To estimate the electricity cost of running an HP ProDesk 400 G4 Mini for a 24/7 YouTube stream, measure the average power of the setup at the wall and multiply its annual energy use by your electricity price per kWh. The model name alone cannot tell you what your particular streaming setup will draw.
HP’s published figures cover specific idle, sleep and off states, not YouTube playback. Use those figures as context only; for a useful bill estimate, take a representative measurement while your stream is actually running.
What this estimate can and cannot tell you
The calculation gives you an estimate of the electricity used by the equipment included in your measurement. It can tell you how the annual cost changes if the measured average is higher, or if your tariff changes. It does not predict the draw of every ProDesk 400 G4 Mini, or tell you what your electricity provider will bill without the correct rate and billing details.
A stream is a workload, not an idle state. Encoding, playback, network activity, attached equipment and power settings may all affect a system’s draw. The result also depends on what you measure: a meter reading for the Mini alone will not include a monitor or other devices plugged into a separate socket.
HP’s 2018 QuickSpecs list standardized energy figures for the ProDesk 400 G4 Desktop Mini in several operating states. The listed short-idle results are about 5.65–5.83 W and long-idle results about 5.39–5.47 W. Sleep is listed at about 0.63–0.69 W, and off at about 0.53–0.59 W. These are state-specific figures under the document’s ENERGY STAR test method and voltage conditions, not power measurements of a YouTube stream. HP also notes that configurations and availability vary by country. You can consult the HP QuickSpecs document for the model-family context.
An independent ServeTheHome review reported 10–11 W at idle for its tested quad-core unit. That is one review sample and an idle observation, not a result for your machine or a continuous streaming test. The difference between the review observation and HP’s standardized figures is a useful reminder that configuration and measurement conditions matter. The review’s power section gives its test context.
If you need to confirm which variant and components you own, start with HP’s ProDesk 400 G4 setup and user guides. Do not use a nearby published figure as a substitute for measuring a live stream. For broader choices about where to run a channel, the practical trade-offs in hosting a 24/7 temple stream from a VPS can help frame what you are comparing; it does not establish the electricity use of your Mini.
Measure the complete setup at the wall
A plug-in electricity usage meter is the straightforward way to get the wall-power figure for equipment connected through it. Put the meter between the wall socket and the equipment you want to count. If the question is “what does the computer cost to run?”, measure the Mini and its required power supply. If the question is “what does this streaming station cost?”, include the display and attached devices that stay on as part of that station.
Run the stream in its usual configuration while you measure. That means using the actual file or playlist, streaming software and settings you expect to leave in place. A reading taken while the machine is sitting at the desktop is not a streaming measurement. Nor is a brief peak necessarily representative of the average over a full day.
Allow the system to reach its normal operating pattern, then record the average watts if the meter provides it. Some meters instead accumulate energy in kWh over an interval. In that case, write down the start and end readings and the elapsed time, and make sure the interval reflects normal operation rather than a one-off setup or update period. Follow the meter’s own instructions; a meter’s display and precision vary by product, so no particular device is assumed here.
Keep the scope consistent. If you measure the PC, use the PC reading for the annual estimate and state that the display is excluded. If you use a power strip connected through the meter and include the monitor, router or audio equipment, label the result as the whole setup. That distinction matters when you compare one measurement with another or discuss the result with someone else.
For a channel assembled on a local computer, the Windows and OBS auto-start setup is relevant to the operating pattern you are measuring. A system that has to recover after a restart may not behave like one left untouched on a desktop. The electricity estimate still comes from the meter, not from the fact that a playlist or software is configured to launch automatically.
Convert average watts to annual kWh
For continuous operation across a 365-day year, the conversion is:
Annual kWh = average watts × 8.76
The factor comes from 24 hours per day multiplied by 365 days, then divided by 1,000 to convert watt-hours to kilowatt-hours. For example, multiply the average wall reading in watts by 8.76. A reading of 20 W would correspond to 175.2 kWh over that assumed year; this is just the arithmetic for that stated input, not a prediction for a ProDesk stream.
The same relationship can be used over a shorter measured period. If a meter reports kWh for a known interval, scale that energy to a full year only if the interval is representative and the equipment genuinely runs continuously in the same pattern. An overnight reading may omit daytime changes, scheduled reboots or a display that is turned off for part of the day. When the routine varies, measure a longer representative period or calculate separate periods rather than treating one convenient interval as the whole year.
The conversion assumes 8,760 operating hours. A leap year has an extra day, but for a practical estimate you can use the stated 365-day basis and revise it if you want the exact calendar period. More importantly, do not apply the continuous-use multiplier to equipment that is regularly shut down unless you adjust the hours or measure its actual energy over a representative period.
Apply your electricity rate
Once you have annual kWh, multiply by the price per kWh that applies to your usage:
Annual electricity cost = annual kWh × price per kWh
Use the unit rate on your current bill or tariff information, with the correct currency. For an Indian household, for example, the relevant amount may depend on the applicable tariff and billing category; use your own bill rather than assuming that a single price applies across states or consumers. If your bill separates energy charges from other charges, be clear about whether your estimate covers only electricity consumption or attempts to include the wider bill. This simple formula estimates energy cost from the rate you supply; it does not reproduce every line item on a bill.
