A used Dell OptiPlex does not have one fixed cost to run around the clock. Your bill depends on its average power draw while doing the actual stream, the equipment you leave switched on, and the all-in electricity rate on your bill.
The useful calculation is simple: measure watts at the wall, convert them to kilowatt-hours, then multiply by your tariff. Published idle readings can help you understand scale, but they are not measurements of a 24/7 YouTube encoding session.
What determines an OptiPlex’s running cost
The OptiPlex model and configuration matter, but the number that ultimately affects your electricity cost is the average wall draw of the setup you intend to leave running. A Micro, SFF or tower may contain different processors, storage, memory and power supplies. Even two used machines with the same model name may be configured differently.
The load also matters. An idle desktop is not necessarily representative of a machine reading a video file, encoding it and sending it to YouTube. Nor does a maximum-load test tell you precisely what the machine will draw during your stream. The stream’s resolution, frame rate, codec, playback method and other software can affect processor use, but you still need a wall measurement to know the resulting electrical draw.
YouTube’s live encoder settings guidance covers codecs, frame rates and recommended bitrates. It recommends constant bitrate and a two-second keyframe interval, and advises testing with representative audio and movement. Those settings help define the workload you should test; bitrate is an upload-bandwidth setting, not a way to calculate electricity consumption.
Other equipment can be part of the cost. An always-on display, USB audio interface, external drive, capture device, router or network switch all consume power if left on. Decide whether you want the cost of the OptiPlex alone or of the complete streaming corner, then measure that same boundary throughout. A comparison of an OptiPlex-only reading against someone else’s PC-plus-monitor figure will not tell you which stream is cheaper.
The power rating printed on an adapter is not the computer’s constant draw. A 90 W adapter, for example, indicates a rated capacity, not that the system continuously uses 90 W. Estimating the bill by multiplying the adapter rating by the hours in a year can substantially misstate consumption.
Measure the complete setup at the wall
A plug-in electricity usage monitor is the practical way to measure a desktop setup that draws power through a standard wall socket. Connect the equipment you want included in the bill through the monitor, then observe the watt reading after the system has started the intended stream and settled into normal operation. If the display shows energy over time as well as watts, that can make an average easier to interpret.
For a useful test, use the same file, playback method, encoder, resolution, frame rate and codec that you expect to run overnight. Leave the intended audio and other applications running. Let the stream reach its normal state rather than measuring only the brief period when an application opens or a file starts. If the machine alternates between heavier and lighter work, observe it for a representative period instead of relying on one instantaneous number.
Keep the measurement boundary clear. If you want to know the OptiPlex’s draw, plug in only the OptiPlex. If you want the cost of keeping the whole station ready, include the display, audio equipment and other devices that remain powered. A network router may be needed for streaming, but you may prefer to account for it separately if it serves the rest of your home as well.
Write down the observed average watts and the test conditions. Include the OptiPlex form factor and broad configuration if known, the stream’s resolution and frame rate, and what peripherals were included. This makes your result useful when you later change software or replace equipment. It also stops an idle reading being mistaken for an active-stream reading.
If a wall monitor is unavailable, you can still estimate from a reliable average reading for the complete setup, but label it as an estimate and state what the reading represents. A software utility may report component or system estimates, but those do not necessarily include conversion losses or attached devices. For a bill estimate, wall power is the more direct measurement.
Treat YouTube’s testing advice as part of the measurement process, not as evidence of a power figure. The Help page recommends a speed test for upload bitrate and monitoring stream health. Check that the stream is behaving as intended while measuring; a machine that is failing to play the file smoothly or repeatedly reconnecting is not a representative steady-state setup.
Convert watts into annual kilowatt-hours
Electricity bills normally charge for energy in kilowatt-hours (kWh), while a meter’s live display often shows watts. For a continuous 24/7 setup, use this conversion:
Annual kWh = average watts × 8,760 ÷ 1,000 = average watts × 8.76.
There are 8,760 hours in a non-leap year. Dividing watts by 1,000 changes the unit to kilowatts, and multiplying by hours produces kilowatt-hours. For example, if your actual setup averaged 20 W at the wall, the calculation would be 20 × 8.76 = 175.2 kWh per year. That is an illustration of the arithmetic, not a claim that a particular OptiPlex stream draws 20 W.
