If you want to know how much electricity your PC uses while streaming YouTube, measure it at the wall with a plug-in electricity meter. Put the meter between the wall socket and the PC’s main power cable, then run the exact playback setup you intend to leave operating.
A tower-only reading does not include a separately powered monitor. For a useful 24-hour result, record cumulative energy over the full period and convert it to average watts only after the measurement has finished.
What a plug-in meter actually measures
A plug-in power meter measures the AC electricity drawn by the equipment connected through it. In this procedure, that means the electricity entering the PC through its power cable, including the power supply’s losses and the tower’s changing workload.
That is different from a power supply unit’s rating. A PSU labelled with a particular wattage describes the supply’s capacity, not the amount the computer is using at a given moment. A PC with a higher-rated PSU can draw less from the wall than another PC with a lower-rated one, depending on its components and workload.
It is also different from a software reading. CPU and GPU utilities can report selected component values, such as CPU package power or GPU power. Those readings can help explain why the computer’s load changes, but they do not measure the whole PC at the mains socket. They do not automatically include the monitor, speakers, network equipment or other devices.
Look for a meter suitable for your local outlet and the electrical rating of the equipment you will connect. It is useful if the meter reports instantaneous watts as well as cumulative watt-hours or kilowatt-hours. A time-history function can be helpful, but it is not essential for a one-day average.
Do not choose a meter solely because it displays a momentary watt figure. Streaming workloads fluctuate when the browser renders video, the encoder changes activity, background updates run, or the PC enters a different power state. The accumulated energy over a measured interval is the more useful starting point.
The US Department of Energy’s guidance on measuring appliance and electronic energy use makes the same general distinction: when power varies, measure energy over time and divide by the measurement period to find average power. That is measurement guidance, not a YouTube-specific test protocol.
Connect the meter to the PC
Start with the equipment boundary you want to understand. If the question is “How much does my streaming tower use?”, measure only the tower. If the question is “How much does this desk consume while operating a channel?”, plan separate readings for the monitor and any other equipment you deliberately want to include.
- Switch off the PC normally and identify its main AC power cable.
- Plug the electricity meter directly into the wall socket.
- Plug the PC’s power cable into the meter.
- Check that no monitor, extension board, speaker or charger is connected through that same meter unless you intend to include it.
- Clear or note the meter’s existing energy total before beginning.
An extension lead or power strip does not invalidate the test, provided the meter is placed before the equipment being measured and the electrical rating is appropriate. For a clean tower measurement, however, connect only the PC to the meter. If several unrelated loads share the reading, you will not know which part of the total belongs to the stream.
The PC should be in the same physical and electrical arrangement used during normal operation. If you normally connect a second display, USB audio interface or external drive to the tower, decide whether those devices are part of the PC boundary. Include them consistently when comparing one setup with another.
For a computer that runs OBS on Ubuntu for a continuous YouTube stream, measure the machine with the same capture devices, storage and network arrangement used in the real broadcast. If you use a cloud-based arrangement instead, the local PC may only be used to prepare the video or check the channel, so measuring that computer answers a different question.
Before starting, record the PC model or main components, the operating system, and whether the computer is a desktop or laptop. A laptop’s charger and battery behaviour can make a wall reading different from the battery’s internal power use. For a desktop tower, the wall-side reading is usually the clearest practical boundary for the machine itself.
Run the intended YouTube stream setup
The measurement is only meaningful if the workload resembles the one you want to run every day. Open the same browser or streaming software, use the same video or playlist, select the intended resolution, and keep the display and power settings consistent.
For a channel that plays a recorded devotional loop, start the actual YouTube playback or broadcast workflow rather than leaving an unrelated video open. For a lofi or ambience channel, use the content and player settings that represent the intended overnight run. If your setup includes local encoding, capture or scene composition, leave those processes active during the test.
