Phantom Load Cost
Calculator
Results
- Total standby power (W)
- 36
- Annual energy (kWh)
- 315.36
- Annual cost
- 53.6112
- Monthly cost
- 4.4676
Energy results
| Total standby power (W) | 36 |
| Annual energy (kWh) | 315.36 |
| Annual cost | 53.6112 |
| Monthly cost | 4.4676 |
formula-map diagram
- Total standby power (W)
- 36
- Annual energy (kWh)
- 315.36
- Annual cost
- 53.6112
- Monthly cost
- 4.4676
Energy relationship
Formula
kWh/year = W_standby × devices × 24 × 365 ÷ 1000= 36
Note
This is a simplified model: it applies the standard equation to the numbers you entered and ignores real-world losses, weather variation, tariff structures and equipment tolerances. Wind power assumes air density 1.225 kg/m³ at ISA sea level and the power coefficient you enter (Betz limit 0.593). Verify with measured data or a professional energy audit before making purchasing decisions.
More in Energy and environment
See all →Frequently asked questions
What exactly counts as phantom or standby load?+
Phantom load is the electricity a device draws while switched off or in standby mode but still plugged in, common in TVs, game consoles, chargers, and appliances with a remote, clock, or always-on sensor. Even a few watts per device adds up when multiplied across dozens of devices running continuously.
How is the annual cost calculated?+
The calculator multiplies the device's standby wattage by 24 hours a day and 365 days a year to get annual kWh, then multiplies by your electricity rate. A 5-watt phantom load running constantly consumes about 43.8 kWh per year, which at $0.15/kWh costs roughly $6.57 annually for just that one device.
Why does phantom load matter if each device only draws a few watts?+
Because standby load runs 24/7, 365 days a year, even small wattages accumulate into meaningful energy use, and phantom load collectively can account for 5-10% of a typical household's electricity bill. It's often called a 'load' precisely because it's invisible but persistent.
How can I reduce phantom load in practice?+
Unplugging devices when not in use, using a switched power strip to cut power to multiple devices at once, or choosing ENERGY STAR-rated electronics with lower standby draw are the most common ways to cut this cost. Devices with physical off switches that fully disconnect power eliminate phantom load entirely.
Is phantom load the same for every device of the same type?+
No, standby draw varies significantly by model and age, with older electronics and cheaper power supplies often drawing more in standby than newer, more efficient designs. A plug-in power meter measured over a day gives the most accurate reading for any specific device.