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A typical 1,500-watt toaster oven uses about 0.5 kWh per 20-minute session, which costs roughly 8 to 9 cents at a US residential average of about 17 cents per kWh, a figure published in the US Energy Information Administration's published average retail price of electricity to residential customers. A 5-minute toasting run costs closer to 2 cents. Across a month of normal use — say five sessions a week — that is roughly 8 to 12 kWh, or under $2. Wattage ranges from about 1,200 watts on 4-slice models to 1,800 watts on large convection countertop ovens, and the rate you pay varies more between states than the appliance does between models.
We never buy or physically handle the products we rank; recommendations come from aggregated owner reviews and manufacturer specifications, described in how we rank. More at the small kitchen appliances hub.
The Math, So You Can Run Your Own Numbers
Energy in kilowatt-hours equals watts divided by 1,000, multiplied by hours of run time. Cost equals kWh multiplied by your rate per kWh, which appears on your utility bill.
| Job | Wattage | Run time | Energy | Cost at 17 cents per kWh |
|---|---|---|---|---|
| Toast 2 slices | 1,200 W | 4 min | 0.08 kWh | About 1.4 cents |
| Reheat pizza | 1,500 W | 10 min | 0.25 kWh | About 4 cents |
| Bake chicken thighs | 1,500 W | 30 min | 0.75 kWh | About 13 cents |
| Roast vegetables | 1,800 W | 35 min | 1.05 kWh | About 18 cents |
| Same roast in a full electric oven | 3,000 W | 45 min incl. preheat | 2.25 kWh | About 38 cents |
Cook to temperature rather than to the clock — the USDA safe minimum internal temperature chart, which puts poultry at 165 degrees Fahrenheit and whole cuts of beef, pork and lamb at 145 is what decides when food is done. One caveat that makes these figures conservative: the heating elements cycle. Once the cavity reaches temperature, the thermostat cuts power intermittently, so actual consumption over a long bake is typically 60 to 80 percent of nameplate wattage times run time. Short high-heat jobs like toasting run closer to full draw the whole time.
What It Costs Where You Live
Electricity rates are the dominant variable, and the spread across the US is roughly threefold. Using EIA residential average rates as a guide, approximate cost of a 30-minute 1,500-watt bake (0.75 kWh), as of July 2026:
| Region | Approx. rate per kWh | Cost per 30-min bake | Cost per year at 5 sessions a week |
|---|---|---|---|
| Hawaii | About 42 cents | 32 cents | About $82 |
| California | About 32 cents | 24 cents | About $62 |
| Northeast (MA, CT, NH) | About 27 to 31 cents | 20 to 23 cents | $53 to $60 |
| US average | About 17 cents | 13 cents | About $33 |
| Southeast (LA, TN, GA) | About 12 to 14 cents | 9 to 11 cents | $23 to $27 |
| North Dakota, Idaho, Utah | About 11 to 13 cents | 8 to 10 cents | $21 to $26 |
Rates change, and many utilities now bill time-of-use, where the same 30-minute bake at 6 p.m. can cost two to three times what it costs at 10 p.m. Check your own bill for the rate and any peak windows before assuming the national average applies. These are averages as of 2026 and are indicative rather than a quote.
What Moves the Number
- Rated wattage. Compact 4-slice models sit at 1,200 to 1,400 watts; 6-slice and large convection countertop ovens at 1,600 to 1,800 watts. The larger cavity also takes longer to preheat.
- Convection. A fan cuts cooking time roughly 20 to 25 percent and lets you drop the temperature about 25 degrees F, which more than offsets the fan's own 20 to 40 watts.
- Preheating you did not need. Toasting, reheating and open-faced melts do not require preheat. Skipping it on those jobs saves 3 to 5 minutes of full draw.
- Door seal and glass. Worn door gaskets and single-pane glass leak heat, so the element cycles more. This is also why an old unit costs more to run than it did new.
- Standby draw. Digital models pull 1 to 3 watts around the clock — about $1.50 to $4.50 a year.
- Air conditioning load. In summer, every watt of appliance heat released indoors is heat your AC removes at a cost. Running a toaster oven rather than a full oven cuts that secondary cost meaningfully in hot climates.
Toaster Oven vs the Alternatives
For a single-serving reheat, the ranking on energy is microwave, then air fryer, then toaster oven, then full oven — and the differences between the middle three are pennies. For a tray of roasted vegetables, the toaster oven beats the full oven by a wide margin. For a full sheet pan plus a casserole, the full oven wins because you are heating one cavity instead of running two appliances.
The direct comparisons are covered in do air fryers use less electricity than an oven and toaster oven vs air fryer. For the underlying spec figures see how many watts a toaster oven uses.
If you are shopping, our best toaster oven picks rank current models on owner-reported durability and even heating rather than on wattage, which is not a quality signal. Also useful: how long toaster ovens last and how to clean a toaster oven, since a greasy element runs less efficiently and smokes.