Note the conditions in a small measurement log:
| Item | Record this detail |
|---|---|
| PC | Model, processor, graphics hardware and memory if known |
| Workload | Browser playback, local player, encoder or streaming software |
| Video | Resolution, frame rate if relevant, and whether it is a loop or playlist |
| Display | Number of monitors, resolution, brightness and power mode |
| Network | Wired or wireless connection, if it forms part of the normal setup |
| Power settings | Sleep, display timeout and performance mode |
| Measurement | Start time, end time, starting reading and ending reading |
The display setting matters even when the stream itself is unattended. A monitor that remains on all night is a separate load from a tower that continues playing video with the display switched off. If the computer sleeps, the browser pauses, or the broadcast stops, write that down rather than treating the period as an uninterrupted stream test.
YouTube’s official live-streaming encoder settings guidance explains that stream configuration affects the work performed by the encoder. It does not provide a universal wattage for a particular PC. Use the official guidance to document your intended stream settings, then measure the computer running those settings.
If you are diagnosing interruptions as well as power use, keep a note of pauses, reconnects and software restarts. A stream that stops for part of the test may consume a different amount from one that runs continuously. The troubleshooting steps for a 24/7 YouTube stream that keeps stopping can help separate a reliability problem from a power-measurement problem.
Record energy over a measured interval
A single watt figure is a snapshot. It may be useful for seeing what the PC is doing at that instant, but it cannot tell you how much energy the machine used during a night in which its workload rose and fell.
For a practical test, let the intended setup run for a full 24 hours. Write down the meter’s cumulative energy reading at the start and at the end, or reset the meter and record the final total. If the meter shows kilowatt-hours, retain that unit. If it shows watt-hours, retain that unit until the calculation stage.
A full day is useful because it includes ordinary changes in the workload. It may capture browser activity, background maintenance, brief encoder changes and the different conditions that occur while you are away. A shorter interval can still be valid, but label it clearly and avoid presenting it as a full-day result.
Check the meter during the run without disturbing the stream. Some meters show instantaneous watts on one screen and accumulated energy on another. Do not replace the beginning or ending cumulative reading with whichever instantaneous number happens to be visible when you look at it.
If the meter resets after a power interruption, note the interruption and start again if you need a clean 24-hour result. If the stream stopped but the PC remained on, keep the reading only if that state is part of the question you are answering. Otherwise, repeat the run under the intended continuous conditions.
The useful result is usually the cumulative energy first. For example, if the meter records a certain number of kilowatt-hours during the day, that number is the tower’s measured daily energy within the boundary you chose. It is not a generic estimate for all PCs, and it should not be transferred to a different computer or playback configuration.
There is no dependable universal wattage for a PC streaming YouTube continuously. Processor choice, graphics hardware, browser rendering, video resolution, displays, power settings and background tasks all affect the result. A meter reading from your machine is more useful than a borrowed television figure or a generic online estimate.
Convert watt-hours into average watts
Watts describe power. Watt-hours and kilowatt-hours describe energy accumulated over time. Because a streaming PC changes its draw, average power is calculated from the energy measured during the interval.
Use either of these equivalent formulas:
average watts = watt-hours ÷ elapsed hours
average watts = (kilowatt-hours × 1,000) ÷ elapsed hours
The elapsed time must use hours. If you measured for 24 hours and the meter reports kilowatt-hours, multiply the reading by 1,000 and divide by 24. That produces the average wall-side power for the measured PC during that period. The calculation uses your meter’s reading; it does not assume a result for a typical computer.
If you recorded beginning and ending totals instead of resetting the meter, subtract the beginning reading from the ending reading first. For instance, an ending total of 18 kWh and a beginning total of 3 kWh means the measured interval used 15 kWh. You would then divide that energy by the number of hours in the test.
Keep the units visible in your notes. A common mistake is to divide a kilowatt-hour figure by hours and label the result as watts. The result is kilowatts unless you multiply by 1,000. Another mistake is to multiply a watt figure by 24 and call the result kilowatt-hours without dividing by 1,000.
Daily energy and average watts answer slightly different questions. Daily energy tells you what the measured setup used during the test day. Average watts smooths that result into an easier comparison with another setup measured for a different duration. If two tests have different boundaries or different workloads, the arithmetic can be correct while the comparison remains misleading.
To estimate an electricity cost, multiply the measured kilowatt-hours by the rate that applies to your bill. That rate varies by location, tariff and billing arrangement, so use your own current bill rather than a universal price. The calculation should remain separate from the measurement: first establish the equipment’s energy use, then apply the relevant rate.
