Home Energy Cost and Standby Power Calculator
Adds up what appliances cost you each year at your tariff.
Cost per year
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Energy per year — kWh
Of which standby —
By appliance
The formula
kWh = watts × hours × running share × 365 ÷ 1,000 standby = standby watts × hours off × 365 ÷ 1,000
Rated power is the maximum, so thermostatic appliances use less than it suggests. That is what the running share allows for.
What to watch out for
A plug-in energy meter gives a truer figure than any rating plate. For a single appliance, use the electricity cost calculator.
Frequently Asked Questions
How much does standby power cost?
1 W left on all year uses 8.76 kWh. At 0.25 per kWh that is 2.19 a year per watt.