About EV Charging Calculator

This site exists because working out what it actually costs and how long it actually takes to charge an electric car in the UK is harder than it should be.

The official charging network apps each show their own prices, but only their own. ZapMap aggregates locations but doesn't compare costs head-to-head. Most calculator sites assume a charger delivers its peak rate from 0% to 100%, which is wrong — charging curves taper sharply above 60-80%, and a Tesla Model Y on a 350kW charger doesn't charge faster than on a 250kW one because the car's peak DC is 250kW.

So we built something that gets the maths right.

What this site does

EV Charging Calculator is a fast, ad-free reference for UK EV charging cost and time. It covers:

• Cost to charge popular UK EVs at every major public network (Tesla Supercharger, IONITY, BP Pulse, InstaVolt, GRIDSERVE and more)
• Cost to charge at home on every common UK EV tariff (Octopus Go, Intelligent Octopus Go, OVO Charge Anytime, EDF GoElectric, plus the standard price cap)
• Time to charge using the actual charging curve for each car, not a naive headline rate
• Cost per mile based on real-world efficiency, not optimistic WLTP
• Subscription break-even analysis for every network that offers one

Every calculation is built on a structured dataset of cars, networks, and home tariffs that we maintain by hand. We don't scrape live prices. We don't republish ZapMap data. The numbers stay accurate as the market moves because someone is actually keeping the data current.

Our proprietary charging model

Our charging model is built from the battery cell up — not copied from third-party test databases. We identify the cell chemistry in each UK-market EV, apply a calibrated physics-based curve model, and produce charging curves that update automatically when manufacturers change cell suppliers (which Tesla did with the UK Model Y in 2024). The model is our own work, calibrated against publicly available manufacturer specifications, and is described openly on the methodology page.

How we keep the data current

EV charging tariffs change quarterly, sometimes more often. Our process:

1. Quarterly review: comprehensive sweep of every network and home tariff, cross-checked against their published rates.
2. Weekly automated check: a Cloudflare Worker tracks the last-modified date of each network's tariff page and flags any changes for manual review.
3. Same-day updates: when a network announces a tariff change, we update the data and redeploy within hours.

Every car entry cites the source of its charging curve (Fastned research, EVDatabase, Bjørn Nyland tests, or manufacturer published specs). Every network entry cites the URL of its tariff page and a last-verified date.

Built for speed

This site loads in under a second on a 3G connection. It weighs less than most images on the alternative EV charging calculators. There are no tracking cookies, no advertising banners (today — we plan to add clearly-disclosed affiliate links for home chargers and EV salary sacrifice schemes, but rankings will never be influenced), no newsletter pop-ups, and no cookie banner because there's nothing to consent to.

The whole site is built on Astro and deployed on Cloudflare's edge network. Every page is static HTML. The calculators are tiny JavaScript islands — only hydrating when you interact with them.

A Supra Digital project

EV Charging Calculator is built and maintained by Supra Digital, a small web development agency in Hertfordshire. It's one of a portfolio of UK reference sites we run on the same principles: fast, accurate, ad-free, free to use.

You can see what else we do at supradigital.co.uk.

Affiliate disclosure

We plan to add clearly-disclosed affiliate links to home charger installers, EV salary sacrifice schemes, and EV-friendly energy tariffs once those partnerships are in place. When we do:

• Affiliate links will be visually marked as sponsored.
• Rankings will be based on price and coverage only, never affiliate rate.
• We'll never recommend a more expensive product because the affiliate rate is better.
• The methodology page will be updated to reflect the partnerships.

Until then, the site is fully reader-supported with no commercial relationships influencing what we publish.

Spotted an error?

Accuracy is the central feature of this tool. If you spot a wrong tariff, an outdated charging curve, a network we should add, or a maths bug, please email hello@evchargingcalculator.co.uk and we'll fix it.

We read every email. Tariff corrections usually go live the same day.

Sources

All tariff data is compiled from each network's published tariff pages, cited per network. Charging curve data is compiled from independent published tests (Fastned research publications, EVDatabase, Carwow range tests, Bjørn Nyland). Home tariff rates are taken from each supplier's published rate cards.

Last comprehensive verification: 2026-04-01

This site is editorially independent. If our funding model ever changes, this page will say so first.