You don't have to take anyone's word for what a heated blanket costs to run. It's one line of arithmetic, and every number in it is printed somewhere you can check — one on the product's rating label, one on your electric bill. This article gives you the formula, the honest category numbers, and a few worked examples. After that, no paragraph on any store's website — including ours — should be able to tell you something you can't verify yourself.
The formula for heated blanket electricity cost
Run the math yourself: watts ÷ 1,000 × hours × your rate per kWh.
Three inputs, none of them secret:
- Watts. The power draw, printed on the product's rating label — usually on the controller or near the plug. Not the marketing page. The label.
- Hours. How long it actually runs in an evening. Be honest; four hours is a long evening on the couch.
- Your rate. Dollars per kilowatt-hour, on your electric bill. The US residential average is roughly $0.17 per kWh, per the EIA. Check your own bill anyway — New England and California commonly run well above that number, and one line on your statement settles it.
Divide watts by 1,000 to get kilowatts. Multiply by hours to get kilowatt-hours. Multiply by your rate to get dollars. That's the whole calculation. No store, ours included, gets to argue with it.
How many watts does a heated blanket use?
Heated blankets and heated robes typically draw somewhere around 60 to 200 watts, depending on the model and the heat level you pick. The number on the rating label is the maximum — what the thing pulls with everything turned up. At a middle setting it pulls less, because you're asking the heating element for less.
For comparison, a typical portable space heater draws about 1,500 watts. Keep both numbers in your head. Everything below follows from them.
What does a heated blanket cost per night? Worked examples
Assume a four-hour evening — dinner to bedtime — and the US average rate of $0.17 per kWh. Swap in your own rate; the shape of the answer won't change.
| What's running | Draw | 4-hour evening | 30 evenings |
|---|---|---|---|
| Heated blanket, low setting | ~60W | ~$0.04 | ~$1.22 |
| Heated blanket, middle setting | ~100W | ~$0.07 | ~$2.04 |
| Heated blanket, maximum | ~200W | ~$0.14 | ~$4.08 |
| Portable space heater | ~1,500W | ~$1.02 | ~$30.60 |
| Whole-home thermostat, a few degrees up | your furnace | dollars, not cents | the big line on your bill |
Stretch it across a heating season. Run a heated robe at a middle setting every evening from October through March — call it 180 evenings — and you've spent something like $12 on electricity for the whole winter. A space heater on the same schedule costs about $184. Same rate, same hours, roughly fifteen times the money, and you can rerun every one of those figures on the back of an envelope.
Heated blanket vs space heater cost: is that comparison fair?
Only partly. A space heater is attempting a bigger job — warming all the air in a room, including the air near the ceiling and the air leaking out under the door. A blanket puts heat directly on a person. Different jobs, so the raw cost gap flatters the blanket a little.
But look at what problem you're actually solving. If it's "one person is cold on the couch while everyone else is fine," then heating an entire room is the wrong-sized tool. You pay to warm all the air in the space so that the thin layer touching one body gets warmer. Denvale heats the person, not the house. That's the entire idea of the product, and it's why the cost gap exists.
One footnote on the math: it assumes the device turns off. The Denvale robe shuts itself off after four hours, every session, whether you remember it or not. So the four-hour column above isn't an optimistic scenario — it's the ceiling for a single session.
The real saving isn't the blanket's own draw
Here's the part most ads skip, so we'll say it plainly: a heated blanket doesn't heat rooms. Its own draw being cheap is not where the money is — cents were never your problem. The saving is what it lets you do to the thermostat.
Whole-home heat is the expensive line on a winter bill, and a lot of it goes to rooms nobody is sitting in. If a heated robe makes 67°F genuinely comfortable where 71°F used to be the floor, you stop paying to bring every empty room up to couch temperature. How much that's worth depends on your furnace, your insulation, and your square footage — we're not going to invent a percentage for you — but it's measured in dollars, and the robe's own draw is measured in cents. That trade is the actual argument for heating the person instead of the house.
One caution before you race the thermostat downward. The National Institute on Aging recommends keeping indoor temperatures at roughly 68 to 70°F or higher for older adults, and notes that many people keep their homes colder to save money. A heated robe is a way to be comfortable at a sane indoor temperature. It is not a license to keep an older person's house cold and hand them a robe instead. Warm the person, and keep the house safe too.
What is the Denvale robe's wattage?
It's printed on the rating label, and we'll publish our own measured figure once we've put a watt meter on our own unit — a real meter, a real robe, at each of the six levels. We're not going to type a flattering number into a webpage first and measure it later. Don't trust the paragraph. Check the checkables.
Until that figure is up, use the category range in your math: 60 to 200 watts. At $0.17 per kWh, even the worst case — 200 watts, four hours, every single evening — is about 14 cents a night. Wherever on that range the label lands, the answer stays "cents."
What we can already tell you is how the robe spends those watts. Six heat levels, covering approximate surface temperatures of 82 to 115°F; most people settle between levels 3 and 5. The heat sits where a sitting body actually loses it: a front panel, a back panel, and a heated foot pocket. The sleeves are unheated on purpose, so your hands stay free and the fabric stays light. It runs on a standard 120V US outlet — nothing to install. If you're weighing this format against a flat electric blanket, the wearable vs electric blanket comparison covers the differences that aren't about electricity.
When a heated blanket is the wrong answer
The math above only matters if a heated robe fits your actual problem. Sometimes it doesn't.
- If everyone in the house is cold, your problem is the house. A robe warms one person and does nothing for the other four. Look at drafts, insulation, and the furnace before you look at us.
- If you need a warm room — a workshop, a home office where your hands are out in the air all day — a robe on your back doesn't warm the air your fingers are in. A space heater costs more to run, but it's doing the job you actually need.
- If your evenings are all motion — cooking, laundry, chasing kids — a robe with a wall plug keeps you within a cord's length of an outlet. It's built for sitting still, not laps of the house.
- If it's for an infant, or for anyone who can't feel heat or can't take the robe off by themselves, the answer is no, at any price. Pacemaker wearers should ask their doctor first.
But if the actual situation is one specific person who's cold when everyone else is fine, the arithmetic is now yours: warming that one person costs cents an evening, and it may let the number on the thermostat — the expensive number — drift down for everyone.
Check our math with your own bill
The Denvale heated robe is $59.95 at launch, through December 31 — $119.95 after that — with free US shipping and 30 nights from delivery to decide, used and washed included. Its wattage is on the rating label, and the formula at the top of this page works on it exactly as it works on everything else. If either the math or the robe doesn't hold up in your living room, send it back and being wrong cost you nothing. The rest of the details are on the product page.