Electricity Running Cost Calculator
How much does it cost to keep something switched on? Enter the power rating and how long it runs.
Running cost
Check the label or manual. Actual use varies by model and setting.
e.g. 0.25 = 15 min
0 to 7
Example rate — enter your own tariff.
Estimated cost to run this appliance
£1.00per day used
Uses 4 kWh on each day it's used (500 W × 8 h).
How it works: cost = power (kW) × hours used × price per kWh. Standing charges aren't included because you pay them whether or not the appliance is on.
Estimates only. Real consumption depends on the model, settings and how the appliance is used.
Running cost for devices left on
Things that run for long periods — dehumidifiers, heaters, fish tanks, computers and network equipment — can cost more over a year than powerful appliances used briefly. Entering the hours honestly is the key to a useful estimate.
Comparing options
Try the same task with different devices or settings to see which is cheaper to run on your tariff.