⚡ Interactive UK Appliance Electricity Cost & Smart Plug Savings Calculator
Calculate exact hourly, daily, monthly, and annual running costs in £ GBP across Ofgem Price Cap (24.5p/kWh), Octopus Intelligent Go (7.0p/kWh), and Economy 7 tariffs — plus check BS 1363 13A relay safety.
2026 UK Appliance Wattage & Running-Cost Reference Table (24.5p vs 7.0p Off-Peak)
Below is our laboratory reference chart comparing typical UK household appliances at the 24.5p/kWh Ofgem Standard Variable Price Cap against an automated 7.0p/kWh Octopus Intelligent Go / Economy 7 smart plug schedule:
| UK Appliance | Typical Wattage (230V) | Cost / Hour (24.5p Cap) | Cost / Hour (7.0p Night) | Recommended UK Smart Plug |
|---|---|---|---|---|
| Compressor Dehumidifier (12L–20L) | 240W – 320W (1.2A) | 6.9p / hr | 2.0p / hr | TP-Link Tapo P110M (£11.99) |
| Winged Heated Clothes Airer | 230W – 300W (1.3A) | 7.4p / hr | 2.1p / hr | TP-Link Tapo P110 4-Pack (£31.99) |
| TV + Sky Q + Soundbar Standby | 26W – 38W Continuous | £68.00 / yr idle | £0 (Switched Off) | Tapo P110M / Meross MSS315 |
| Washing Machine / Dishwasher Cycle | 1,800W – 2,100W (Peak) | 29.4p / cycle | 8.4p / cycle | Tapo P110M + Delay Start |
| Espresso Machine (Brass Grouphead) | 1,200W – 1,450W (5.8A) | 3.4p (25m pre-heat) | 1.0p (Off-Peak) | Eve Energy Thread / Tapo P110M |
How to Use the UK Appliance Running-Cost Calculator
Every domestic electrical appliance in the United Kingdom operates on a nominal 230V / 50Hz AC supply protected by a BS 1363 3-pin plug and a BS 1362 cartridge fuse (3A, 5A, or 13A). To work out the exact cost in pence or pounds per hour:
- Check the wattage rating plate on your appliance—or plug it into an energy-monitoring smart socket such as the TP-Link Tapo P110M to read live active power in watts (W).
- Divide watts by 1,000 to convert to kilowatts (kW), then multiply by your daily hours of use to get daily kWh.
- Multiply kWh by your UK electricity tariff unit rate (for example, 24.5p/kWh on the Ofgem Standard Variable Price Cap, or 7.0p–8.5p/kWh during an Octopus Intelligent Go or Economy 7 overnight off-peak window).
For a complete side-by-side breakdown of the most accurate energy-monitoring plugs tested in our lab, read our Best Energy Monitoring Smart Plugs UK Guide or our 2026 Best Smart Plugs UK Pillar Review.