Energy Bill Calculator Trending

Your energy bill is made up of two components: a daily standing charge and a unit rate for the energy you actually use. The standing charge covers the cost of maintaining your connection to the gas and electricity networks. The unit rate is the price per kilowatt-hour (kWh) of energy consumed.

The Ofgem energy price cap sets the maximum unit rates and standing charges that suppliers can charge on default tariffs. The cap is updated quarterly. Typical household consumption is approximately 2,700 kWh of electricity and 11,500 kWh of gas per year.

This calculator lets you enter your actual meter readings or estimated consumption to see your expected annual bill. You can compare different tariff rates to see potential savings from switching.

How the Ofgem energy price cap works. Set quarterly (Jan/Apr/Jul/Oct). Caps unit rates (p/kWh) and standing charges (p/day) for default tariff customers. Reflects wholesale costs (50-60%), networks (20-25%), policy costs (10-15%), supplier margin (3-5%). 2026 typical cap: electricity ~24p/kWh + 53p/day standing; gas ~6p/kWh + 32p/day standing. Average dual-fuel household pays £1,600-£1,800/year — down from peak ~£3,500 in early 2023.

Should you fix your energy tariff? Fixed deals add 5-15% premium above the current cap. If cap rises 20%+ during fix, you win. If cap falls (it has multiple times in 2024-2025), you lose. Watch wholesale gas futures + Ofgem announcements. Fix when prices are stable/falling for certainty; stay on cap when prices are volatile but trending downward. Octopus, EDF, OVO, Eon, British Gas all offer fixed deals — compare via switching sites (uSwitch, MoneySavingExpert).

Time-of-use tariffs for smart meter homes. Octopus Agile (half-hourly wholesale-tracked): rates 0-30p/kWh, occasionally negative on sunny windy days. Octopus Go (EV tariff): 7-9p/kWh between 00:30-05:30, ~30p/kWh peak. Octopus Cosy (heat pump tariff): cheap rates morning + evening, expensive midday. EV owners on Go save £600-£1,200/year vs flat-rate. Heat pump owners benefit similarly. Solar panel owners with TOU tariffs sell excess generation back at 15-20p/kWh.

How to cut UK energy bills (in priority order). (1) Switch to a better tariff (£100-£300/year savings); (2) Reduce consumption — turn down thermostat 1°C (£100-£150/year), close curtains at night, draught-proof doors/windows (£100-£200), wash at 30°C (£50/year), short showers (£50-£100/year); (3) Insulation — loft insulation (£50-£150/year), cavity wall (£100-£250/year); (4) Solar panels (£500-£1,400/year after payback); (5) Heat pump (variable, often slightly more efficient than gas boiler depending on tariff and insulation).