Econotion / Calculator
Octopus Go cost calculator
Put in your own numbers and it works out a rough yearly cost on Octopus Go against what you pay now, with the working shown under the result.
Econotion · Updated 1 November 2026
Referral link. Econotion is independent and isn't part of Octopus Energy. If you switch to Octopus through a link on this page, Econotion may get a referral payment. It doesn't change the rates you pay. If you're already with Octopus, account and tariff questions go to hello@octopus.energy.
This is an estimate rather than a quote, and it isn't a promise of savings. It assumes you charge 85% to 100% of your miles between 00:30 and 05:30 and that the rest of your use doesn't change. When you pick your region the Go rates load from Octopus's published pricing for the current fix, but Octopus sets the rates so check your own quote before you switch.
If you're not with Octopus yet you join on one of their standard tariffs first, and once they've connected to your smart meter, which Octopus says takes around 14 days, you can move to Go. Check the rates for your postcode on their site before you decide.
How the sums work
- Car kWh = miles ÷ miles per kWh.
- Cost now = (car kWh + home kWh) × your rate, plus 365 × your standing charge.
- Cost on Go = car kWh at the night rate (85% to 100% of it) and the day rate for the rest, plus home use split between night and day by your percentage (plus or minus 5 points), plus 365 × the Go standing charge.
- The range is the best and worst of those combinations.
If the result is small or negative it's down to the day rate, which is well above the price cap, so anything you can't move overnight costs more. Put the dishwasher and washing machine on a timer and run it again.
Why there's no solar or battery box
Solar and batteries change your bill in ways that depend on the tariff, the time of year and how you use them, which a tick box can't capture, and on a tariff like Agile solar doesn't change what you pay for the electricity you import. So the calculator only compares your current tariff with Octopus Go for a household with an EV.
Before you decide
The Go review covers who it suits and how it compares with Intelligent Go, and there's a separate write-up on whether a battery adds up. Octopus's Go page has the current eligibility rules.
Newsletter
Get the new figures when tariffs and grants change
When the price cap, an Octopus tariff or a grant like the Boiler Upgrade Scheme changes, we email you the new figures and which of our guides they affect. That's at most once a month, and we never pass your address to installers or suppliers.