Fixed vs variable energy tariff calculator
Enter your usage, unit rates and standing charges for a variable tariff and a fixed deal to see the projected cost difference over 12 months. Tariff prices change often and depend on your postcode and usage.
Enter 0 if electricity only
Default: October 2026 price cap
Default: October 2026 price cap
Example: cheapest fixed deal shown by The Energy Shop on 27 October 2026, averaged across Manchester, Glasgow and London. Standing charges vary by deal and region. Enter the figures from your own quote.
Example: cheapest fixed deal shown by The Energy Shop on 27 October 2026, averaged across Manchester, Glasgow and London. Standing charges vary by deal and region. Enter the figures from your own quote.
Example: cheapest fixed deal shown by The Energy Shop on 27 October 2026, averaged across Manchester, Glasgow and London. Standing charges vary by deal and region. Enter the figures from your own quote.
Example: cheapest fixed deal shown by The Energy Shop on 27 October 2026, averaged across Manchester, Glasgow and London. Standing charges vary by deal and region. Enter the figures from your own quote.
Enter any exit fee you would pay to leave your current tariff. Enter 0 if on a variable tariff.
12-month cost comparison
On your current variable rate
£1,724 total | £1,724/year
On the fixed tariff rate
£1,880 total | £1,880/year
Difference over 12 months
£157
Based on these rates, the fixed tariff costs approximately £157 more over 12 months than staying on the variable rates entered.
Compare fixed and variable tariffs at your postcode
These projections are illustrative. Use the partner comparison tool to see live fixed and variable tariffs available at your address.
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See how the cap has changed over time in our price cap history chart, or estimate your full annual bill with the annual bill estimator.
Read our guide: Fixed vs variable energy tariffs
See also: The energy loyalty penalty: why staying costs more