Standby Power Calculator
Calculate the annual cost of phantom or standby power drawn by devices when plugged in but not in active use.
watts
USD/kWh
Annual Standby Cost
98.55 USD
Monthly Cost8.21 USD
Annual Standby Energy657.0 kWh
Total Standby Load75.0 watts
Annual Standby Cost vs Electricity Rate
How to Calculate Standby Power Cost
Standby power (phantom load) is electricity consumed by devices when they are turned off but still plugged in.
Formula
Annual kWh = Devices * Avg Standby Watts * 8,760 hours / 1,000
Annual Cost = Annual kWh * Rate
Common Standby Draws
Example Calculation
15 devices averaging 5W standby power at $0.15/kWh.
- 01Total standby: 15 * 5 = 75 watts
- 02Annual kWh: 75 * 8,760 / 1,000 = 657 kWh
- 03Annual cost: 657 * $0.15 = $98.55
- 04Monthly cost: $98.55 / 12 = $8.21