How many watts does a dryer use? A full-size 240V electric dryer draws 3,000–5,000 watts while the heating element is on, and gets through 2–4 kilowatt-hours per load. A gas dryer draws only 250–400 watts, because the burner does the drying and the electricity only turns the drum. Which of those figures you need depends on whether you are sizing a circuit, an inverter or a battery, and they are not interchangeable.
The three numbers, and which one you need
A clothes dryer is really two appliances sharing a cabinet: a large resistive heating element and a small drum motor. Almost all of the electricity goes to the element, and the element is not on for the whole cycle. That produces three separate wattage figures, and most sizing errors come from reaching for the wrong one.
| Number | Typical value | What it is for |
|---|---|---|
| Peak running watts | 3,000–5,400W | Sizing the circuit and the inverter output |
| Average across a cycle | 2,000–3,500W | Adding a dryer into a whole-house load total |
| Energy per load | 2.0–4.0 kWh | Sizing a battery, and working out cost |
The peak figure is the one implied by the rating plate and by the 30-amp breaker the dryer sits on. It is real, but it describes the worst instant of the cycle rather than the cycle. Multiply it by an hour and you overstate a load of laundry by a third or more.
For anything involving stored energy, use kilowatt-hours per load. It is the only figure that compares honestly across a vented electric dryer, a heat pump dryer and a gas dryer, because it already accounts for how long each one takes.
Why the average is lower than the peak
The heating element does not stay energised for 45 minutes. A thermostat cuts it out once the exhaust air is up to temperature and back in as the air cools, so the element pulses through the cycle while the drum motor and blower run continuously underneath at 250–400W. The last five to ten minutes of most cycles are a cool-down with the heat off entirely.
Net effect: a dryer with a 5,000W peak draw averages closer to 3,000–3,500W over a full cycle. Early in the cycle, with soaking clothes and a cold drum, the element is on almost constantly. By the end it is barely on at all.
What actually moves the energy per load is not the dryer’s wattage but how much water it has to evaporate and how easily the moist air escapes:
- The washer’s spin speed. This is the single biggest lever, and it is in the other machine. A 1,200–1,400 rpm final spin leaves far less water in the load than an 800 rpm spin, and the dryer pays for every gram of it.
- A restricted vent. A long, kinked or lint-clogged duct traps humid air in the drum and stretches the cycle. This is the most common reason an old dryer suddenly seems to cost more.
- Timed drying instead of moisture sensing. A timed cycle keeps heating after the clothes are dry. Over-drying is pure waste and it is hard on fabric.
- Load size and fabric. Towels and denim hold several times the water of shirts, and overstuffing the drum blocks airflow rather than saving a cycle.
- Where the dryer lives. A vented dryer in an unheated garage in winter heats cold makeup air from a lower starting point, and pushes your heated indoor air out through the wall while it does it.
The washer sets the dryer’s bill. If your energy per load looks high, check the spin speed before you blame the dryer. Water removed by the washer’s spin costs almost nothing; water removed by a heating element costs a great deal.
How many watts does a dryer use, by type
Type matters far more than brand here. A gas dryer and a heat pump dryer are doing the same job as a vented electric dryer using a fraction of the electricity, and the annual figures are not close. The per-year column assumes about 280 loads, which is roughly five loads a week and close to the load count US efficiency testing uses.
| Type | Running watts | Per load | Per year |
|---|---|---|---|
| Gas dryer (electricity only) | 250–400W | 0.1–0.2 kWh | 30–60 kWh |
| Heat pump dryer | 500–1,000W | 0.7–1.6 kWh | 150–400 kWh |
| Compact 120V vented, 24-inch | 1,400–1,600W | 1.5–3.0 kWh | 450–800 kWh |
| Compact 120V ventless condenser | 1,200–1,500W | 2.0–3.5 kWh | 550–950 kWh |
| Full-size 240V vented electric | 3,000–5,000W | 2.0–4.0 kWh | 550–1,000 kWh |
| Full-size 240V, pre-2000 or timed-dry only | 4,000–5,600W | 3.5–5.0 kWh | 900–1,400 kWh |
Two lines deserve a second look. The gas dryer asks so little of the outlet because the burner supplies the heat, leaving only the motor, igniter and controls. The heat pump dryer is low because it recycles its own hot air instead of heating fresh air and throwing it outside, which is also why its cycles run 90–140 minutes rather than 45. The ventless condenser is the one that surprises people: no duct needed, but usually the least efficient option per load.
Finding your own dryer’s figure
The rating plate inside the door or on the back gives volts and either watts or amps. Amps times volts gives watts, and our watts to amps calculator runs it the other way if your plate lists watts. That gives you the peak. For energy per load you want the yellow EnergyGuide label, which states estimated annual kilowatt-hours; divide by 280 for a per-load figure.
