Vampire Power Draw Calculator: Find Out How Much Standby Power Costs You
Calculate how much electricity your devices consume in standby mode (vampire power) and the annual cost to your electricity bill. Find which devices are the biggest energy vampires.
How Vampire Power Costs Are Calculated
Vampire power (also called standby power or phantom load) is electricity consumed by devices when they're turned off or in standby mode.
Average standby power by device type: TV ($3–$12/year) | Cable box ($25–$35/year) | Game console ($80–$130/year) | Phone charger ($1–$2/year) | Microwave clock ($5–$8/year).
How to Use the Vampire Power Calculator
Add each device
Enter device name and its standby wattage. Check your device's manual or use a plug-in watt meter (Kill-A-Watt) for accuracy.
Set your electricity rate
Find your rate on your electricity bill (US average: $0.16/kWh in 2026).
Click Calculate
See total vampire power draw, annual kWh consumed, and annual cost per device.
Real-World Scenario Example
"A household with a cable box (17W), gaming console (1W idle), 2 TVs (0.5W each), and desktop PC (2W idle) draws ~21W continuously = 184 kWh/year = ~$29/year at $0.16/kWh."
Inputs
Result
~$29/year in vampire power costs
Important Disclaimer
Electricity cost estimates are based on user-entered wattage and electricity rates. Actual standby consumption varies by device model, age, and settings. Use a plug-in power meter (like Kill-A-Watt) for precise measurements.
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