How much does it cost to charge an EV at home per 100 km?

Home charging cost per 100 km equals your vehicle's energy consumption in kWh/100 km multiplied by your home electricity rate. For example, at 17 kWh/100 km and $0.28/kWh, the cost is 17 × 0.28 = $4.76 per 100 km.

How long does a full charge take on a wallbox?

Full charge time equals the battery capacity divided by (wallbox power × 0.9 charging efficiency). For a 60 kWh battery on an 11 kW wallbox: 60 ÷ (11 × 0.9) = 6.06 hours. On a 7.4 kW unit it takes 9.05 hours, and on 22 kW it takes 3.03 hours.

How much can I save annually by charging at home vs using public chargers?

With an 80/20 home-to-public charging mix, annual EV cost is calculated as: annual km ÷ 100 × consumption × (0.8 × home price + 0.2 × public price). At 15,000 km/year, 17 kWh/100 km, $0.28 home, and $0.55 public rates, the mixed annual cost is $691.05 versus $1,402.50 for 100% public — a saving of $711.45 per year.

EV Charging Cost Calculator

Vehicle & Charging Parameters

Battery Capacity

kWh

Energy Consumption

kWh/100km

Annual Distance

km/year

Home Electricity Price

$/kWh

Public DC Charging Price

$/kWh

Wallbox Power

Petrol Reference (comparison)

Assumes 6.5 L/100 km × $1.75/L

Charging Cost Results

Cost per 100 km

Home Charging

—

$/100 km

Public DC

—

$/100 km

Annual Costs

EV (80% home / 20% public) —

EV (100% public) —

Petrol Equivalent —

Annual Saving (mixed vs 100% public) —

Annual Saving vs Petrol —

Full Charge Time

—

hours (0→100%, with 90% efficiency)

Summary

Energy per 100 km	—
Home cost / 100 km	—
Public cost / 100 km	—
Mixed annual EV cost	—
Petrol cost / 100 km	—
Wallbox charge time	—

💡 Why This Matters

The difference between home and public charging can exceed 45%, meaning your annual running costs vary by thousands of dollars depending on your charging habits. Installing a wallbox at home and charging overnight is the single biggest cost reducer for EV owners, often paying for itself within two years through savings alone.

When evaluating EV models, compare real-world consumption figures (kWh/100 km) alongside charging infrastructure availability. Use this calculator to estimate total cost of ownership and explore charging equipment options at TUNA Connect.