Measure a separately powered monitor
A meter connected only to the tower does not include a monitor connected to another socket. This is the boundary that causes the most confusion when someone asks, “Does my PC wattage include the monitor?” The answer is no unless the monitor is physically connected through the same meter.
To measure the monitor, move the monitor’s power cable to the meter, or use a second suitable meter, and repeat the test under the same display conditions. Keep the brightness, resolution, refresh setting and power mode as close as possible to the normal setup. If the display switches off after inactivity during the real overnight routine, measure it in that state rather than leaving it permanently active for convenience.
For the cleanest comparison, measure the monitor on its own for the same interval as the PC. Record its cumulative energy, then add the monitor’s energy to the tower’s energy if your intended scope is the combined desk. If the two runs cover different durations, convert each to a common basis before comparing them. Adding two raw readings from unequal intervals can produce an incorrect total.
The same principle applies to speakers, USB hubs with their own power supplies, external storage, routers and capture equipment. Include a device only when the question is about that complete setup, and state the boundary in the result. A tower-only number and a desk-total number are both useful, but they answer different questions.
A monitor’s electricity use can change with its size, brightness and power mode, but do not borrow figures from television tests as though they were measurements of your display. The Fraunhofer streaming field report discusses tested televisions, including separate averages for larger and smaller television samples, not desktop PCs. Its findings illustrate why device and setting differences matter; they are not a prediction for your monitor.
If your aim is to understand the cost of keeping a channel online while the room is empty, measure the equipment that remains powered in that condition. If your aim is to compare two computers for encoding, exclude the monitor or measure it identically in both cases. Always write “tower only” or “tower plus monitor” beside the result.
Interpret the result without overreaching
Use the measured average as a description of one setup under one workload. It is not a permanent property of the PC. Changing the video resolution, browser, encoder, power plan or display arrangement can change the reading, so record those conditions with the result.
For a fair comparison, keep these axes constant:
- the same PC and workload, unless the purpose is to compare machines
- the same video, resolution and player or encoder settings
- the same monitor brightness and power behaviour
- the same measurement boundary
- the same units and a comparable duration
Software telemetry still has a place. A sensor utility can show whether the CPU or GPU becomes more active when you change a setting. Use it as supplementary evidence, then verify the whole machine at the wall if you need actual electricity use. Do not add a CPU sensor value and a GPU sensor value and present the sum as authoritative mains consumption.
A wall meter also has limits. It measures what passes through that meter, not energy used by equipment connected elsewhere. It may show a rounded or changing value, and different meters can expose different functions. Follow the meter’s instructions, keep the load within its rating, and avoid touching wiring or making modifications to the mains supply.
If you are deciding whether to keep a PC running or move the broadcast elsewhere, compare the complete operating boundary rather than just the tower’s peak display. A cloud-based YouTube workflow can remove the need to leave your own computer running for the broadcast; StreamNeo is designed for the specific hand-off where you upload a video, add your YouTube stream key, and leave the channel running without keeping your computer on.
For a broader comparison of publishing arrangements, the guide to YouTube-only and multi-platform 24/7 tools explains why the right choice depends on where you publish, not only on a watt figure. Whichever arrangement you choose, measure the equipment that is actually left powered and keep the channel’s reliability requirements in view.
Before committing, compare the operating options on the pricing page. When the file and channel are ready, start free — 24-hour trial, no card.
FAQ
Can software tell me my computer’s actual power draw?
Software can report selected component telemetry, such as CPU or GPU activity, but it does not provide a complete wall-side measurement of the PC. Use a plug-in electricity meter for total AC draw, including power supply losses.
How many watts does a PC use while watching YouTube?
There is no single reliable answer for every PC. Measure your own machine with the intended browser, video resolution, display and power settings running, then use the average from a measured interval rather than a momentary figure.
Does a tower-only wattage reading include the monitor?
No. A monitor connected to another socket is outside the tower meter’s boundary. Measure it separately under the same conditions and add its energy only when you want a tower-plus-monitor total.
Is a 24-hour test necessary?
It is the clearest practical interval for estimating a day’s energy use, especially when the workload changes. A shorter test can still produce an average, but record its duration and conditions and do not describe it as a full-day result.