Octopus tariff optimiser
Find the cheapest electricity tariff for your home setup
This is a free UK calculator. Enter your figures to get an instant, personalised result — no signup, no email capture, no upsell.
Frequently asked questions
Which Octopus tariff is cheapest?
Depends on your setup — Go for EV-only homes, Cosy for heat pumps, Flux for solar+battery, Agile for flexible users. The tool ranks them all for you.
Do I need a smart meter?
Yes for any time-of-use tariff (Go, Cosy, Flux, Agile). Standard variable doesn't require one.
Are these the live Octopus rates?
Snapshot rates as of 2026 — always verify with Octopus before switching, as time-of-use tariffs update regularly.