UK Energy Bill Calculator 2026
Free UK energy bill calculator. Estimate monthly and annual electricity and gas costs based on usage (kWh), tariff rates, and standing charges. Plan household energy spending and compare supplier tariffs.
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Calculator inputs
Energy Usage
Your results
- This calculator uses the unit rates and standing charges you enter — it does not assume the Ofgem price cap, which changes every three months and can sit above or below what any individual supplier actually charges. Use the figures from your latest bill for an accurate result.
- A standard variable tariff tracks the Ofgem price cap, which is reset every three months — so the rates you entered are a snapshot, not a fixed cost for the year ahead.
- Your electricity use is about typical for a household of this size (Ofgem medium benchmark).
- Your gas use is around 26% above typical for a household of this size (Ofgem medium benchmark).
Sources & methodology
- Formula:
- Annual usage cost
- Reference:
- Ofgem
Calculation type: Exact calculation. Figures are taken from Ofgem — see sources below.
Formula & methodology
Formula used
Annual usage cost
Usage cost = annual kWh × unit rate (p/kWh) ÷ 100Unit rates are quoted in pence, so they are converted to pounds. Electricity and gas are costed separately because their rates differ.
Annual standing charge
Standing charge = daily charge × 365A fixed daily cost for being connected. It is payable even if you use nothing at all.
Solar offset
Billable electricity = max(0, usage − solar generation)Self-consumed solar generation reduces the units you buy, but cannot take the bill below the standing charge.
Total annual bill
Total = electricity (usage + standing) + gas (usage + standing) − direct debit discountBoth fuels are combined, then any discount for paying by direct debit is applied.
Variable definitions
| Symbol | Meaning | Unit |
|---|---|---|
| kWh | Annual consumption. Units of electricity or gas used in a year, shown on your bill or annual statement. | kWh/year |
| Unit rate | Price per kWh. The per-unit price on your tariff, quoted in pence per kWh. | p/kWh |
| Standing charge | Daily fixed charge. A fixed daily amount for each fuel, payable regardless of consumption. | p or £ per day |
Step-by-step calculation
- 1. Take your figures from a real billAnnual kWh, unit rates and standing charges are all printed on your energy statement — using estimates makes the result an estimate too.
- 2. Cost the units for each fuelMultiply annual consumption by the unit rate, converting pence to pounds.
- 3. Add the standing chargesMultiply each daily charge by 365 and add both fuels.
- 4. Apply solar and any discountDeduct self-consumed solar generation from electricity units, then subtract any direct debit discount from the total.
Limitations
- Rates are the ones you enter. This calculator holds no Ofgem price cap data and cannot tell you the current cap or what your supplier charges.
- The price cap limits unit rates and standing charges, not your total bill — a capped tariff still costs more if you use more.
- Assumes a single flat unit rate per fuel. Economy 7, time-of-use and tracker tariffs charge different rates by time of day and are not modelled.
- Energy use is highly seasonal. An annual figure spread evenly across twelve months will understate winter bills and overstate summer ones.
- Solar is treated as a straight reduction in units bought. Export payments, battery storage and the timing mismatch between generation and use are not modelled.
- VAT on domestic energy and any government schemes or rebates are not applied separately — enter rates inclusive of VAT if your bill shows them that way.
This page is educational. It applies a standard formula to the figures you enter and shows the arithmetic behind the result. It is an estimate, not an offer, a quotation or financial advice: real costs depend on the provider's pricing, fees and underwriting, and on circumstances this calculator does not collect.
Sources & references
- Reference dataReview of typical domestic consumption values (TDCV) — decision, effective 1 July 2026 — OfgemSource of the benchmark annual usage figures this calculator compares your meter readings against. Ofgem cut the medium household benchmark to 2,500 kWh electricity and 9,500 kWh gas from 1 July 2026.
- RegulationEnergy price cap and standing charges explained — OfgemExplains why a standard variable unit rate and standing charge are reset quarterly, which is the reason this calculator asks you to enter the rates from your own bill rather than assuming them.
Frequently Asked Questions
Clear answers to common questions to help you use this calculator confidently.
How is my UK energy bill calculated?
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How is my UK energy bill calculated?
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UK energy bills = (kWh usage × unit rate) + standing charge. Suppliers charge a fixed daily standing charge plus variable per-unit rates for electricity and gas. This calculator factors in both to estimate your total monthly and annual costs.
What are typical UK electricity and gas rates in 2026?
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What are typical UK electricity and gas rates in 2026?
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Rates vary by supplier and region (Ofgem price cap). As of 2026, electricity averages around 24p/kWh and gas around 6p/kWh, but rates change quarterly. Check your latest bill to enter accurate rates into this calculator.
Does this calculator include Ofgem price cap regulations?
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Does this calculator include Ofgem price cap regulations?
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This calculator estimates bills based on rates you enter. Ofgem sets price caps that suppliers must follow, which change quarterly. Enter your supplier's current rates to see realistic estimates under price cap regulations.
How can I reduce my energy bills in the UK?
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How can I reduce my energy bills in the UK?
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Reduce usage through insulation, LED bulbs, and efficient appliances. Compare suppliers annually—switching can save £100-300/year. Use this calculator to test different usage scenarios and budget accordingly.
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