How to use the Vampire Power Cost Calculator
The Formula
For each device row: annual kWh = (standby W × quantity × 24 h × 365 days) ÷ 1,000. The calculator sums every row, then multiplies total kWh by your $/kWh rate.
Practical Example
Cable boxes and DVRs can draw 15–30 W; TVs and consoles often land at 3–10 W; chargers and adapters at 0.5–3 W. Add a row per device type and quantity, then override watts with a plug meter if you have one.
About Vampire Power Cost Calculator
Phantom load formula
For each device row: annual kWh = (standby W × quantity × 24 h × 365 days) ÷ 1,000. The calculator sums every row, then multiplies total kWh by your $/kWh rate.
Typical standby draws
Cable boxes and DVRs can draw 15–30 W; TVs and consoles often land at 3–10 W; chargers and adapters at 0.5–3 W. Add a row per device type and quantity, then override watts with a plug meter if you have one.
Frequently asked questions
Q: Is vampire power worth fixing? A: One device may be pennies; a dozen adds up. Q: How do I stop it? A: Smart strips, unplugging idle chargers, and disabling quick-start on TVs cut standby without major lifestyle changes.