The cost to run a 24/7 YouTube stream on an old desktop depends on two things: the computer’s average power draw at the wall while streaming, and your electricity rate. Once you measure those, the calculation is straightforward.
Monthly energy is average watts × 24 hours × 30 days ÷ 1,000. Monthly electricity cost is that kWh figure × your price per kWh. The desktop’s age, power-supply rating and stream bitrate cannot give you a dependable price on their own.
Why there is no single old-PC price
“Old desktop” covers too many different machines to support one useful estimate. A small office computer, a tower with a separate graphics card and a machine running an always-on monitor may all handle the same playlist while drawing different amounts of power. The difference can also change when the encoder, cooling system or graphics hardware becomes active.
The power-supply label is not a measurement of normal consumption. A supply rated for a particular maximum output can serve a computer that usually draws much less, and the rating does not include the monitor or other equipment connected to the wall.
The stream workload matters, but bitrate and electricity use are separate measurements. YouTube’s current H.264 guidance includes 5 Mbps for 1080p30 and 3 Mbps for 720p30, with constant bitrate and a two-second keyframe interval recommended. Those settings describe the signal sent to YouTube, not the number of watts your particular computer will draw. See YouTube’s live encoder settings before testing, then measure the resulting setup rather than converting Mbps directly into watts.
For a practical estimate, record four details:
- the average wall draw while the intended stream is running
- how many hours per day the equipment will be on
- your marginal electricity price per kWh
- whether the measurement includes a monitor, speakers, router or other equipment you intend to leave on
If the computer will run continuously, use 24 hours per day. If you will turn it off overnight, use the actual daily schedule instead. That distinction is more useful than calling the machine efficient or inefficient without a measurement.
Measure average wall draw while streaming
The most important step is measuring the complete setup under its real workload. A plug-in electricity usage monitor can show accumulated energy and, depending on the device, live power readings. It is optional, but it is more reliable than guessing from the desktop’s age or the maximum rating printed on its power supply.
Connect the equipment you want to cost to the meter. If the desktop and its monitor will both remain on, measure them together. If the monitor will sleep while the broadcast continues, measure the desktop separately and decide whether the monitor’s occasional use belongs in the estimate. Make the boundary explicit so you do not compare one calculation that includes a display with another that does not.
Start the stream using the file, resolution, frame rate and encoder arrangement you expect to use overnight. Let the computer settle before recording the result. A brief reading taken while an application is opening may not represent the average draw during a long broadcast. The EPA’s older measurement material describes using meters that accumulate readings over a chosen interval; it supports the general method of measuring over time, not a universal wattage for an old desktop. You can review that ENERGY STAR measurement document for the measurement context.
A longer representative interval helps smooth out changes caused by loading the next file, displaying a scene, or briefly increasing encoding activity. Write down the meter’s accumulated energy if it provides that reading. If it only shows changing watts, take repeated readings and calculate an average, or use a meter that records energy over time.
Keep a small test note with:
| Item | What to record | Why it matters |
|---|---|---|
| Computer | Desktop model or a simple description | Makes a later retest identifiable |
| Stream | Resolution, frame rate and encoder | Defines the workload being measured |
| Equipment included | PC only, or PC plus monitor and peripherals | Sets the boundary of the cost |
| Meter result | Average watts or energy over the test | Supplies the calculation input |
| Network use | Whether other household use was present | Helps explain stream interruptions |
Do not treat the stream’s upload bitrate as a substitute for this test. A higher video setting may increase encoding work on some systems, while hardware acceleration or the source material may change the result on others. YouTube’s guidance gives recommended stream settings, but it does not supply a wattage for your computer.
Calculate monthly kWh from measured watts
Once you have an average wall draw, convert it into monthly energy. For a computer running all day and night, use this formula:
Monthly kWh = average watts × 24 × 30 ÷ 1,000
The 30-day month is a convenient comparison period. Your actual bill may cover a different number of days, so you can replace 30 with the number of days in the billing period when you want a closer estimate.
Suppose your meter records an average of 60 W for the equipment included in the test. That is an example calculation, not a measured result for an unspecified old desktop:
60 × 24 × 30 ÷ 1,000 = 43.2 kWh per 30-day month
The same method works for any measured result. If the meter records 75 W, substitute 75. If your stream runs for only 12 hours a day, use 12 rather than 24. Keep the measured wattage and the operating schedule visible in your notes, because changing either changes the answer.
A useful shortcut is that every continuous 10 W becomes 7.2 kWh in a 30-day month. Every continuous 50 W becomes 36 kWh. These are unit conversions, not claims about what your desktop consumes.
Do not add the computer’s power-supply capacity to the result. Do not use a generic desktop figure from a search result. The calculation is only as auditable as the wall measurement behind it.
Apply your electricity rate
Take the monthly kWh and multiply it by the price that applies to the additional electricity you use. The basic formula is:
Monthly electricity cost = monthly kWh × price per kWh
If your measured setup used 43.2 kWh and your applicable rate was $0.20 per kWh, the arithmetic would be:
43.2 × $0.20 = $8.64 for a 30-day month
This is an illustration using an assumed rate, not a statement about your tariff. Use the rate on your bill where possible. Depending on your country and plan, the relevant figure may be shown in a tariff schedule, an electricity app or a bill rather than as one simple all-in number.
If your bill has time-of-use pricing, a stream that runs through several periods may not have one rate. Split the calculation by period. For example, multiply the energy used during each tariff period by that period’s price, then add the results. If your bill includes a fixed standing charge, do not assign the whole charge to the stream unless you would avoid it by switching the setup off.
For readers in India, check whether the bill uses slabs, fixed charges, taxes or other adjustments. The marginal cost of the next units may not be the same as the average amount paid across the bill. If you cannot separate those elements, label the result as an estimate and use the clearest rate supplied by your electricity provider.
