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Wool Watt

Electric blankets / Roundup

King size electric blankets

Two kings, 90 by 100 inches each. One tells you what it draws and one does not, which on the largest blanket in the house is not a small omission.

By Scooter M.Updated August 31, 2026Scooter M. reads the manuals, compiles the published specs, and shows the arithmetic.

We earn a commission on some links here, at no extra cost to you. It does not change what we recommend or the order the picks appear in. How we are funded.

A large king size bed in a bright white bedroom

The Bedsure king is the pick, because it is the only king-size blanket we found that publishes a wattage: dual 110 W controllers at 120 V. That is about 32 cents a night with both sides running, or 16 cents with one. The Westinghouse king is reversible flannel and sherpa but publishes no figure at all.

The picks, with the numbers

Ranked on what the maker publishes, not on a score we invented. Tap a row for the full write-up, or go straight to the listing. Cost is 8 hours at the rated wattage and $0.1834/kWh.

Heated blanket picks compared by published wattage and computed cost per night
#ProductBest forWattsPer nightPrice
1
Top pickBedsure Electric Blanket, King, Dual ControlThe only king-size blanket we found with a stated wattage. Dual 110 W controllers, 290 GSM flannel over sherpa.
A king that publishes its watts220 W32 centsCheck price
2
Westinghouse Heated Blanket, KingA reversible king with 10 heat levels and a 12-hour timer. Westinghouse publishes a wattage on its queen but not on this one.
Flannel one side, sherpa the otherNot publishedUncomputableCheck price

Sources: wattage from each maker's own published listing, cited on the card below. Cost is our arithmetic at the EIA rate, shown in full on cost to run.

#ad how we are funded - no live price right now

1

A king that publishes its watts

Bedsure Electric Blanket, King, Dual Control

Rated wattage

220 W

8 hours costs

32 cents

Check price

#ad how we are funded - no live price right now

The only king-size blanket we found with a stated wattage. Dual 110 W controllers, 290 GSM flannel over sherpa.

Where the wattage comes fromBedsure states 120V AC at 60Hz with dual 110W controllers. Both sides at full is 220W; one side alone is 110W. Notably that is the same figure Bedsure prints for its queen, so the king is bigger but the controllers are rated the same.

220 W x 8 h = 1.76 kWh, x $0.1834/kWh = $0.32 per night

Size
King, 90" x 100"
Heat settings
6 levels
Auto shut-off
8 hours (6 timer settings)
Controllers
2 (dual control)
Certification
ETL and FCC certified
Warranty
Not stated on the listing
Rated watts
220 W (dual 110 W)
Voltage
120 V AC, 60 Hz
Fabric
290 GSM flannel / 200 GSM sherpa
Preheat
Yes
Model
BS-500B-S

What it does well

  • Publishes a wattage on a king, which nothing else here does
  • 290 GSM flannel is the heaviest face fabric in this roundup
  • Dual control as standard on the king
  • ETL and FCC certified

Where it falls short

  • Only 6 heat levels
  • No warranty term on the listing
  • Same controller rating as the queen, spread over a bigger blanket

Who this is forA king-size bed with two people in it who want the running cost on the table before they buy.

Skip it ifSkip it if you need fine heat control. Six levels on a king is coarse next to Westinghouse's ten or Sunbeam's twelve.

2

Flannel one side, sherpa the other

Westinghouse Heated Blanket, King

Rated wattage

Not published

8 hours costs

Uncomputable

Check price

#ad how we are funded - no live price right now

A reversible king with 10 heat levels and a 12-hour timer. Westinghouse publishes a wattage on its queen but not on this one.

Where the wattage comes fromNo wattage published for this king. The same brand's queen (KTHB-QAVV-Q) does state 100W in its listing copy, which tells you the omission here is a listing decision rather than a company policy.

Size
King, 100" x 90"
Heat settings
10 levels
Auto shut-off
Up to 12 hours
Controllers
1 stated
Certification
ETL and FCC certified
Warranty
Not stated on the listing
Rated watts
Not published
Fabric
Flannel one face, sherpa fleece the other
Timer
12-hour settings
Model
KTHB-QTVS-K

What it does well

  • Reversible: silky flannel one side, sherpa the other
  • 10 heat levels and a 12-hour timer
  • ETL and FCC certified with overheat protection

Where it falls short

  • No published wattage on a blanket this size
  • One controller stated on a king-size blanket
  • No warranty term given

Who this is forSomeone who wants the sherpa face on a king and does not need the running cost computed.

