How Many Watts and Amps Does a Dryer Use?

How many watts does a dryer use? A full-size 240V electric dryer draws 5,000–5,500 watts, about 21–23 amps, while the heating element is on, and gets through 2–4 kilowatt-hours per load. A gas dryer draws only 250–400 watts, about 2–3.5 amps at 120V, 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.

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 energized 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.

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.

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 (the amps to watts calculator does it for you), 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.

How many amps does a dryer use?

Amps are watts divided by volts, so a dryer’s current depends on its supply voltage as much as on its wattage. A full-size electric dryer’s heating element is rated 5,000–5,500W on most models. At 240V that is 5,000 / 240 = 20.8A to 5,500 / 240 = 22.9A, so the dryer draws about 21–23 amps whenever the element is on. Averaged across a cycle, as the thermostat switches the element on and off, the same dryer draws about 8–15A (2,000–3,500W). The first figure is what the circuit, or an inverter, has to carry; the second is the one for a whole-house energy estimate.

A gas dryer runs its drum motor, blower and controls from an ordinary 120V outlet, and makers’ installation instructions call for a 15- or 20-amp circuit. Each time the burner lights, the glow-bar igniter adds about 3–4A for roughly 10–30 seconds, which is where the gas dryer’s peak comes from. A compact 24-inch electric dryer on 120V draws about 10–13A (1,200–1,600W).

Heat pump dryers split by model, so check the voltage before assuming one plugs into a standard outlet. Miele’s TXB360WP spec sheet lists 120V, a 15A fuse rating and a total rated load of 1.00 kW, about 8A. Bosch’s WQB245B0UC spec sheet lists 900W and 4A on 208–240V, with a NEMA 6-15 plug.

The 80% continuous-load rule often quoted for dryers is not why the breaker is 30 amps. The National Electrical Code treats a load as continuous only when its maximum current lasts three hours or more, and a dryer cycle does not. The dryer gets an individual 30A, 240V circuit because its maker’s installation instructions call for one, and the code’s load calculation counts each household dryer at 5,000W or its nameplate rating, whichever is larger (NEC 220.54, in NFPA 70). A dryer drawing 21–23A sits within that 30A rating. Rules vary with the code edition your state or town has adopted, and dryer-circuit wiring is a job for a licensed electrician.

Running versus starting amps. For an electric dryer they are effectively the same number. The element reaches its full 21–23A the moment it switches on, and the drum motor’s brief start usually comes before the element does, so the circuit sees the element-on running current, not a multiple of it; the startup surge section explains why. The short peaks worth planning for on a power station are a gas dryer’s igniter, shown in the table, and a heat pump dryer’s compressor start.

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 five-to-seven-times current spike that dominates refrigerator sizing comes from a compressor motor starting against pressure, and there is nothing equivalent inside a vented electric or gas dryer. A heat pump dryer is the exception: it has a compressor, so leave some headroom above its running watts for the compressor to start.

The drum motor does surge, briefly, at perhaps three to five times its 250–400W running draw. That is roughly 750–2,000W for a fraction of a second, and in most control sequences the motor starts before the element energizes. Against a 5,000W heating load it does not change the answer.

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 (two hots, a neutral and a separate ground) or, in many homes wired before the 1996 National Electrical Code required four-wire dryer circuits in new work, a three-prong NEMA 10-30 (two hots and a neutral, with no separate ground). That circuit is rated for 7,200W, and the dryer draws 21–23 amps of its 30 while the element is on. Most portable power stations, by contrast, output 120V only, through ordinary household sockets; a few large units add a 240V split-phase output.

That is a mismatch of voltage, not of capacity. A 3,000W unit with only 120V outlets will not run a 240V dryer badly; it will not run it at all, and buying a bigger 120V-only unit does not fix it. Split-phase 240V output does exist on a few large portable units, such as the Jackery Explorer 5000 Plus (listed at 7,200W) and the PECRON F5000LFP (listed as 120V/240V), and on larger home backup systems; on those the voltage is not the obstacle. Check a unit’s 240V outlet type against your dryer’s plug, and its continuous output against the dryer’s draw, before assuming it will work.

Several dryers do plug into an ordinary 120V outlet: a gas dryer, a compact 24-inch vented electric, a compact ventless condenser, and the heat pump models built for 120V. 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 covers the gas and compact electric types.

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. Capacity is only half the test: the station’s continuous AC output must cover the dryer’s rated watts, about 1,500–1,600W for a compact electric dryer (1,800W leaves a margin), and start the drum motor too. Units around 300–500Wh rarely list that much output, and many 300Wh units list only about 300W, too little for a gas dryer’s running draw plus the drum motor’s start, so those cells read “Inverter too small”. The gas column also assumes the inverter can start the drum motor and carry the igniter, which brings the dryer to about 600–900W for the 10–30 seconds it glows each time the burner lights, so check a 500Wh unit’s continuous and surge output before relying on that row. 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.

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.

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:

1. 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.
2. 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.
3. 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 almost 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 $9–19 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 a 13-week summer saves about $13, or about $53 if you air-dry them all 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