Electricity is not the only possible operating cost. A continuous stream may use upload data, and an internet plan may have a data cap or usage terms. YouTube recommends leaving 20% upload-bandwidth headroom and notes that other users sharing the connection can reduce what is available. Its live streaming bandwidth guidance is useful for checking the network side, but your internet cost still depends on your plan and actual upload setting.
The 2025 U.S. benchmark and its limits
For a dated illustration, the U.S. Energy Information Administration reported a 2025 U.S. annual average residential electricity price of 17.30 cents per kWh, as listed on the U.S. Energy Information Administration’s site in 2025. At that rate, a continuously drawn 100 W load uses 72 kWh in a 30-day month:
100 × 24 × 30 ÷ 1,000 = 72 kWh
72 × $0.173 = $12.456
Rounded to the nearest cent, that is about $12.46. The research benchmark commonly expresses the same result as about $12.60 when rounded using a simplified presentation. Either way, the important point is the method, not false precision. This is arithmetic at the dated EIA benchmark, not a statement that an old desktop draws 100 W.
The EIA’s 2025 state average, as published, ranged from 8.20 cents per kWh in North Dakota to 35.72 cents per kWh in Hawaii. The published range is across all types of utility customers, so it should not be treated as a residential-only comparison or as your tariff. The EIA also identifies the annual figures as preliminary. Check the EIA electricity prices page for the source and current context.
At the same 17.30-cent benchmark, each additional continuous 10 W adds 7.2 kWh per month, or about $1.25 at the unrounded arithmetic rate. Each additional continuous 50 W adds 36 kWh, or about $6.23. These are adjustable examples at the dated national benchmark. They are not measurements, forecasts or a claim about any particular PC.
A reader in another country should not substitute the EIA figure for the rate on their bill. A reader in the United States should also avoid treating the national average as proof of their state, utility or billing plan. The benchmark is useful because it makes the calculation easy to inspect, not because it settles the answer.
Reduce uncertainty before leaving it overnight
The best estimate is usually produced by testing the exact arrangement you plan to leave running. That means using the final video file, playlist behaviour, resolution, frame rate and encoder. If you later switch from 720p30 to 1080p30, or move from software encoding to hardware-assisted encoding, repeat the measurement rather than assuming the cost stayed the same.
YouTube recommends testing before going live and monitoring stream health. You can use the YouTube live control room guidance to check the channel and broadcast workflow. A stable wall-power result does not prove that the internet connection, channel or encoder will remain healthy all night.
Keep the display boundary consistent. Measuring the PC alone gives a computer cost. Measuring the PC, monitor and speakers gives a broader workstation cost. Neither is automatically right; the useful choice is the one that matches what you intend to leave switched on.
Separate electricity uncertainty from internet uncertainty. A computer may draw the same power while a stream buffers, but a connection with insufficient upload capacity can still interrupt the broadcast. YouTube’s recommendation to keep 20% headroom is a planning margin, not a guarantee of uninterrupted service. Other people using the connection can consume that margin.
If the old desktop needs manual attention after a crash, include the practical cost of checking it. An electricity estimate can be low while the arrangement remains unsuitable for a channel that must run overnight. A machine that requires someone to restart the encoder at 3 am may be less useful than a slightly different operating arrangement, even when the energy figures are close.
For a computer-based setup, compare the measured wall draw with the work involved in keeping the process running. If the recurring problem is leaving a PC switched on, watching for disconnections and restarting a failed broadcast, StreamNeo removes that particular need by letting you upload the file once and run the YouTube broadcast without keeping your own computer on.
PC, network and cloud choices
Running an old desktop can make sense when you already own the equipment, the measured draw is acceptable and you are comfortable testing and maintaining it. It also keeps the source files and encoder under your control. The trade-off is that the computer, household power and internet connection all remain part of the overnight system.
A lower-resolution stream may reduce the workload on some computers, but you should verify that with a meter. YouTube lists 1080p30 at 5 Mbps and 720p30 at 3 Mbps among its H.264 recommendations. A lower bitrate can also reduce upload demand, but it is not a direct promise of lower electricity use. Use the visual quality your audience needs, then test the actual arrangement.
If you want to keep experimenting with a local setup, guides such as OBS versus FFmpeg for a 24/7 stream and automatic FFmpeg reconnection address operational choices rather than electricity prices. If your connection is in India, the practical checks in keeping an FFmpeg YouTube stream running on Airtel broadband may also be relevant. These guides do not replace measuring the wall draw of your own equipment.
You should also confirm that your channel can livestream. YouTube requires a verified channel without livestreaming restrictions in the previous 90 days, and first-time livestreaming may take up to 24 hours to enable. Check the current official requirements before planning a launch, especially if the channel has never gone live.
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
How much does it cost to run a computer 24/7?
There is no reliable single price without the computer’s measured average wall draw and your electricity rate. Multiply watts by 24 hours, 30 days and divide by 1,000 to get monthly kWh, then multiply by your price per kWh.
How much electricity does a PC use while streaming?
It depends on the specific PC, encoder, source material and connected equipment. Measure the complete setup while the intended stream is running rather than inferring consumption from the machine’s age, power-supply rating or bitrate.
Is it expensive to leave an old desktop running all day?
The answer depends more on measured watts and your tariff than on the word “old”. A low-draw computer at a low rate may be manageable, while a higher-draw tower, monitor and local tariff can produce a noticeably larger bill.
Does lowering the YouTube bitrate reduce the electricity cost?
It may change the encoding workload on some systems, but YouTube bitrate is not a direct measure of wall power. Test the new resolution, frame rate and encoder settings with a meter before using a different figure in your monthly calculation.