Skip it ifSkip it if you share the bed and disagree on heat. The dual-control Bedsure king also tells you its watts.

How we ranked these

  • Published wattage first, and on a king it matters most: this is the largest heated surface in the house and the one running longest.
  • Dual control second. A king is almost always a shared bed.
  • Then fabric weight, timer range and certification, from the maker's listing.

We have not handled these products and we do not claim to have. The full method, including the rubric weights and what we refuse to claim, is on our methodology page.

The odd thing about king-size wattage

You would expect a king to draw noticeably more than a queen. It is a bigger blanket with more element in it. Bedsure publishes dual 110 W controllers on both, which means the king and the queen carry the same controller rating spread over different areas.

The honest reading is that the controller is rated for a maximum and the element length differs underneath it. What we can say with confidence is what the maker states, which is 110 W per side on both. What we cannot say is how the heat density compares, because that would require measuring a blanket we do not have.

What 220 W costs: a dual-control king with both sides on
Cost of running 220 watts for various durations at $0.1834/kWh
Run timekWhCostWorking
1 hour0.224 cents220 x 1 / 1000 x 0.1834
4 hours (an evening)0.8816 cents220 x 4 / 1000 x 0.1834
8 hours (a night)1.7632 cents220 x 8 / 1000 x 0.1834
30 nights at 8 hours52.80$9.68220 x 240 / 1000 x 0.1834
A 120-night winter at 8 hours211.20$38.73220 x 960 / 1000 x 0.1834

Rate: US Energy Information Administration, Electric Power Monthly, Table 5.3 (June 2026): 18.34 cents per kWh, average US residential. Retrieved 2026-08-31.

Rated wattage is the ceiling, not the average. A thermostatic blanket cycles its element on and off once the bed is warm, so an all-night bill usually lands below the rated-watt figure. We publish the rated number because it is the only one the maker stands behind, and we do not estimate a duty cycle for a blanket we have not measured.

Fabric weight matters more at this size

A king blanket has a lot of surface area losing heat to a cold room, and the fabric is what slows that down. Bedsure publishes 290 GSM flannel over 200 GSM sherpa, the heaviest face fabric of anything we track. Westinghouse publishes flannel one side and sherpa the other without stating weights.

This is a genuinely useful lever on running cost that nobody frames as one. A heavier blanket holds the heat the element produces, so it reaches a comfortable temperature at a lower setting and cycles off sooner. You cannot compute that saving without measuring it, and we have not, so we are not going to put a number on it. But the mechanism is real and it is a reason to prefer the heavier fabric at the same price.

Practical constraints at 90 by 100 inches

  • Two cable runs, two plugs. A dual-control king needs power at both sides of the bed or a long enough run to reach one socket. Measure before you order.
  • Washing it is a real operation. A king blanket is a large wet object and many domestic machines struggle with the volume. The wash rules in washing an electric blanket apply, and the drum capacity question is on you.
  • Storage. Roll it, do not fold it hard. A crease is a stress point in the element and a king has the most surface to crease. See storing a heated blanket.

Questions people actually ask

What size is a king electric blanket?
Both kings here are 90 by 100 inches, which is the standard US king blanket size and gives useful overhang on a 76 by 80 inch king mattress.
How much does a king size electric blanket cost to run?
For the only king that publishes a figure, Bedsure's dual 110 W: about 32 cents for an eight-hour night with both sides on, 16 cents with one. At $0.1834/kWh. The Westinghouse king publishes nothing, so its cost cannot be calculated.
Do king size electric blankets have two controllers?
Usually. Bedsure's king ships dual control as standard. Westinghouse's king states one controller, which is unusual at this size and worth noticing before you buy for a shared bed.

Sources

Every specification on this page traces to a published manufacturer listing or a government data source. Where a maker publishes no wattage, we say so rather than estimating one.