The units must match. If your annual use is in kWh and your tariff is stated in rupees per kWh, the result is in rupees per year. If a rate is quoted in a different unit, convert it before multiplying. Keep the rate and date alongside the result because tariffs can change, and a cost estimate made with an old bill may no longer describe current spending.
A useful way to present the estimate is to retain all three inputs: measured average watts, annual kWh and the electricity rate. That makes the result reproducible. It also makes it easy to see whether a difference comes from your hardware measurement or from the rate, instead of attributing both to the computer model.
An illustrative 10 W calculation
Suppose a meter showed an average of 10 W for a particular setup during representative streaming, and suppose the electricity price were $0.15 per kWh. The annual energy would be 10 × 8.76, or 87.6 kWh. Multiplying 87.6 by $0.15 gives an illustrative annual energy cost of $13.14.
Those inputs are examples for demonstrating the arithmetic. They are not a claim that a ProDesk 400 G4 Mini draws 10 W while streaming, and $0.15/kWh is not a statement about your tariff. The review’s 10–11 W figure, for instance, was an idle reading on one tested quad-core machine. It should not be presented as the reader’s stream draw or substituted for an actual wall measurement.
You can replace both example inputs with your own values. If your measured average is 14 W, use 14 × 8.76 for annual kWh; then multiply that result by your own per-kWh rate. Keeping the steps visible is more useful than quoting a cost alone because another reader can see exactly which assumptions produced it.
Include the display and attached devices
A display can change the answer if it remains on while the stream runs. The Mini’s electricity use and the monitor’s use are separate loads, so a PC-only meter reading does not account for a monitor plugged into another socket. The same applies to speakers, an audio interface, a network switch or other equipment that you intend to include in the operating cost.
Decide first what question you are answering. For a hardware comparison, PC-only may be the cleanest scope. For a household electricity budget, measuring the equipment that stays on for the channel is more useful. If the router serves other household devices too, you may not want to assign its full consumption to the stream; state that choice rather than silently including or excluding it.
A simple table helps make the boundary explicit:
| Measurement scope | What to connect through the meter | What the result represents |
|---|---|---|
| Mini only | ProDesk power connection | The computer’s measured wall draw |
| Mini and display | ProDesk and display | The computer plus screen, if both stay on |
| Streaming station | The equipment you intend to count | The chosen group of devices, not necessarily the whole home network |
Do not add a second device’s wattage from a product label to a measured PC figure and call the sum a measured total. A label is not a measurement under your use. If the combined cost is important, meter the combined equipment together where practical, or take separate representative readings and describe the limits of the estimate.
If electricity is not the only operational concern, think about how a local machine behaves when the connection or software fails. The 3am failure checklist covers recovery questions for an always-on channel. If keeping a computer running at home is the specific burden you want to remove, StreamNeo takes an uploaded video and runs it as a YouTube live stream without your own computer staying on; it is YouTube-only, so that is a different operating arrangement rather than a lower wattage reading for the HP.
Recalculate when the workload or tariff changes
Repeat the measurement if you change the playback file, streaming settings, attached equipment or the way the computer operates. The aim is not to test every possible setting. It is to measure the configuration you intend to leave running and use the same scope and time basis when comparing results. If you change one thing at a time, it is easier to see what affected the measured average.
Likewise, revisit the cost when your electricity rate changes. The annual kWh can remain the same while the estimated cost changes because the tariff input is different. Keep the date of the bill or rate you used, and avoid carrying a one-time estimate forward indefinitely without checking whether either the setup or tariff has changed.
If the stream only runs for part of the year, or there are planned periods when the equipment is off, adjust the operating hours instead of using the full-year assumption. One option is to calculate kWh for each pattern separately, then add the results. Do not annualise a short interval that includes unusually heavy activity, a setup period or downtime and assume it represents every hour of the year.
The relevant comparison is often not simply one computer against another. Compare the measured average watts, the tariff, and what equipment was included. A low number for a Mini alone and a higher number for a full station may both be accurate if their measurement boundaries differ. If you are also considering a hosted setup, VPS pricing for a 24/7 YouTube livestream in India is a separate operating-cost question; compare the costs and responsibilities on a like-for-like basis rather than inferring household electricity use from a hosting price.
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 I use HP’s idle figure to calculate my stream’s electricity cost?
Not as though it were streaming power. HP’s QuickSpecs distinguish short idle, long idle, sleep and off states; none of those figures establishes the draw of your YouTube playback workload. Use a wall meter while your usual stream is running, then apply the cost calculation to that measurement.
Is 10 W a fair estimate for every ProDesk 400 G4 Mini?
No. The 10 W input in the example is there to show the arithmetic, while ServeTheHome’s 10–11 W observation was idle power for one tested quad-core unit. Your configuration and stream may produce a different average, so measure your own setup rather than treating either figure as a universal streaming rating.
Should I include my monitor in the calculation?
Include it if it remains on and you want the estimate to represent the full streaming station. If you only want the Mini’s cost, measure the Mini alone and label the result accordingly. Be consistent about whether peripherals and shared network equipment are included.
What if my bill does not show one simple electricity price?
Use the rate that applies to the consumption you are estimating and note what the calculation leaves out. A per-kWh multiplication gives an energy-cost estimate, not necessarily every charge, tax or adjustment on a bill. Check your current bill or tariff information for the applicable terms.