EV Charging Cost Calculator

How Much Does It Cost to Charge an Electric Vehicle?

EV charging cost depends on your electricity tariff, battery capacity, current state of charge (SoC), and charger efficiency. This calculator helps you compare home vs public charging costs and estimate cost per kilometre.

The Formula

Charging Cost = Energy Added (kWh) × Electricity Tariff ($/kWh) Energy Added (kWh) = Battery Capacity × (Target SoC% − Current SoC%) / 100 / Charger Efficiency

Charging Speeds

| Level | Power | Full Charge Time (75kWh EV) | |-------|-------|------------------------------| | L1 (120V/12A) | 1.4kW | ~54 hours | | L2 (240V/32A) | 7.7kW | ~10 hours | | L2 Home (240V/48A) | 11.5kW | ~6.5 hours | | DC Fast (Level 3) | 50–350kW | 20–80 min |

Practical Examples

Example 1: Tesla Model 3 (75kWh battery), charging from 20% to 80% at $0.15/kWh home tariff. Energy = 75 × 0.6 = 45kWh. Cost = 45 × 0.15 = $6.75 for 300+ km range.

Example 2: Same car at DC fast charger ($0.40/kWh). Cost = 45 × 0.40 = $18.00 — still far cheaper than gasoline.

Cost Per Kilometre

If the car uses 15kWh/100km and electricity is $0.15/kWh: Cost per km = 0.15 × 15/100 = $0.0225/km vs ~$0.12/km for a petrol car.