Want to see your chromecast power consumption? Enter your wattage, how many hours a day you run it and what you pay per kWh as your electricity rate, then hit Calculate to get the monthly cost and kWh used on your bill.
Wondering what that little dongle behind your TV adds to your electric bill? Chromecast power consumption is modest: a few watts at most, which works out to a few dollars annually. This guide shows you the wattage to expect, how to measure it on your own setup, and how it stacks up against other streaming devices, so you can decide whether the idle draw deserves any of your attention.
Every Chromecast is powered through an external power converter that plugs into a wall outlet or, on older models, a USB port on the TV. The label printed on that adapter tells you the ceiling for the power draw: voltage multiplied by current. A device cannot pull more than its adapter is rated to deliver, and in practice it uses much less, because the label describes the maximum the adapter can supply, not what the stick asks for during normal playback. Next, look at escalator power consumption.
| Adapter rating | Maximum output | Typical use |
|---|---|---|
| 5 V at 1 A | 5 W | Earlier HD sticks with a Micro-USB plug |
| 5 V at 1.5 A | 7.5 W | Models with 4K output or a USB-C plug |
So a Chromecast can never pull more than 5 to 7.5 W, and its real average sits far below that. Treat the table as a ceiling, not a forecast. Real-world averages sit well below it, and the exact figure depends on the model, the firmware and what the stick is doing at that moment.
The Chromecast Ultra ships with a mandatory power supply, and that supply has an Ethernet jack built in. A wired connection removes WiFi radio traffic from the picture, but the adapter itself still draws a little current, so expect a small bump compared with a wireless setup.
The Chromecast with Google TV runs a full operating system, an interface you navigate with a remote, and apps installed directly on the stick. That makes it a more capable computer than the original cast-only dongle, and a more capable computer generally means a slightly higher baseline. The same logic explains why a set-top box usually draws more than any stick.
A Chromecast has no off switch. Once it is plugged in, it stays awake so it can wake your TV, receive a cast request and quietly download updates. That means Chromecast idle power is the number that matters most over a year, because the device spends the large majority of its day doing nothing visible. This is the classic vampire power pattern: a small continuous load that never really stops.
Streaming adds a little on top of the baseline. Decoding a 4K HDR stream from Netflix asks more of the chip than a low-bitrate YouTube clip, and a weak WiFi signal can push the radio to work harder. Even so, active use typically adds only a modest bump, and the hours spent playing are usually fewer than the hours spent waiting. Multiply a small difference by a short window and the idle hours still win.
Your utility bills you for each kilowatt-hour you use, not for raw power ratings. Convert a meter reading with two short steps: multiply the average draw in W by the hours it runs to get watt hours, then divide by 1,000.
$$\text{annual kWh} = \frac{\text{W} \times \text{hours per day} \times 365}{1000}$$ $$\text{yearly price} = \text{annual kWh} \times \text{electricity rate}$$Here is a hypothetical case with numbers chosen purely for illustration. Suppose a meter shows an average of 2.4 W while the stick idles and 3.8 W while it plays, you watch for 3.25 hours a day with the TV on, and your electricity rate is $0.1462 per kilowatt hour.
| Mode | Average draw | Hours per day | Watt hours per day |
|---|---|---|---|
| Idle | 2.4 W | 20.75 | 49.80 Wh |
| Playing | 3.8 W | 3.25 | 12.35 Wh |
| Total | 24 | 62.15 Wh |
That is 62.15 Wh a day, or about 22.68 kWh per year. At $0.1462 that is roughly $3.32 per year, or about $0.28 a month. Notice that idle time supplies around 80% of the total, even though the stick is working hard for only a few of those hours.
Your monthly statement will not move in any way you can see. Even at a steep rate such as the highest in the country, which is found in Hawaii, the same 22.68 kWh stays in the single digits per year. Use your own local rate in the formula above rather than a national average, since the multiplier is the only part that changes.
Estimates are useful, but a reading from your own outlet beats every table on the web. Two inexpensive tools do the job. A smart plug with energy monitoring logs consumption in its app, and a plug-in Kill-A-Watt style meter shows a running total on its screen. Next, look at how much energy does a freezer use.
You can unplug the adapter, but the savings are small and you give up convenience. With the stick fully powered down, it cannot wake your TV, switch inputs or install updates in the background. Booting it back up also pulls more current for a short stretch than idling does, so repeatedly turning it off and on again can erase part of the gain.
Using the earlier example, cutting power for eight hours every night saves about 7.01 kWh, or roughly $1.02 per year. That is a real saving in percentage terms and a trivial one in dollars.
Stick-shaped streaming media players sit at the low end of the scale. Bigger boxes such as the Roku Ultra, an Apple TV or a Fire TV carry faster processors, storage, extra ports and sometimes a fan, so they usually draw more at idle and while playing. The gap is wider still against a cable company's DVR. Compare streaming devices by looking at their idle figure first, because that is where the hours pile up. Next, look at how much energy does a water filter use.
If you are replacing an older Roku Ultra purely to save money, the payback will be long; replace it because you want better features. Likewise, an Apple TV or Fire TV owner who adds a Chromecast as a second device roughly doubles the idle load, but the additional energy use still amounts to pocket change.
No. The cost of leaving a Chromecast plugged in is negligible next to a refrigerator or a gaming PC. Your own estimates will vary with your rate and habits, but the answer will almost always be a few dollars. Once you know the numbers, you can leave it plugged in and spend your effort on the appliances that actually move your bill.
The question is not whether the Chromecast power consumption is worth worrying about; it is whether your time is better spent on larger loads. For most households, it is.