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Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →A published benchmark puts laptop video-streaming power use at an estimated 22 watts. If a laptop averaged that much continuously, it would use about 0.528 kWh a day, or 15.84 kWh in 30 days. At an illustrative electricity rate of $0.15 per kWh, that is about $0.08 a day or $2.38 per 30-day month. Those figures are calculations from an estimate—not a measurement of every laptop streaming YouTube. The added cost depends on how much more power the laptop uses during playback than it would in its normal idle state, as well as your electricity tariff.
Estimate the electricity cost
The Carbon Trust’s 2021 appendix lists 22 W as an estimated laptop power draw for streaming video, attributing the figure to Singh et al. (2019). It is a useful benchmark, but it is not a controlled, current measurement of every laptop, YouTube stream, or viewing setup.
| Period | Energy at a steady 22 W | Cost at an illustrative $0.15/kWh |
|---|---|---|
| 24 hours | 0.528 kWh | About $0.079 |
| 30 days | 15.84 kWh | About $2.38 |
The $0.15/kWh rate is an assumption for illustrating the arithmetic, not a typical or recommended rate. Use the price per kWh on your own bill; tariffs vary by location, supplier, and plan. The 30-day month is also just a convenient calculation period.
Calculate for your own setup
Use average power draw in watts, not the maximum wattage printed on the laptop’s power adapter:
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kWh = watts × hours ÷ 1,000Cost = kWh × your electricity price per kWh
To estimate the added electricity use compared with leaving the laptop in its ordinary state, first subtract its baseline draw from its playback draw:
Incremental kWh = (playback watts − baseline watts) × hours ÷ 1,000Incremental cost = incremental kWh × your electricity price per kWh
There is no universal idle-versus-YouTube power difference established by the sources here. The 22 W benchmark represents estimated streaming draw; it does not tell you how many of those watts are extra for your laptop.
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Why your actual power draw can differ
Power use depends on the laptop and its settings, the display brightness, playback and video settings, network connection, and background tasks. Microsoft’s Windows battery-testing guidance recommends consistent test conditions, including setting the screen to 150 nits. That controlled condition helps make comparisons meaningful; it is not a claim that every person watches at that brightness.
A plug-in electricity meter can measure the combined laptop-and-adapter draw at the wall, including adapter conversion losses. It is optional: you do not need to buy one to use the benchmark. If you want a personal estimate, take readings in playback and baseline states, then apply the same observation period and electricity tariff to both.
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- Keep the laptop, power adapter, network, and other conditions as consistent as practical.
- Measure average wall power during the kind of playback you want to estimate.
- Measure average wall power in the laptop’s ordinary baseline state.
- Subtract baseline watts from playback watts, then use the incremental-cost formula above.
What it means for battery runtime
On battery, continuous playback will eventually drain the charge, but there is no responsible single runtime figure without the laptop’s usable battery capacity and its actual average draw. A rough estimate is usable battery capacity in watt-hours divided by average power draw in watts. Real runtime varies with the device, software activity, and power-management settings.
A local-file playback test is not the same as streaming YouTube over Wi-Fi. Microsoft’s Surface battery testing describes playback of a local 1080p video and cautions that battery life varies with settings, usage, and other factors. Its result should not be treated as an exact prediction for online YouTube playback.
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Does leaving a laptop plugged in harm its battery?
The available manufacturer guidance does not establish a universal amount of damage from running a laptop plugged in for a 24/7 stream, or a general battery-aging rate for that schedule. ASUS notes that discharge depends on the laptop’s software operations and power-management settings, and describes charge-protection behavior on some systems. Battery-management features differ by model.
- Check the support guidance for your exact laptop model.
- If the model offers a built-in charge limit or battery-health mode, consult its instructions for using it.
- Keep airflow unobstructed as ordinary device care.
Keep a YouTube stream running without keeping a laptop on
If your goal is an always-on YouTube channel rather than measuring laptop consumption, StreamNeo is a cloud service that loops uploaded videos or playlists, so the stream can continue while your computer is off. It streams to YouTube, not from a live camera. StreamNeo’s one-flat-price-per-slot approach supports uploaded quality up to 4K at 60 fps without re-encoding; its first day is free with no card.
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- Add your YouTube stream key once.
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Quick Recap
Sources and further guidance
- Carbon Trust, Carbon impact of video streaming — Appendix (2021): the 22 W estimated laptop streaming figure, attributed to Singh et al. (2019).
- Microsoft Learn, Local Video Playback: Windows battery assessment method and test-condition guidance.
- ASUS, Notebook Battery Information Center: battery behavior and factors that affect discharge.
- Microsoft Support, Surface battery testing and estimated performance: local-video test context and battery-life variation.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
