How Much Does It Cost to Run a Phone Charger?

About a third of a cent per full charge. A phone battery of 12 to 20 Wh takes roughly 20 Wh from the wall once charging losses are included, and 0.02 kWh x $0.173 is about 0.35 cents. A year of daily charges costs about $1.26.

About $1.89 a year on this page's default. 10 W for 3 hours a day is 0.03 kWh, or 10.95 kWh a year, and 10.95 x $0.173 is about $1.89.

About 16 cents a month. 0.03 kWh a day for 30 days is 0.9 kWh, and 0.9 x $0.173 is about $0.16.

Under half a cent. The phone draws full power only until the battery is nearly full, then just enough to stay topped up, so a whole night uses about 20 to 25 Wh, roughly 0.35 to 0.43 cents at the national average rate.

About 5 to 45 W while charging, depending on the adapter. Standard chargers deliver 5 to 20 W and fast chargers 20 to 45 W at the start of a charge, tapering as the battery fills. The 10 W default here is a reasonable average across a charging session.

Barely. Federal rules since 2016 limit the no-load draw of a typical phone adapter to 0.1 W, which is about 0.88 kWh, roughly 15 cents, if left plugged in all year. Very old adapters can draw several times that.

No. A year of daily phone charging uses about 7 to 11 kWh, less than a 1,500 W space heater uses in a single 8 hour day at its thermostat setting (7.2 kWh).

Not meaningfully. The battery needs the same energy either way, and fast charging only loses a few percent more as heat. On a charge that costs about a third of a cent, the difference is a tiny fraction of a cent.

Yes, by about 30 to 50 percent per charge, because energy is lost crossing the gap between pad and phone. For one phone charged daily that is well under $1 a year extra at the national average rate.

About two full charges from a 10,000 mAh power bank, which stores about 37 Wh. A 1,000 Wh power station can charge a phone 40 or more times, since each charge takes roughly 20 Wh.