WattCosts

UK electricity cost calculator

Find what an appliance costs to run per hour, day or year at today's Ofgem price cap of 26.32p per kWh. Pick an appliance or type its wattage, then set your hours or your own tariff.

52.6pan hour
Uses 2.00 kWh a day at 26.32p per kWh.
Per day52.6p
Per week£3.68
Per month£15.97
Per year£191.61

The price cap figure is the Oct–Dec 2026 average for Direct Debit customers in England, Scotland and Wales. Find your own rate on your bill or in your supplier's app.

One hour of each, at the current cap

Cost of running each appliance for one hour at 26.32p per kWh, using typical power ratings.
  1. Electric blanketdouble underblanket, 70W
    1.84p
  2. Dehumidifiercompressor, 157W
    4.13p
  3. Heated clothes airer3-tier, 300W
    7.9p
  4. Oil-filled radiatoron 1.5kW setting
    39.5p
  5. Fan heater2kW
    52.6p

A heater with a thermostat switches on and off, so over an evening it usually costs less than its full-power hourly figure. Each appliance page explains this for that appliance.

Appliances

How the sums work

Every figure on this site comes from one calculation: power in watts, divided by 1,000, times the hours you use it, times your price per kWh. A 2,000W heater running for one hour at 26.32p per kWh uses 2 kWh and costs 52.6p.

We use the Ofgem price cap because most UK households on a standard tariff pay close to it. If you are on a fixed or EV tariff, put your own rate into any calculator. Read how we calculate for the sources behind each number.

Next price change

Ofgem will announce the cap for 1 January to 31 March 2027 on or before 25 November 2026. We update every page on this site the same day.