Standby Power Cost Calculator
Estimate the annual cost of always-on standby, sleep, and phantom electrical loads.
Estimate standby power cost
How this calculator works
Standby power is electricity used while a device is not performing its main function. Examples include quick-start televisions, game consoles, printers, speakers, chargers, and network-connected appliances.
Do not disconnect equipment that requires continuous power for safety, security, medical, networking, updates, or essential settings. Measure before deciding which loads are practical to control.
Ten devices averaging 3 watts for 20 hours per day use about 219 kWh per year and cost about $39.42 at $0.18/kWh.
How to get a more accurate estimate
- Measure individual devices with a compatible plug-in meter.
- Group optional entertainment equipment on an accessible switched power strip.
- Leave essential, safety, networking, and scheduled equipment powered as required.
Frequently asked questions
Do phone chargers use power when empty?
Modern chargers may use very little when no phone is attached, but actual standby consumption varies.
Should I unplug every device?
No. Focus on measured, nonessential loads and preserve safety, security, network, and appliance requirements.
What is a phantom load?
It is a common term for electricity consumed when equipment appears off or is waiting in standby.
Results use the values you enter and the formula shown above. Real bills can include taxes, minimum charges, tiers, time-of-use pricing, cycling losses, and other adjustments. Use a recent bill or a plug-in energy meter when accuracy matters.