Fixed vs variable energy calculator
Enter the fixed deal you have been offered. We price it against the capped rates that are actually published, and say plainly where the comparison runs out of data.
- No registration
- No email required
- Instant calculation
- Latest official Ofgem data
What this can and cannot tell you
It can tell you exactly how a fixed offer compares with the capped rates Ofgem has published. It cannot tell you what the cap will be after those periods, because nobody has published that — and we will not pretend otherwise by projecting a number.
Fixing buys certainty. Whether that certainty is worth its price is the judgement the figures should inform.
Mistakes that change the answer
- Comparing a fixed unit rate against the capped unit rate while ignoring different standing charges.
- Forgetting exit fees on the fixed deal.
- Treating a forecast of future cap levels as a fact.
Common questions
Should I fix my energy tariff?
Where do the capped rates come from?
See whether you could pay less
Your results above are based on official Ofgem figures and your own numbers. Switching is optional and nothing here changes what the calculation says.
Compare your tariff against anotherAffiliate disclosure — commercial links never change your results or the Ofgem figures we show.