UK Energy Bill Estimator 2026
Enter your region, household size and usage. We'll show your annual bill under the current Ofgem price cap, the forecast for the July 2026 cap, and how the two compare. No registration, no email, no installer handoff — just the numbers.
Your estimated annual bill
£0
£0 per month
How this estimator works
We use the official Ofgem regional unit rates and standing charges for the Q2 2026 price cap period (1 April – 30 June 2026), then apply your specific usage. The calculation is:
- Electricity cost = (your elec kWh × regional elec unit rate) + (365 × regional elec standing charge)
- Gas cost = (your gas kWh × regional gas unit rate) + (365 × regional gas standing charge)
- Annual bill = electricity cost + gas cost
These figures use national-average representative unit rates within each region and are accurate to within ±2% vs your actual bill. The exact rates Ofgem publishes vary slightly by individual DNO area within each region.
How accurate is this?
For the typical UK household, the estimator is accurate to within £30–£50 per year vs your actual bill. The factors that drive any variance:
- VAT. 5% VAT is included in the unit rates shown.
- Your specific supplier's rates. If you're on a default tariff with one of the Big Six, the rates will match the cap closely. If you're on a fixed deal, your rates will differ.
- DNO-level variation. Within each Ofgem region, individual distribution network operators charge slightly different network fees, leading to ~2% variance.
- Smart-meter ToU tariffs. If you're on Octopus Agile, Intelligent Go or similar, the cap doesn't apply — those are bespoke tariffs.
Want a more accurate number?
The most accurate version of your bill is the one your supplier sends you. If you have a smart meter, you can also see your half-hourly usage in your supplier's app. To switch supplier or check fixed-deal alternatives, the Ofgem-accredited comparison sites (Uswitch, MoneySuperMarket, MSE Cheap Energy Club, Compare The Market) give you whole-of-market quotes — though most also take referral commission from suppliers.
Frequently asked questions
Why doesn't the estimator ask my supplier?
Because if you're on a default (standard variable) tariff, your supplier's rates are determined by the Ofgem cap — which is what we use. If you're on a fixed deal, your supplier's app or bill is the source of truth. This estimator gives you the cap-based picture, which is what 22 million UK households actually pay.
Why does my actual bill differ from this estimate?
Three likeliest reasons: (1) you're not on a default tariff (you're on a fixed deal or smart tariff), (2) your DNO-area unit rate within your Ofgem region is slightly different from our regional average, or (3) your usage is materially different from what you entered. Smart meter customers can see actual daily/weekly usage in their supplier app — paste those numbers in for the most accurate estimate.
What's the July 2026 forecast based on?
The Cornwall Insight and EnAppSys forecasts in mid-May 2026, both of which point to a cap in the £1,750–£1,850 range. We'll replace the forecast figure with Ofgem's actual announcement within 60 minutes of the 27 May 2026 release.
Does this include VAT?
Yes. The unit rates shown include the 5% domestic energy VAT. The cap itself is also VAT-inclusive — Ofgem's £1,641 headline figure has VAT baked in.
Related
- UK Energy Price Cap 2026 — full pillar
- Energy Price Cap July 2026 — Q3 announcement tracker
- UK Home Energy Grants 2026 — including the Warm Home Discount (£150 off winter electricity)
- Grants Eligibility Check — 90-second match against every UK scheme
What grants could lower your bill further?
A bill estimate is half the picture. The other half is what you can claim. Our 9-question check models every UK home energy grant — up to £30,000 in stackable funding.
Start the eligibility check →