The Verification Venue · pointed at a thing everyone gets wrong
The Vampire Is Real. It Just Isn't Your Charger.
A phone charger left in the wall with nothing plugged into it draws about 0.26 watts. That is roughly 30 to 50 cents a year. Unplugging it saves pennies. The fear is not made up, though: standby power really does drain a home of about $165 a year. It just hides in a different socket, the one behind the TV.
The charger (the myth)
$0.39 / yr
0.26 W, metered by LBNL. Leaving it plugged in costs pennies. The specific claim that a phone charger "runs up your bill" is false.
The cable box (the real one)
$32.76 / yr
22 W around the clock, on and "off" nearly identical. That is about 85x the charger. This is where vampire power actually lives.
"Unplug your chargers to save money" is one of the stickiest energy tips on the internet, and it is built on a real category (standby power, the electricity devices sip while switched off) welded to the wrong example. A bare charger is an unloaded power supply: no phone to feed, so it idles at a whisper. The money is drawn by devices that are secretly computers and never truly sleep. Build your own home below and watch every dollar recompute from just two numbers you can edit: the standby watts of each device, and your electricity rate.
Your home's idle load, live
Each row is on all year (8,760 hours). Edit any watt figure or your rate; every dollar recomputes as watts x 8.76 x rate. Hit unplug to pull a device and watch the total drop by exactly its cost.
Idle load
– W
summed standby watts, devices in use
Costs you / year
–
at your current rate
Of that, all chargers
–
bare phone chargers only
Drag your eye down the bars. The cable box is a slab. The phone charger is a sliver you can barely see. That gap is the whole story: unplugging every charger in the house buys back well under a dollar a year, while unplugging the one cable box buys back about thirty.
The fear is real. It is aimed at the wrong socket.
Vampire power is a real, large thing. The charger is just not it.
Do not walk away thinking "standby power is a myth, unplugging is pointless." The opposite is true at the whole-home scale. The US Department of Energy puts standby and idle load at 5 to 10% of a home's electricity, about $100 to $200 a year. The NRDC's Home Idle Load study (2015) metered 70,000 California homes and audited a sample on-site: the average home draws 164 watts continuously while nobody is using anything, about $165 a year and roughly 23% of that home's electricity. The category is real money.
Almost none of it is the phone charger. It hides in the always-on computers: a cable box or DVR at 20 to 25 W (its "off" state costs nearly the same as "on", about $30 a year each per NRDC), a game console left in instant-on mode at 12.5 W, a desktop asleep, smart speakers, the Wi-Fi router, and yes, those wireless charging pads. The seam is the mechanism:
A bare charger = an unloaded switch-mode supply
Nothing is plugged into it, so it has no load to feed. It keeps only a tiny control circuit alive, waiting for a phone. That is why it idles at ~0.26 W: a whisper.
A DVR or console = a full computer that never sleeps
It keeps a tuner, a network stack, and firmware live so it can record a show or wake instantly. "Off" is a costume. At 22 W it is roughly 85 bare chargers running at once.
Same word, "vampire power", two very different animals. Name which device you mean and the verdict flips: the charger is theatre, the media shelf is the money.
The honest edge: not every "charger" is a whisper
The pennies verdict is strict, and it is about the bare wired phone charger. Two things you also call chargers break the rule by an order of magnitude, and burying that would be dishonest:
- A laptop brick idles far higher, about 4.4 W on the same LBNL table (roughly $6.50 a year), because it holds a bigger converter awake.
- A wireless charging pad draws 1 to 3 W continuously just sitting there, an order of magnitude more than a bare wired charger, because its coil driver is always listening for a phone.
Both are in the ledger above. Edit their watts and you will see them dwarf the wired charger's sliver. And two more honest notes that are not the money question: some people unplug for fire safety or device longevity, which are real reasons on a separate axis, not the cost axis; and unplugging the cable box means losing your recordings and instant channel access, so that $30 is not a free win, it is a trade.
| device (standby) | watts | kWh / yr | $ / yr | x charger |
|---|
Costs shown at your current rate ($0.17/kWh). The "x charger" column is the watt ratio to a bare phone charger, the number the myth never lets you see.
The check: every dollar recomputed in front of you
Nothing here is a stored dollar figure. The one formula, computed two ways so they must agree:
The offline gate recomputes all of this and the anchor figures two independent ways: node research/should-you-unplug-chargers-to-save-money/verify-should-you-unplug-chargers-to-save-money.mjs. Free choices & uncertainty: the standby watts are metered anchors but vary by model (chargers 0.1 to 0.5 W, DVRs 15 to 30 W); the $/kWh rate is yours to set and swings about 2x by US region; the NRDC 164 W / $165 / 23% figures are California-metered and CA-weighted, so national numbers differ, and $165 uses an implied rate near $0.115/kWh, not the page default. The DOE $100 to $200 and NRDC $165 are whole-home idle load across 60+ devices: never the charger, and never reachable by unplugging chargers.
What's exactly true here, and what's a model
Exactly true (the arithmetic). A watt drawn continuously for a year is 1 W x 8,760 h = 8.76 kWh, and cost is kWh x $/kWh. So a 0.26 W charger is 2.28 kWh, about $0.39 at $0.17/kWh (range $0.30 to $0.52 across typical US rates). A 22 W cable box is 192.7 kWh, about $32.76 at the same rate. The ratio 22 / 0.26 = 84.6, "about 85 chargers", is exact from the watt figures.
Metered anchors (not our invention). Bare cell-phone charger no-load 0.26 W and laptop charger no-load 4.42 W are from the LBNL Standby Power summary table. Xbox One instant-on 12.5 W, cable/DVR up to about $30/yr, and the 164 W / $165 / ~23% whole-home average are from NRDC's Home Idle Load (2015). HowToGeek's independent 2015 Kill-A-Watt test could not get a single bare charger to register at all and had to gang ten-plus together to read about 2 W, putting five chargers near $0.37/year: independent confirmation of "pennies".
Chosen for the demo (edit them). The starting home (quantities and which devices) is a plausible sample, not a census; it accounts for only part of a real 60+ device home, which is why its total sits below the NRDC 164 W benchmark. Wireless pad 2 W, TV standby ~1 W, desktop sleep ~3 W, smart speaker ~2 W, router ~6 W are mid-range typical values, every one editable. The router is "always on active", not strictly standby, but it is part of idle load, so it is included and labelled.
Not the cost question (kept separate on purpose). Fire safety and battery/device longevity are legitimate reasons some people unplug, on a different axis from money; the DVR trade (lose recordings and instant channels) is named rather than pretended away. The verdict here is only about dollars.