Energy Tariff Cost Comparison
Compare energy offers using the electricity and gas you expect to use. Enter each tariff's unit rates and standing charges to see a like-for-like cost estimate rather than relying on a headline annual figure.
Calculation breakdown
How to use this tool
- Use annual kWh from a recent bill.
- Enter rates and standing charges from each offer.
- Add relevant fees and compare the same dates and usage.
How the result is calculated
Estimated cost combines usage charges with daily standing charges. Fees and confirmed discounts are then included for the selected comparison period.
Worked example
At 25p per kWh and a 50p daily standing charge, 3,000 kWh over 365 days costs £932.50 before any additional fees or adjustments.
What this result does not cover
The result is not a supplier quote. Variable rates, consumption and future tariff changes can alter the bill.
Questions people ask
Is the price cap my maximum annual bill?
No. Your bill still depends on usage and applicable rates.
Should I enter prices including VAT?
Use the stated basis and select the matching setting to avoid adding it twice.
Can a lower unit rate cost more overall?
Yes. Standing charges and fees can offset the saving.
Supported scope and official sources
User-entered domestic energy quotes only. No market feed or price-cap prediction. Annual use is spread evenly over the comparison dates.
- www.ofgem.gov.uk — check if energy price cap affects you
- www.gov.uk — vat on fuel and power notice 70119
Source snapshot: 21 October 2026. Independent specialist review is pending. Calculations do not confirm eligibility or replace official decisions.