Startup surge: a dryer barely has one
This is where dryer sizing diverges sharply from fridge sizing, and it is worth being blunt about: a clothes dryer has no meaningful startup surge.
The heating element is a resistive load. It is a coil of wire that gets hot, and it draws essentially its rated current the moment it is switched on. There is no inrush multiple to allow for. The three-to-seven-times spike that dominates refrigerator sizing comes from a compressor motor starting against pressure, and there is nothing equivalent inside a dryer.
The drum motor does surge, briefly, at perhaps three to five times its 250–400W running draw. That is a few hundred watts to around 1,500W for a fraction of a second, and in most control sequences the motor starts before the element energises. Against a 5,000W heating load it does not change the answer.
Do not apply the fridge rule here. Adding a 3× surge allowance to a dryer’s running watts will send you shopping for 15,000W of inverter you do not need. Size a dryer on continuous output. The problem with putting a dryer on a battery is that the continuous number is already enormous and it stays enormous for the better part of an hour.
The 240-volt problem
Before any of the wattage arithmetic matters, there is a question that decides it: what voltage does your dryer want?
A full-size US electric dryer runs on a dedicated 240V circuit, almost always 30 amps, through a four-prong NEMA 14-30 outlet on newer installations or a three-prong 10-30 on older ones. That circuit offers 7,200W of headroom, of which the dryer typically uses 12–21 amps. Portable power stations, by contrast, output 120V through ordinary household sockets.
That is a mismatch of voltage, not of capacity. A 3,000W portable unit will not run a 240V dryer badly; it will not run it at all. Buying a bigger portable unit does not fix it. Split-phase 240V output exists, but it belongs to a different class of product: larger home backup systems, or two matched units paired together, wired in rather than plugged in.
Three dryers do plug into an ordinary 120V outlet: a gas dryer, a compact 24-inch vented electric, and a compact ventless condenser. The compact electric models are capped by their 15-amp circuit at about 1,500W, which is why their cycles run long. The runtime table below assumes one of those three.
How long a power station really runs a dryer
Take the rated capacity, subtract 10% for inverter and conversion losses, then divide by the average draw. The table assumes a gas dryer at 350W and a compact 120V electric dryer averaging 1,300W across its cycle, with nothing else connected. If you are working from a battery rated in amp-hours rather than watt-hours, convert it first with the amp-hours to watt-hours calculator.
| Capacity | Usable at 90% | Gas dryer, 350W | Compact 120V, 1,300W | Full-size 240V |
|---|---|---|---|---|
| 300Wh | ≈270Wh | ≈45 min | ≈12 min | Will not run |
| 500Wh | ≈450Wh | ≈1 hr 15 min | ≈20 min | Will not run |
| 1,000Wh | ≈900Wh | ≈2 hr 30 min | ≈40 min | Will not run |
| 2,000Wh | ≈1,800Wh | ≈5 hours | ≈1 hr 20 min | Will not run |
| 3,600Wh | ≈3,240Wh | ≈9 hours | ≈2 hr 30 min | Will not run |
Read the gas column as loads rather than hours. At 350W an hour-long cycle costs about 0.35 kWh, so a 1,000Wh station sees a gas dryer through two or three full loads with something left over. That is a useful capability during an outage, and it is cheap to provide.
The compact electric column is thinner than it looks, because a compact dryer often needs two hours for a full load: a 2,000Wh unit does not finish one, and a 3,600Wh unit finishes one and is then empty. The last column is not a wattage failure. Even setting the voltage aside, a full-size dryer averaging 3,000W drains a 3,600Wh unit in a little over an hour — one load, from a full battery.
On the numbers. Capacity and output are manufacturer specifications. Expect 80–90% of rated capacity in real use after inverter losses, and less in cold weather.
How to measure your own dryer
Every figure above is a range. Your dryer, with your laundry habits, is knowable — but how you measure it depends on the voltage.
For a 120V dryer, gas or compact electric, use a plug-in energy monitor: the type that sits between the plug and the socket and totals kilowatt-hours. Reset it, run three or four typical loads, then divide. Several loads beat one, because composition varies more than anything else.
For a 240V dryer, a plug-in monitor will not fit the outlet and is not rated for it. Three options, in order of how much trouble they are:
- Read the utility meter immediately before and after a load, with as little else running as you can manage. Crude, free, and accurate enough at 2–4 kWh per load.
- Use the EnergyGuide label or the manufacturer’s published annual kWh figure and divide by 280 loads. Less personal, but it reflects a standard test.
- Fit a whole-home energy monitor with current clamps on the dryer’s breaker. That gives a permanent per-circuit reading, but it means working inside a live service panel — an electrician’s job unless you are qualified.
