Home & DIY
Appliance electricity cost
Estimate energy and cost from power, usage and your tariff.
A clear answer. Here’s how.
Energy in kWh = watts ÷ 1,000 × hours per day × days. Cost = energy × your tariff. Enter average operating power, not a maximum rating when consumption varies. Standing charges, tiered prices and taxes are excluded.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Average power draw (W)
- 100
- Hours per day
- 6
- Number of days
- 30
- Price per kWh
- 0.25
Example result
- Energy
- 18 kWh
- Usage cost
- 4.5