility, network, location, charging time, membership, and fees. Enter both per-kWh rates to compare the same session. The calculator does not assume that either option is cheaper or automatically add separate fees.
What is EV charging loss?
Charging loss is the share of grid electricity that is not stored in the battery. Power conversion, thermal management, battery conditioning, and related electronics can contribute. Grid energy is battery energy added divided by charging efficiency; loss varies with the vehicle and charging conditions, so there is no universal percentage.
Why can a public charging bill differ from the calculator?
Public charging can use energy-based, time-based, flat, subscription, or combined pricing. Parking, idle, session, membership, taxes, and other charges may change the final bill. The calculator compares entered per-kWh rates, not live network tariffs, and does not automatically add separate fees.
Can I use this calculator to estimate Tesla charging cost?
Yes. It works for Tesla vehicles and other EVs when you enter the appropriate usable battery capacity, starting and target charge levels, electricity rate, and charging loss. It does not maintain Tesla model specifications or live Supercharger pricing and is not affiliated with Tesla.