Electric Blanket Running Cost Calculator

This calculator works out how much it costs to run an electric blanket based on its wattage, your electricity rate, and how long you use it each night. Enter the blanket’s power draw (usually printed on the label or in the manual), your cost per kilowatt-hour, and your nightly usage, and you’ll get the cost per night, per month, and per heating season. The first result is the cost for one night, followed by monthly and seasonal totals.

Formula

The cost of running any electrical appliance is calculated by converting its power draw from watts to kilowatts, multiplying by the hours of use, and then multiplying by your electricity rate.

Cost = (Wattage ÷ 1000) × Hours Used × Electricity Rate

• Wattage (W) – the blanket’s power consumption, typically 60–200 W for a double/queen size.
• Hours Used (h) – how long the blanket is switched on, usually 6–10 hours overnight.
• Electricity Rate (cents/kWh) – what your utility charges per kilowatt-hour; find it on your bill.
• Cost – the result in dollars (or your currency) for the given period.

Worked Example

Using the defaults from the calculator: a 100 W blanket, a 15¢/kWh electricity rate, used 8 hours per night, 30 nights per month, for a 4-month season.

1. Convert watts to kilowatts: 100 W ÷ 1000 = 0.1 kW
2. Energy per night: 0.1 kW × 8 h = 0.8 kWh
3. Cost per night: 0.8 kWh × $0.15 = $0.12
4. Cost per month: $0.12 × 30 = $3.60
5. Cost per season: $3.60 × 4 = $14.40

So the default settings give a nightly cost of $0.12, a monthly cost of $3.60, and a seasonal cost of $14.40.

Why Electric Blankets Use So Little Power

Most people overestimate how much electricity an electric blanket draws. Unlike a space heater (1,500 W) or even a hair dryer (1,200 W), a typical electric blanket uses only 60–200 W. That’s because it doesn’t heat the whole room – it only warms the area directly under your body, and it cycles on and off to maintain temperature. A 100 W blanket running for 8 hours consumes 0.8 kWh, which is less than a single load of laundry in a standard electric dryer (about 2.5–4 kWh).

To put it in perspective, running a 100 W blanket every night for a month uses about 24 kWh. The average US household uses around 900 kWh per month, so the blanket adds roughly 2–3% to your usage. In dollar terms, at the national average rate of about 16¢/kWh, that’s about $3.80 per month.

How to Find Your Blanket’s Wattage

The wattage is usually printed on a sewn-in label near the control or on the control unit itself. It may also be listed in the user manual. If you can’t find it, you can estimate:

• Twin size: 60–80 W
• Full/Double: 80–120 W
• Queen: 100–150 W
• King: 120–200 W

Some modern blankets have dual controls, where each side has its own wattage – check the label for the total. If you use only one side, you can halve the wattage for your calculation.

Factors That Change the Cost

Your actual cost depends on more than just the wattage and time:

• Thermostat setting – higher settings draw more power continuously; lower settings cycle on and off, reducing average consumption.
• Ambient room temperature – in a colder room, the blanket runs longer to maintain the set temperature.
• Blanket age and condition – older blankets may have degraded heating elements, drawing slightly more or less power.
• Electricity rate structure – time-of-use plans may charge more during peak hours (evenings), which is when you’d use the blanket.
• Preheating vs. all-night use – using the blanket for 30 minutes to warm the bed and then turning it off costs far less than running it all night.

Electric Blanket vs. Space Heater: Cost Comparison

A common alternative is to heat the bedroom with a space heater. A typical 1,500 W space heater running for 8 hours uses 12 kWh – that’s 15 times more energy than a 100 W blanket. At 15¢/kWh, the space heater costs $1.80 per night versus $0.12 for the blanket. Over a 4-month season, that’s $216 vs. $14.40.

Even a low-wattage ceramic heater (500 W) costs five times more per night than a 100 W blanket. The blanket is one of the most energy-efficient ways to stay warm while sleeping because it heats you directly rather than the entire room.

How to Read Your Electricity Bill for the Rate

Your electricity rate is usually shown as “cents per kWhâ€� on your bill. It may be a single flat rate, or it may vary by time of day (time-of-use). If you’re on a tiered plan, the rate can change after you use a certain amount of energy – use the rate that applies to your typical usage. If your bill only shows a total dollar amount and total kWh, divide the total by the kWh to get the average rate. For example, a $120 bill for 800 kWh gives an average rate of 15¢/kWh.

Don’t forget to include taxes and fees if you want a more accurate cost – they can add 10–20% to the base rate. But for a quick estimate, the base rate is fine.

Common Mistakes in Calculating

• Using watts instead of kilowatts – always divide by 1000 first.
• Forgetting to convert cents to dollars – if your rate is 15¢, use $0.15 in the formula.
• Assuming the blanket draws max wattage all the time – thermostats cycle, so actual consumption is often lower.
• Ignoring dual controls – if you only heat one side, use half the wattage.
• Mixing up months and days – a season is typically 3–5 months, not 30 days.

Safety and Efficiency Tips

Electric blankets are safe when used correctly, but they do draw power and generate heat. To save money and stay safe:

• Use the blanket to preheat the bed, then turn it off before sleeping – this can cut costs by 50–75%.
• Set the thermostat to a lower number – you’ll still stay warm with less energy.
• Don’t fold or bunch the blanket – this can damage wires and cause hot spots.
• Follow the manufacturer’s instructions – some blankets are not meant to be used all night.
• Replace blankets older than 10 years – modern ones have better thermostats and safety features.

Frequently Asked Questions

How much does it cost to run an electric blanket for 8 hours?

At the US average rate of 16¢/kWh, a 100 W blanket running for 8 hours costs about 13¢ (0.1 kW × 8 h × $0.16). A 150 W blanket would cost about 19¢, and a 200 W blanket about 26¢.

Is it cheaper to use an electric blanket or turn up the thermostat?

Usually the blanket is much cheaper. Turning up the thermostat heats the whole house, while the blanket only heats you. A 100 W blanket costs about $0.13 per night, whereas raising the thermostat by 5°F for 8 hours could cost $1–3 depending on your home’s size and insulation.

Do electric blankets use a lot of electricity?

No – they are among the lowest-consumption heating devices. A typical blanket uses 60–200 W, which is less than a light bulb with a heater. Over a month, it might add $3–5 to your bill.

Can I use an electric blanket all night?

Many modern blankets are designed for all-night use and have auto-shutoff features. Always check the label – if it says “preheat only,â€� do not leave it on while sleeping. For safety, follow the manufacturer’s guidance.

How do I find the wattage if the label is worn off?

Check the manual or the manufacturer’s website using the model number. If you can’t find it, use the size-based estimate above. You can also measure it with a plug-in watt meter, which costs about $20 and gives the exact draw.

Does the cost change if I use a timer or auto-off?

Yes – if the blanket turns off after 2 hours instead of running 8, your cost drops by 75%. Using a timer or the blanket’s built-in shutoff can significantly reduce your nightly expense.

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in watts | Blanket wattage | W | 100 | 0
in rate | Electricity rate | cents/kWh | 15 | 0
in hours | Hours per night | h | 8 | 0
in days | Nights per month | days | 30 | 0
in season | Season length | months | 4 | 0
out nightly | Cost per night | $ | (watts / 1000) * (rate / 100) * hours | 2
out monthly | Cost per month | $ | nightly * days | 2
out seasonal | Cost per season | $ | monthly * season | 2