For a monthly estimate, divide annual energy by 12, or multiply the average watts by 0.73. The latter follows from 8.76 ÷ 12. At 20 W, that is 14.6 kWh per average month. Month lengths vary, so annual energy divided by 12 is a planning average rather than the exact energy used in each calendar month.
A continuous stream may not actually run for all 8,760 hours. If the computer is off for scheduled maintenance or outages, adjust the hours to match your operation. The general formula is average watts × hours running ÷ 1,000. For example, use the actual expected operating hours in place of 8,760; do not quietly apply a 24/7 annual figure to a part-time schedule.
This conversion also gives a quick way to compare changes. Every extra watt of average draw adds 8.76 kWh over a year of continuous operation. Whether that is material to your bill depends on your tariff. If you reduce power by changing a playback or encoding setting, repeat the wall test under the new conditions and use the new average rather than assuming a setting saves a fixed amount.
Apply your all-in electricity rate
Use the price per kWh that best represents what you pay, including the applicable electricity charges and taxes for your account. If your bill has different rates by time of day, use a weighted estimate based on when the stream runs. If it contains fixed monthly charges that you would pay whether the computer runs or not, those do not belong in the marginal cost of powering this setup.
The U.S. Energy Information Administration reports a 2025 U.S. residential average of 17.30 cents per kWh, based on Electric Power Monthly data identified as February 2026 preliminary data. This is a reference point for U.S. residential customers, not a universal rate and not a substitute for your own bill. EIA’s electricity prices and factors page also explains why prices vary by location and customer type.
At that residential reference rate, multiply annual kWh by $0.173 to estimate annual cost. For a different currency or tariff, keep the units consistent: convert your rate to the same currency per kWh, then multiply by your measured kWh. A small shop with a commercial account should use its commercial tariff, not the U.S. residential comparison. A reader in India should use the rate and billing structure applying to their own connection; a national or foreign average cannot stand in for a household or business bill.
If you only know a per-unit price on a bill, confirm what the unit means. In many bills, one unit means one kWh, but check the bill’s own definitions and line items. Where fuel adjustments, taxes or tiered rates apply, a single headline rate may give an incomplete estimate. For a practical decision, calculate with the marginal amount you expect an additional kWh to cost, and retain the bill’s local currency.
Annual cost is annual kWh multiplied by the all-in price per kWh. Monthly average cost is annual cost divided by 12. Keep the energy and price calculation separate until the final multiplication; this makes it easier to replace either your wall measurement or your tariff later.
Worked examples from published readings
The following figures show how to turn specific published idle readings into a cost calculation. They are examples of those machines at idle, not measurements of continuous YouTube streaming. They should not be treated as a prediction for another used OptiPlex or for an active encoder.
ServeTheHome’s review of a Dell OptiPlex 7070 Micro with a six-core processor measured just over 13 W idle at 120 V. Gough’s Tech Zone reported 13.3 W idle for an OptiPlex 7050 SFF without peripherals in its Windows 11 desktop test, and 15.8 W with peripherals connected. The latter test used a Tektronix PA1000 power analyser. Under Ubuntu 24.04 with a SATA SSD, the same author reported 12.7 W without peripherals and 14.9 W with them. These results describe their test systems and conditions, not a controlled comparison of every OptiPlex.
For clarity, the table uses 13 W and 15.8 W as rounded or reported idle scenarios, and the U.S. residential average cited above only as an illustrative tariff. The cost column is calculated from 17.30 cents per kWh; it is not a price every reader pays.
| Idle scenario | Annual energy at continuous draw | Annual cost at $0.173/kWh | Monthly average |
|---|---|---|---|
| 13 W example | 113.9 kWh | about $19.70 | about $1.64 |
| 15.8 W example | 138.4 kWh | about $23.95 | about $2.00 |
The calculations follow the same formula: watts × 8.76 for annual kWh, then multiply by the tariff. The 13 W row is a rounded illustration based on the “just over 13 W” report, so it should not be read as a more precise result than the source. The 15.8 W row corresponds to the reported Windows desktop setup with peripherals. Neither row establishes what that hardware would draw while encoding a live stream.
