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Calculate electric vehicle charging cost by battery size, electricity rate, and charger type. See monthly cost, annual savings vs gas, and charging time estimates.
EV charging cost is calculated by multiplying the energy needed (kWh) by your electricity rate ($/kWh). The energy needed depends on battery size and the charge range (e.g., 20% to 80%).
| Charger | Power | ~Full Charge |
|---|---|---|
| Level 1 (wall outlet) | 1.4 kW | 40-60 hrs |
| Level 2 (home) | 7.6 kW | 8-12 hrs |
| Level 2 (fast) | 11.5 kW | 5-8 hrs |
| DC Fast (50 kW) | 50 kW | 1-1.5 hrs |
| DC Fast (150 kW) | 150 kW | 25-40 min |
| DC Fast (350 kW) | 350 kW | 10-20 min |
Formula
Charging Cost = Battery Size × (Target% − Current%) × Electricity RateBattery Size = total battery capacity in kWh
Target% − Current% = charge range as decimal (e.g., 0.80 − 0.20 = 0.60)
Electricity Rate = cost per kWh from your utility
Worked Example
75 kWh battery, 20% → 80%, $0.14/kWh
Did you know? The average US household spends about $60/month to charge an EV, compared to $150-$200/month on gasoline for a comparable vehicle (source: US Department of Energy, 2024).
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