Electric vs Petrol Cost Calculation — Which Is Cheaper to Run

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Overview

The running cost comparison between electric and petrol vehicles requires calculating energy cost per kilometre for each. The results often surprise people.

The Formula

Petrol cost/km = (Price/litre ÷ km/litre) | EV cost/km = (Price/kWh × kWh/100km ÷ 100)

Standard formula used by professionals worldwide

Worked Example

Step-by-step

Petrol 1.60/L, 12km/L → 0.133/km | EV 0.15/kWh, 15kWh/100km → 0.0225/km → EV 6x cheaper per km

Key Points

Accuracy: Results are as accurate as your inputs
Units: Always use consistent units throughout
Privacy: All CalcHub Pro calculations run in your browser — no data sent anywhere

Frequently Asked Questions

What is the payback period for an EV?

Higher purchase price ÷ running cost savings per year. Typically 3-7 years.

Do EV batteries degrade?

Yes — typically 2-3% capacity loss per year. Most retain 80%+ after 8 years.

Is charging at home cheaper than public chargers?

Significantly — home charging can be 3-5x cheaper than fast public charging.

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