Standby electricity calculator

Standby consumption depends on the model and enabled features. Network connectivity, quick-start settings and displays can change the load. Enter a measured standby value where possible and only include hours when the devices are in that state.

Formula

Annual standby use = watts per device ÷ 1,000 × standby hours per day × device count × 365. Cost = kWh × your electricity rate. Monthly consumption and cost are annual totals divided by 12.

Worked example

Five devices drawing 2 W each for 20 standby hours a day consume 0.2 kWh daily and 73 kWh annually. Multiply 73 by the price per kWh on your bill to estimate their energy cost.

What the result means

The result identifies whether a measured standby load is worth investigating. If devices have different loads or schedules, calculate them separately rather than using one value for every device.

Electricity price · United Kingdom

£0.2611/kWh is Ofgem’s average capped electricity unit rate for standard variable tariffs paid by Direct Debit in England, Scotland and Wales, valid from 1 July to 30 September 2026. It includes 5% VAT and excludes the separate standing charge. It is not an average across all contracts and does not apply to Northern Ireland. Use your own tariff where available.

Last reviewed: 9 September 2026 · Ofgem · July–September 2026

Enter the unit rate including any applicable tax. Check your bill rather than adding a tax percentage automatically. Standing charges, export payments and subscription fees are separate. Ofgem information applies to Great Britain; Northern Ireland has its own regulator and market arrangements.

Assumptions and limits

The model assumes the same standby pattern every day. It excludes active operation and does not determine whether equipment can safely be disconnected.

Questions answered

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