The SFF test also reported roughly 85–89 W under Prime95/mprime load, depending on operating system and peripherals. That is a stress-test result, not a suitable proxy for ordinary playback and live encoding. It is useful mainly as a reminder that operating state matters. The correct number for your cost estimate is your representative stream’s average wall draw, not an idle value, a stress-test peak or the adapter rating.
To make the table personal, replace its watts with your own stream measurement and replace $0.173 with your own rate. If your measured setup averages 24 W, for instance, calculate 24 × 8.76 to get annual kWh, then multiply by your local price per kWh. Use your own measurement rather than carrying over the example’s idle label or its U.S. tariff.
Account for peripherals and operating conditions
Peripherals can shift the total, especially when the computer itself is low-power. The 7050 SFF test illustrates this: its reported idle reading increased when peripherals were connected. That does not establish a universal amount for a monitor or accessory; it shows why the measurement should include the devices that actually stay on. A USB drive used only during file transfer is different from one that remains connected throughout the stream.
The power draw can also vary with what the stream is doing. A static image with quiet audio may not put the same work on the system as a video with movement or an audio visualiser. A codec or frame-rate change can alter processing needs. YouTube’s encoder guidance sets out supported and recommended configurations, and asks streamers to test representative content. Use the configuration you plan to broadcast, then measure it; do not infer watts from the selected bitrate alone.
For a pre-recorded loop, playback method matters too. If you are using OBS, confirm that the media plays reliably before judging the machine’s resource use. The practical checks in the guide to fixing OBS media-source stuttering with large MP4 files can help distinguish a playback issue from a general assumption that a particular processor is too weak. Once the stream is stable, return to the wall measurement.
If processor use seems unnecessarily high, check whether the playback and encoding choices suit the computer. Reducing CPU use for a 24/7 Indian music stream covers practical workload considerations. That can help you choose what to test, but a lower CPU percentage does not by itself tell you how much electricity you saved. Compare wall readings under the same conditions before and after a change.
Audio is another part of a continuous channel that deserves a test, particularly for devotional, bhajan, lofi or ambience programming. Make sure the loop behaves as intended and does not require a display or extra playback equipment you had not included in the estimate. The advice on audio settings for 24/7 streams can help you prepare the stream’s sound, while the electricity calculation remains based on measured watts.
Ambient temperature, dust, fan behaviour and the condition of a used machine can affect how it runs, but do not add a guessed adjustment to the estimate. Clean and maintain the computer sensibly, ensure ventilation is not blocked, and measure the result in the conditions where it will operate. If the PC is in a warm cupboard or a dusty room, test it there rather than assuming a short desk test captures every overnight condition.
Finally, electricity is only one part of the cost of keeping a local computer online. A PC at home also depends on your internet connection and power staying available, and may need attention after updates or interruptions. If the recurring burden is checking the local machine and restarting a dropped broadcast, that is a different operational issue from the energy arithmetic; StreamNeo removes that particular need to keep your own computer running for the broadcast, while you still need to prepare the video and YouTube channel.
For the electricity question, however, compare like with like: same stream workload, same included equipment, same measurement duration and the same local tariff. That produces a reader-specific estimate rather than a universal promise about what a used OptiPlex costs.
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 an OptiPlex 24/7?
There is no single figure because the model, workload, peripherals and electricity rate vary. Measure the average wall draw while the intended stream is running, multiply watts by 8.76 for annual kWh, and multiply by your all-in price per kWh. An idle reading is not a verified live-stream measurement.
Does a 90 W OptiPlex power adapter mean it uses 90 W all the time?
No. The adapter rating describes its capacity, not the computer’s constant consumption. Use a wall reading for the actual setup rather than multiplying the rating by 24 hours a day.
Can I use an idle power reading to budget for a live stream?
You can use it as a clearly labelled reference point, but it does not show the draw of an active encoder. Test the stream configuration you plan to use, including any equipment that will remain on, and calculate from that average.
Which electricity rate should I use if I am in India?
Use the applicable rate and billing structure on your own electricity bill, including relevant per-unit charges and taxes. U.S. EIA averages are context for U.S. customers, not an Indian tariff or a substitute for your local bill.