EV Charging Cost Calculator
What will it cost to keep your EV charged? Combine your home and public charging, use your own rates, and see a monthly estimate in Canadian dollars.
Build your charging budget
How to calculate EV charging cost
1. Match the energy basis
A dashboard consumption figure usually describes energy used by the vehicle. Billed or wall energy includes charging losses. Check how your source defines its figure; official ratings can include charging losses. Choose the matching basis so losses are applied only once.
2. Use the cost of extra electricity
Use the per-kWh cost of the electricity your EV adds. Include applicable variable delivery charges and taxes. For time-of-use or tiered plans, use the rate for the hours or tier you actually charge in, or an energy-weighted average. Existing fixed household service charges are not added automatically.
3. Separate energy from other fees
Public charging can add session, time, parking, idle or subscription charges. Put known extra amounts in the fees field. A per-minute tariff cannot be treated as a per-kWh rate unless you estimate the energy delivered and the time billed.
The method
Replenishment energy = monthly km × kWh per 100 km ÷ 100
Home billed kWh = energy × home share ÷ home efficiency
Public billed kWh = energy × public share ÷ public efficiency
Total CAD = home billed kWh × home rate + public billed kWh × public rate + fees
CAD per 100 km = total CAD ÷ monthly km × 100
For billed/wall consumption, both efficiency divisors are 1. At zero km, cost per 100 km is not applicable.
Example: 1,200 km at 18 battery kWh/100 km requires 216 kWh in the battery. An 80/20 home/public split with 90%/95% efficiency uses 192 home billed kWh and about 45.5 public billed kWh. At illustrative CAD 0.15 and 0.55 per kWh, the total is CAD 53.81, or CAD 4.48 per 100 km, before any extra fees.
Charging Cost FAQs
Is this a complete cost-of-ownership calculator?
No. It estimates charging energy and any extra fees you enter. Vehicle purchase, insurance, financing, repairs, depreciation, charger installation and household fixed costs are outside this calculation.
Will this compare electricity plans for me?
No. It uses one entered home rate and one public rate. A time-of-use plan comparison needs your household load, charging schedule, time blocks, tiers and fixed charges. A single rate cannot capture those effects.
Does the home/public split count charging sessions?
No. It is a share of replenishment energy on the basis you selected. In battery mode, it allocates battery energy before each charging-efficiency adjustment. In billed mode, it allocates billed energy; for different measured home/public consumption, run those portions separately and add them.
Why do efficiency inputs turn off for billed energy?
Your billed or wall consumption already includes losses between the billing meter and the battery. Applying another adjustment would double count them. Efficiency inputs are ignored on this basis, even if numbers remain visible.
Can I estimate winter charging cost?
Yes, use an energy-consumption figure that already reflects the winter conditions you expect. This calculator applies no temperature or winter penalty. Avoid adding a winter increase twice.
Rate examples: Hydro-Québec EV savings calculator and BC Hydro charging rates. Checked October 4, 2026. Always verify current rates and tax treatment.