What this calculator does
Electricity running cost works out what an appliance costs to run over time. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulakWh = watts × hours / 1000; Cost = kWh × price per kWh
The inputs explained
| Field | What to enter |
|---|---|
| Power draw (W) | A number, measured in W. Starts at 1200. |
| Hours used per day | A number. Starts at 3. |
| Price per kWh ($) | A number, measured in your currency. Starts at 0.32. |
| Days per year used | A number. Starts at 365. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with power draw
Every other input is held at the calculator’s starting values while power draw varies. Select any row to load that scenario into the calculator.