EV Charging Cost Calculator
What does a charge actually cost at home? Enter your battery size, the charge range you normally use, and your electricity rate.
Your results
Worked example
A 60 kWh battery charged from 20 to 80 percent, at $0.15 per kWh, using 18 kWh per 100 km:
- Charge added: 80 − 20 = 60 percent, and 60 kWh × 0.60 = 36 kWh
- Cost per charge: 36 × $0.15 = $5.40
- Cost per 100 km: 18 × $0.15 = $2.70
- Range added: 36 ÷ 18 × 100 = 200 km
How this calculator works
Charging is not perfectly efficient; roughly 5 to 10 percent of the energy from the wall is lost as heat, so your bill will be slightly higher than the figure shown. Public fast chargers price by the minute or by the kWh at rates well above home electricity, so use the station's rate in the rate field to compare honestly.
Common questions
Why charge only to 80 percent?
Most manufacturers recommend an 80 to 90 percent daily limit to slow battery wear, and charging slows sharply above 80 percent anyway. Charging to 100 percent before a long trip is fine; living at 100 percent is what ages the battery.
How much cheaper is off-peak charging?
In Ontario, off-peak time-of-use energy is roughly half the on-peak price before delivery and fees. On the example above, moving the same charge fully off-peak can cut the per-charge cost close to in half, which is why most EVs have a charge scheduler built in.
Estimates only. Results are provided for planning purposes and are based on the figures and assumptions shown on this page. Actual cost varies with charging losses, temperature, and your rate plan. Mississippi Maple accepts no liability for decisions made using this calculator.