Once you have kilowatt-hours per load, multiply by loads per week and by 52 for the annual figure. The watts to kWh calculator handles the conversion if all you have is a wattage and a run time.
Should a dryer be on battery backup?
For a full-size electric dryer, no. Not on a portable power station, and in most cases not on a home battery either.
The arithmetic settles it. One load of laundry costs 2–4 kWh. A refrigerator uses 1–2 kWh across a whole day. So drying one load spends roughly two days of refrigeration, and refrigeration is the load that actually protects something. Laundry is the most deferrable job in the house: a drying rack costs almost nothing, works during an outage, and needs no inverter.
If you are specifying a whole-home system with a critical-loads panel, leave the dryer circuit out of it. Backing up a 30-amp 240V circuit forces the whole system up a size bracket to serve a load you will use once a week at most. The same logic applies to the range and the electric water heater, and it is the core of how to think about a whole-house load list. Our home battery backup guide works through which circuits earn their place.
One exception is worth naming: a gas dryer at 250–400W is a trivial load and can sit on a backup circuit without distorting the design. For a van, an RV or an off-grid cabin the answer is simply no, because nothing in that class of system supports a resistive heating load of this size for this long. To size for the loads that do matter, the power station finder filters by continuous output and capacity.
What a dryer costs to run per year
At a US average residential rate of roughly 17 cents per kilowatt-hour, and about 280 loads a year:
- Heat pump dryer at 250 kWh: about $43 per year
- Compact 120V electric at 600 kWh: about $102 per year
- Full-size vented electric at 700 kWh: about $119 per year
- Pre-2000 full-size electric at 1,100 kWh: about $187 per year
- Gas dryer: roughly $7 of electricity, plus about 40–70 therms of gas, which is another $60–105 at a residential rate near $1.50 per therm
Per load, a full-size electric dryer at 3 kWh costs about 51 cents. That is the figure to hold in your head, because it makes the trade-off concrete: two loads a week air-dried through the summer is about $50 a year.
Rates vary enormously by state, so substitute your own; at 30 cents per kWh every figure above nearly doubles and a heat pump dryer looks very different. Take the free levers first, though: spin faster, clean the lint filter every load, check the vent run once a year, use the moisture sensor rather than a timer, and run loads back to back while the drum is still hot. The vent check is the one most people skip, and it is often the largest single gain.
Frequently asked questions
How many watts does a dryer use?
A full-size 240V electric dryer uses 3,000–5,000 watts while the heating element is on and averages 2,000–3,500 watts across a cycle, which works out to 2–4 kilowatt-hours per load. A gas dryer uses only 250–400 watts of electricity, and a heat pump dryer 500–1,000 watts.
Will a 2,000W power station run a dryer?
Not a full-size electric dryer, because that dryer needs 240V and a portable station outputs 120V. It is a voltage mismatch, not a wattage one. A 2,000W unit will comfortably run a gas dryer at 250–400W, and a compact 120V electric dryer at up to about 1,500W, though only for as long as its capacity lasts.
How many amps does a dryer use?
A full-size electric dryer draws 12–21 amps at 240V, which is why it sits on a 30-amp breaker. A compact 120V electric dryer draws about 12–13 amps on a 15-amp circuit, and a gas dryer around 3 amps. Divide watts by volts to get amps.
How much does it cost to run a dryer per load?
About 34 to 68 cents per load for a full-size electric dryer at 17 cents per kilowatt-hour, with 51 cents a fair typical figure. A heat pump dryer costs roughly 12–27 cents per load. A gas dryer costs a few cents of electricity plus the gas, which usually lands between those two.
Do gas dryers use electricity?
Yes, but very little. The gas burner supplies the heat; the electricity turns the drum, drives the blower and runs the igniter and controls, which comes to 250–400 watts. A gas dryer plugs into an ordinary 120V outlet, and it is the only kind of dryer that is realistic to put on battery backup.
Are heat pump dryers actually cheaper to run?
Yes, by a wide margin on electricity: 150–400 kWh a year against 550–1,000 kWh for a vented electric dryer. The trade-offs are a higher purchase price and cycles of 90–140 minutes rather than 45. Whether the saving pays back depends on your rate and how much laundry you do, so run your own numbers before assuming it does.
Can I run a dryer on solar?
Only in the sense that you can charge a battery from panels and then run a 120V dryer from it. One 3 kWh load needs roughly a full day’s output from 700W of panels at four to five peak sun hours, so a single load consumes an entire day of harvest. A gas or heat pump dryer changes that arithmetic; a clothesline removes it.
Next step. A dryer is a load to design around, not a load to back up. Add up the loads that do matter, then turn the total into a capacity and an output figure with our power station sizing guide.