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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesUsing a published 22-watt laptop video-streaming estimate as a rough benchmark, running a laptop continuously would use about 0.528 kWh a day, or 15.84 kWh in a 30-day month. At an assumed electricity rate of $0.15 per kWh, that works out to about $0.08 per day or $2.38 per 30-day month. Those are calculations from an estimate—not a current, universal measurement of YouTube streaming or a prediction for your particular laptop. Your actual added cost depends on the laptop’s average draw while playing video, what it uses in its normal state, and your electricity tariff.
What the 22-watt estimate means
The Carbon Trust’s 2021 appendix gives an estimated laptop power draw of 22 W for streaming video, attributed to Singh et al. (2019). It is a useful benchmark, but it is not a controlled current test of every laptop, YouTube stream, or viewing setup. No directly comparable figure establishes the wall power of a laptop running YouTube 24/7 or the extra power used specifically for YouTube playback.
At 22 W, the arithmetic is:
- One day: 22 W × 24 hours ÷ 1,000 = 0.528 kWh.
- Thirty days: 0.528 kWh × 30 = 15.84 kWh.
- Illustrative cost: at an assumed $0.15/kWh, 0.528 × $0.15 is about $0.079 per day, and 15.84 × $0.15 is $2.376—about $2.38 for 30 days.
The $0.15 rate is only an example. Use the per-kWh rate on your own electricity bill. The 30-day period is for convenient arithmetic, not a claim about every billing month. The 22 W figure should not be mistaken for the laptop’s added draw over idle or ordinary use.
How to estimate your own electricity cost
Use average power at the wall, not the maximum wattage printed on the laptop’s power adapter. For total electricity use:
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kWh = watts × hours ÷ 1,000
cost = kWh × your electricity price per kWh
If you want the cost added by playback compared with leaving the laptop in its usual state, measure both states and subtract the baseline:
incremental kWh = (playback watts − baseline watts) × hours ÷ 1,000
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incremental cost = incremental kWh × your electricity price per kWh
Measure at the wall for a personal figure
- Measure the laptop and power adapter together while the laptop is in its ordinary baseline state. Use the same plugged-in or battery condition you intend to compare.
- Measure again during video playback. Keep the conditions consistent: screen brightness, video resolution, Wi-Fi connection, power settings, and background apps can all affect the result.
- Use average watts from the meter for each state, then apply the formulas above for the number of hours you plan to stream.
A plug-in electricity meter is optional; it can measure the combined laptop-and-adapter load, including adapter conversion losses. A measurement is only representative of the conditions under which you took it. If you are following a controlled battery test rather than measuring YouTube playback, Microsoft’s Local Video Playback assessment recommends consistent conditions and includes a 150-nit screen-setting guideline.
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Will a 24/7 stream drain the battery?
On battery, continuous playback will eventually use up the available charge, but there is no responsible single runtime estimate without your laptop’s usable battery capacity and its actual average power draw. A rough calculation is usable battery watt-hours divided by average watts; real runtime varies with hardware, software activity, and power-management settings. ASUS notes that discharge depends on software operations and power-management settings, and that video playback can consume more power than general word processing.
A test using a local video file is not an exact YouTube-over-Wi-Fi test. Microsoft’s Surface battery testing describes playback of a local 1080p file and cautions that battery life varies with settings, usage, and other factors. Treat a local-file result as a controlled comparison, not a promise for a live YouTube stream.
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Does leaving it plugged in harm the battery?
The manufacturer guidance cited here does not establish a universal amount of battery damage from leaving every laptop plugged in during continuous playback. Battery protection features and charging behavior differ by model. ASUS describes charge-protection behavior on some systems and says battery-life decline varies with design and use. Check the support guidance for your exact laptop, and use its built-in charge limit if one is available. Keep the laptop’s vents unobstructed as ordinary device care; the available evidence does not support a general battery-aging rate for a 24/7 YouTube schedule.
What changes the result?
- Playback versus baseline: To estimate the added bill, subtract the laptop’s usual draw from its playback draw. The sources do not establish a universal idle-to-YouTube difference.
- Screen and video settings: Brightness and video settings affect consumption. Microsoft’s battery-testing guidance emphasizes consistent test conditions; its local playback method uses a 150-nit screen setting.
- Hardware and background activity: Laptop design, software operations, power management, and background tasks can change power use.
- Connection and viewing conditions: A YouTube stream over Wi-Fi differs from a local video test. Keep the network and other conditions consistent when comparing measurements.
- Electricity tariff: Rates vary by location, supplier, and plan. The example cost applies only to the explicitly assumed $0.15/kWh rate.
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