ShowDev: I built a free US & UK EV charging cost calculator (2026 Data)

Hey everyone!

Just wanted to share a project I’ve been working on recently. While looking into EV running costs, I noticed that most of the standard EV vs. gas calculators out there are missing a couple of really important real-world factors:

1. They completely ignore the ~10% energy loss when charging at home (Level 2).
2. They don't account for the huge price gap between cheap overnight smart tariffs (like Octopus Go in the UK) and expensive public fast chargers.

So, I decided to build my own simple web tool to fix this:
https://www.evcalculator.online/

It’s a free calculator that lets you easily switch between US ($/Gallon) and UK (£/Litre) modes. You can punch in your exact local electricity rate and daily mileage and see your actual monthly savings compared to a gas or petrol car.

While building the tool, I ended up diving deep into the 2026 charging rates and wrote a few guides based on the data. If anyone is curious about the actual numbers, I put them here:

• Tesla Model Y Home Charging Cost in the US:
  https://www.evcalculator.online/blog/tesla-model-y-home-charging-cost-us

• Chevy Equinox EV vs Superchargers:
  https://www.evcalculator.online/blog/chevy-equinox-ev-charging-cost-at-home-us

• UK Octopus Go vs Price Cap:
  https://www.evcalculator.online/blog/uk-ev-charging-cost-octopus-go-vs-price-cap

• UK Public Network Prices Compared:
  https://www.evcalculator.online/blog/uk-public-ev-charging-network-prices-compared-2026

I'd love for you guys to test it out. If you find any bugs, have ideas for new features, or just want to chat about the SEO/development side of it, let me know in the comments.