What is UK Energy Bill + EPC Calculator?
A UK Energy Bill + EPC Calculator computes uk energy bill + epc from the inputs you provide. It applies the standard formula to the values you enter and returns the result instantly, without sending any data to a server. Q4 2024 Ofgem cap (24.50p/kWh elec, 6.24p/kWh gas).
UK Energy Bill + EPC Calculator
Estimate your annual gas + electricity bill from kWh usage. Uses Ofgem price cap rates (24.50p/kWh elec, 6.24p/kWh gas, Q4 2024). See how upgrading your EPC band could save.
Q4 2024 Ofgem price cap: electricity 24.50p/kWh + 60.99p/day standing; gas 6.24p/kWh + 31.66p/day standing. Typical dual-fuel home (2,700 kWh elec + 11,500 kWh gas) bill: about £1,717/yr. Upgrading from EPC D to C typically saves £200 to £400/yr.
Inputs
How to use it
- Read your annual kWh usage off your last bill (look for the "annual usage" or "kWh used in last 12 months" figure).
- Pick your current EPC band - find the certificate at gov.uk/find-energy-certificate.
- Enter your floor area in m² (UK average is ~90 m² for a 3-bed semi).
- Choose your tariff - default (price cap), a fixed deal, or a green tariff.
- Pick a target EPC band to see savings from upgrades like insulation or a heat pump.
About this calculator
The Ofgem price cap (officially the Default Tariff Cap) sets the maximum price a supplier can charge per kWh + per day standing on a default (variable) tariff. Q4 2024 (October to December): 24.50p/kWh electricity + 60.99p/day; 6.24p/kWh gas + 31.66p/day. The cap moves quarterly with wholesale energy prices.
The "typical" annual bill at the cap is £1,717 (Q4 2024) for a household using 2,700 kWh electricity + 11,500 kWh gas. This dropped from a £2,500 peak in 2022-23 (when the Energy Price Guarantee subsidised bills) but is still ~50% higher than 2019 levels.
EPC (Energy Performance Certificate) bands run A (best) to G (worst). The score is calculated kWh of primary energy per m² per year. Bands C and above are increasingly required for new builds + (proposed) for new + existing private rentals (PRS MEES) by 2028. EPC G + F are already not allowed for new tenancies.
Upgrading EPC band typically pays back in 5 to 12 years. Cavity wall insulation £400 to £1,500 (saves £100 to £200/yr), loft insulation top-up £400 to £700 (saves £150 to £250/yr), double glazing £4,000 to £10,000 (saves £100 to £200/yr), heat pump £8,000 to £14,000 (with £7,500 Boiler Upgrade Scheme grant).
Real-world use cases
Switching tariff
Compare your bill on the cap to a fixed deal. Below £1,717/yr typical means the cap is winning for you right now.
EPC upgrade for sale
Improving from D to C can add 1% to 4% to property value + reduce time on market by 25% per UK research.
Landlord PRS MEES compliance
New rentals will need EPC C from 2025 (proposed) and existing tenancies by 2028. Plan upgrades now.
Heat pump payback
Heat pump with £7,500 BUS grant + EPC C upgrade saves typically £400/yr on gas + electricity blends.
What it handles
- Q4 2024 Ofgem default tariff cap rates
- Standing charges + unit rates for elec + gas
- EPC band-based upgrade saving estimate
- Comparison to UK average bill (£1,717/yr)
What it does NOT handle
- Time-of-use / Economy 7 tariff modelling
- Solar PV + export / SEG income
- Battery storage savings
- Specific supplier deals or fix terms
Common mistakes
- Confusing kWh usage with money - the bill includes standing charges of ~£340/yr alone.
- Comparing today’s bill to 2022 prices when the Energy Price Guarantee was active.
- Assuming Scotland or N. Ireland uses the same cap - they differ slightly.
- Believing all green tariffs are 100% renewable - many are partially-matched REGO certificates.
Frequently asked questions
What is the Ofgem price cap right now?
The Q4 2024 (October to December) price cap is 24.50p/kWh + 60.99p/day standing for electricity, and 6.24p/kWh + 31.66p/day standing for gas. The "typical" annual dual-fuel bill at this cap is £1,717. Ofgem updates the cap quarterly.
What is a typical UK energy usage?
Ofgem’s "Typical Domestic Consumption Values" (TDCVs) for medium-use homes: 2,700 kWh electricity + 11,500 kWh gas (gas-heated). Low: 1,800 + 8,000. High: 4,100 + 17,000. Find your actual usage on your bill’s annual summary.
What is an EPC and why does the band matter?
EPC (Energy Performance Certificate) rates a property A to G based on energy efficiency. Required for selling, renting, and new builds in the UK. The energy intensity is in kWh of primary energy per m² per year. Band C is the government’s 2030 target for all PRS rentals.
How much does upgrading EPC band save?
Roughly: D to C saves £200 to £400/yr (insulation, draughtproofing). C to B saves £150 to £300/yr (better heating + windows). E to C saves £400 to £700/yr (full retrofit). Savings depend heavily on home size + heating fuel.
Is a fixed-rate tariff better than the cap?
It depends on where the cap is heading. If you expect the cap to rise (winter / supply shock), fix below the cap and lock in. If you expect it to fall (mild winter / cheap wholesale), stay variable. Fixed deals charge a small "premium" for the certainty.
What is the Boiler Upgrade Scheme?
The Boiler Upgrade Scheme (BUS) gives £7,500 grant towards installing an air-source or ground-source heat pump in England + Wales (£5,000 for biomass boilers). Open to homeowners + small business owners. Reduces typical heat pump installed cost from £14,000 to £6,500.
Are standing charges fair?
They’re widely criticised because low-usage households pay the same fixed daily fee. Ofgem’s 2024 review proposed reform but no changes yet. Standing charges fund grid maintenance + supplier overhead, not your kWh usage.
How do I check my home’s EPC?
Search gov.uk/find-energy-certificate by postcode. Every property sold or rented since 2008 should have one. EPCs last 10 years. If yours is expired or missing, a domestic energy assessor can issue a new one for £40 to £80.