Charging Network Cost Comparison

How Charging Network Cost Comparison works

This tool takes a single monthly electricity consumption figure (in kWh) and three per-kilowatt-hour tariff rates—one for home charging, one for public slow chargers, and one for rapid chargers—then scales each to an annual figure by multiplying by 12. The calculator sorts the three results and identifies which network type delivers the lowest total cost over the year. It also computes the difference between the cheapest and most expensive options, offering a clear view of potential savings when different charging strategies are available.

The formula

For each network type i, the annual cost is:
Annual cost_i = kWh_month × 12 × rate_i
where kWh_month is the electricity charged per month and rate_i is the tariff in £/kWh. The tool calculates this for home, public slow, and rapid networks, then ranks them in ascending order. The primary result is the lowest value; the secondary details table shows all three costs plus the spread between the cheapest and dearest.

Where this method is most accurate

The calculation assumes that monthly consumption remains constant throughout the year and that the tariff rates entered are comprehensive—including any connection fees, session charges, or time-based penalties rolled into an effective per-kWh figure. It is most accurate when drivers charge predominantly on one network type or when comparing pure cost differences between networks for a given consumption level. The model does not account for seasonal variation in driving patterns, battery conditioning in cold weather, or charging-curve taper on rapid chargers, all of which can alter real-world kWh requirements and effective rates.

What this tool does not do

This calculator does not recommend which network to use, model charging-curve behaviour (rapid chargers typically taper above 80% state of charge), incorporate time-of-use tariffs or demand charges, or account for subscription discounts offered by some charging networks. It does not estimate the impact of battery degradation, route planning, or the availability of chargers in any location. The output is a straightforward arithmetic comparison of three annual cost scenarios based on the inputs provided; it is not a prediction of actual expenditure or a guarantee of savings.

Disclaimer

This calculator is an educational tool that performs pure arithmetic on user-supplied values. It does not constitute financial advice, vehicle purchase guidance, or a recommendation to join any charging network. Actual charging costs depend on local tariff structures, network availability, payment methods, and individual driving patterns. Always verify current rates with network operators and consult a qualified professional for decisions involving significant expenditure.