Use this page to check microwave oven electricity consumption for your own microwave oven: enter your wattage, hours of use per day and electricity rate, and press Calculate. You see your daily, monthly and yearly cost plus your yearly kWh consumption. Those same results also cover microwave oven power consumption.
Wondering what your kitchen's quickest appliance does to your bill? Microwave oven electricity consumption is small compared with most household gear, but the numbers are worth knowing: a typical unit draws around 1,050 watts while it runs, which works out to roughly 140 kWh a year for an average household. This guide shows you how to calculate it for your own model, because the microwave in your kitchen is not the one in anyone else's example.
Before digging into formulas, here is the short version. A microwave only pulls full power while the magnetron is cooking, so total energy depends on two things: the wattage printed on the rating plate and the minutes you actually run it. Every number below uses one consistent household: a 1,050 W model, 22 minutes of use a day and an electricity rate of $0.162 per kWh.
In other words, the microwave is not an energy hog. It is one of the cheaper ways to heat food, and the rest of this article explains why.
The honest answer for most microwaves is "it depends on the model," and the power rating on the back or inside the door tells you which. Wattage is the rate at which the appliance converts electricity into heat, so a higher number cooks faster but draws more while it runs. Since typical microwave oven use is only a few minutes at a time, the average wattage across a household is far lower than the number on the label would suggest.
Capacity in liters roughly tracks wattage. Compact microwaves sit at the low end, a regular sized microwave lands in the middle, and large family units or combination microwaves reach the top. The table below converts each wattage into energy at 22 minutes a day.
| Microwave wattage | Typical capacity | kWh per day | kWh per month | kWh per year | Yearly cost |
|---|---|---|---|---|---|
| 700 W | 17-20 L | 0.257 | 7.8 | 93.7 | $15.18 |
| 900 W | 20-25 L | 0.330 | 10.0 | 120.5 | $19.51 |
| 1,050 W | 25-28 L | 0.385 | 11.7 | 140.5 | $22.77 |
| 1,200 W | 28-32 L | 0.440 | 13.4 | 160.6 | $26.02 |
| 1,500 W | 32 L and above | 0.550 | 16.7 | 200.8 | $32.52 |
Three units describe how electricity flows through the appliance, and they are easy to mix up:
To turn a rating into a bill, convert watts to kilowatts, multiply by the hours of use, then multiply by your rate. Written as a formula, the electricity usage of a microwave is: Related: mini-split heat pump power consumption.
$$\text{kWh} = \frac{\text{watts} \times \text{minutes}}{1{,}000 \times 60}$$
$$\text{Cost} = \text{kWh} \times \text{price per kWh}$$
Take the 1,050 W model run for 22 minutes a day. Here the usage duration is 22 minutes, which is 0.367 hours:
$$\frac{1{,}050 \times 22}{1{,}000 \times 60} = 0.385 \text{ kWh per day}$$
Multiply by 365 and you get 140.5 kWh for the year, then multiply by $0.162 and the annual figure is $22.77. Divide that by 12 for a monthly cost of about $1.90. If your usage is lower, the saving scales directly: ten minutes per day would use 63.9 kWh a year, while 35 minutes per day would use 223.6 kWh. A basic calculator or spreadsheet is all you need; just remember that a microwave uses power only while it runs, so the minutes on the keypad are the number that matters.
The cost to run a microwave depends as much on your electricity rate as on the appliance. Rates vary widely from one state to the next and even between times of day, so check the price per kWh on your latest utility bill rather than relying on a national average. The table shows the same 140.5 kWh annual draw at four different electricity rates.
| Electricity rate | Cost per day | Cost per month | Cost per year |
|---|---|---|---|
| $0.09 per kWh | $0.03 | $1.05 | $12.65 |
| $0.162 per kWh | $0.06 | $1.90 | $22.77 |
| $0.24 per kWh | $0.09 | $2.81 | $33.72 |
| $0.35 per kWh | $0.13 | $4.10 | $49.18 |
If your utility offers a time-of-use plan, running appliances during off-peak hours lowers the operating cost further, though with a cost this small it rarely changes how you cook. Rate-based savings matter more for larger loads than for a quick reheat. At $0.162 the cost per hour of continuous full-power running is about 17 cents, so you will not save money by obsessing over microwave minutes, only by trimming bigger loads.
Rating plates describe the maximum, and real draw often differs by ten to fifteen percent because of door seals, age and what is inside the cavity. A plug-in watt meter settles the question in a couple of minutes. Plug it between the wall and the cord, heat a cup of water for one minute, and read the live figure. Then log the accumulated reading across a normal week, and compare it to the estimate from the formula above. If the two disagree by more than a fifth, trust the meter, since it captures the exact way your household uses the appliance, including the odd thirty-second warm-up that never makes it into a diary.
To turn the reading into money, multiply the accumulated kWh by your rate: a week that logs 2.7 kWh is about 11.7 kWh a month, or roughly $1.90, which matches the worked example above and confirms the 1,050 W figure you used in the formula.
Two settings shape the real microwave power consumption in your home beyond the label wattage.
A microwave never fully switches off while it is plugged in. The clock, the display and the control board keep drawing a few watts in standby mode. At 3 W, that is 26.3 kWh over 8,760 hours per year, or about $4.26. It is not a large number, but unplugging the unit during a long holiday trims it, and models with an eco mode that blanks the display reduce it further.
Most units offer several power levels. A lower heat level, handy when food temperature must stay gentle, cycles the magnetron on and off rather than lowering its output, so the average draw falls roughly in proportion:
The energy per task still depends on usage duration, so a long defrost is not automatically cheaper than a short blast on high. Check the manual for how your power settings behave.
This is where microwaves earn their reputation. Reheating a plate takes about six minutes, so at 1,050 W it uses 0.105 kWh and costs about 1.7 cents. Household electricity use for a conventional electric oven rated 2,400 W needs 40 minutes for the same job after preheating, which means 1.6 kWh and about 26 cents. A gas oven is measured in BTU or therm rather than kWh, so its cost depends on the local gas price, but it is typically costlier than the microwave for small meals too.
An air fryer lands in between: it heats a small chamber quickly, so it also beats the full-size range for small portions. For a single serving, though, the microwave is usually the most efficient choice, with the caveat that it cannot brown or crisp food.
Because microwaves are already modest, buying advice is mostly about avoiding waste: Also see meat slicer power consumption.
Small habits also lower your energy bill: cover food so it heats faster, stir halfway, and set the exact time instead of rounding up.
Yes. A microwave uses a modest 1,050 W draw is modest for a home battery rated for several kilowatts, though the instantaneous load matters more than the daily total. Over a year, it needs about 140 kWh, which a few solar panels can offset easily: one 400 W panel producing around four peak sun hours a day makes roughly 1.6 kWh daily. For household planning, treat it as a minor entry in the electricity budget and focus your solar sizing on heating, cooling and water heating instead. Compare with how much energy does a water dispenser use.