How do I calculate difference in price?

Kostandia

Hello, my 81 year old mum took the Eon 2 year fixed tariff in November, as the energy crisis kicked off. How can I calculate if the unit & standing price differentisls of the fixed tariff is better or worse than the new April price cap rises? 
....here are the rate differentials:
Eon electricity 23.46p Ofgem 28p
Eon gas 4.84p  Ofgem 7p
....the unit rates look better than Ofgem, right?

But the gas standing charge looks horrific:
Eon elec standing 4.84p  Ofgem 7p
Eon gas standing 48.22p Ofgem 27p
...how can i decide if the very high Eon standing charge for gas (double!!) makes the Ofgem price cap across all 4 charges a better deal for my mum than the Eon fixed tariff?
Thank you, Kiki

JGB1955

You've muddled up those standing charges somewhere...  

Gerry1

Forget Ofgem figures, just do the sums based on her annual consumption derived from actual meter readings together with E.On's published tariff in your region, and don't forget VAT.

If you can't find E.On's April figures, use EDF's which will be very similar.

Benny2020

Ofgem standing charges will be 45p and 27p 

[Deleted User]

You start by looking at the annual consumption in kWh per year for both electricity and gas. Bear in mind though that a fix is a fix. Your Mother will be protected from changes to the Ofgem Cap in Oct 2022; April 2023 and October 2023. The Office for Budget Responsibility is predicting a £800 increase in the Cap in Oct 2022.

QrizB

You've got those tariff numbers muddled somewhere.

For an average gas customer using 12000kWh/yr, saving 1p/kWh on gas is worth 32p/day. Your mum is saving more than double that, so an extra 21p/day on the standing charge isn't a big deal.

Your mum would need to be using less than 4000kWh/yr of gas for the extra standing charge to make the new tariff a worse deal.

otb666

i find money saving supermarket useful just put in as standard prices (after getting quote on your tariff)this shows calculations and comparisons and i double check my own figures using this.  Not sure if this counts as a soft search though on credit file (but dont need credit and no debt)