There is no single reliable wattage for a desktop PC running an OBS loop stream. To estimate your electricity use, measure the complete setup at the wall during a representative run, convert that measurement to kilowatt-hours, then apply the rate on your own electricity plan.
A CPU or GPU utilisation figure is not a whole-system power reading, and a component’s rated maximum is not a bill estimate. The practical answer comes from your particular PC, scene, settings and runtime.
Why there is no single wattage answer
OBS is software running on a particular combination of processor, graphics hardware, memory, storage and connected equipment. A stream that displays a still image may ask different things of that system than a video loop with animated browser overlays. Even when two people select similar output settings, their computers and scenes are not necessarily alike.
The OBS Project’s system requirements explain that CPU demands vary with encoder, resolution, frame rate and scene complexity. Those are useful clues about workload, but they are not a published wattage range for a desktop running a loop stream. The OBS overview describes the software’s role in combining and producing scenes; it does not provide a standard electricity figure for your whole PC.
It helps to separate power from energy. Power is the rate at which a system draws electricity at a particular moment, commonly expressed in watts. Energy is the amount used over a period, expressed on household bills in kilowatt-hours (kWh). A fluctuating power draw needs to be considered over time to estimate the energy consumed during a night or a longer broadcast.
That is why a number borrowed from another creator is a weak basis for your bill. Their hardware, output settings, background tasks and connected devices may differ. A plug-in electricity usage monitor that records energy is one way to get a number for your own setup; check that the device is suitable for the electrical supply and load you intend to measure.
What changes the OBS workload
OBS workload can change with the encoder, output resolution, frame rate and scene complexity. A higher-resolution or higher-frame-rate output asks the system to process more picture information, while more elaborate scenes can require additional work to compose and render. These relationships help explain why workload varies; they do not tell you exactly how many watts a particular change will add.
The encoder matters, too. OBS’s guidance on hardware encoding generally recommends using a hardware encoder for performance because it transfers encoding work from the CPU to a specialised component in the GPU. That describes where some work happens. It does not prove that a hardware encoder always reduces total electricity at the wall: the rest of the system is still running, and the result depends on the actual equipment and job.
Your loop content and scene sources also matter. A static devotional image with a title may have a different workload from a moving video, animated visualisation, browser source or several changing overlays. A scene that looks nearly still to a viewer can still contain a source that updates in the background. If you use several scenes, transitions or additional programmes alongside OBS, include those in the test when they will normally be running.
If the PC is also doing other work, the meter records that too. A browser left open, local file playback, a scheduled backup or a second application can contribute to the total. That does not make the measurement useless: it makes it an estimate of the setup you actually intend to leave on. For an OBS-only comparison, close unrelated tasks consistently during both tests.
Measure the complete setup at the wall
Use an outlet-based electricity monitor that can measure energy over time or report average power. Put it between the wall outlet and the desktop’s AC input, following the monitor’s instructions. This captures the desktop as a whole rather than just a processor or graphics card. Do not exceed the monitor’s rating, and avoid improvised electrical connections.
Be clear about what you want to know. If the question is the electricity used by the PC, measure the desktop tower. If you want the cost of keeping the entire workstation operating, include the display and any other equipment that will remain switched on. Measure those items through a suitable setup and record exactly what was included. A tower-only figure should not be presented as the cost of a tower, monitor, router and speakers combined.
Some monitors show watts at a moment in time; others accumulate energy in kWh or watt-hours. A momentary display can move up and down as the workload changes. The U.S. Department of Energy’s Federal Energy Management Program guidance says fluctuating power should be measured over a period, then divided by that period to determine average power. For this purpose, an accumulated energy reading is often the simplest: note the starting value, run the test, then note the ending value.
Keep the measurement method consistent. Use the same outlet monitor, same set of connected equipment and same OBS configuration when comparing runs. Record whether the display was included and which other devices were left on. If you want to distinguish idle PC consumption from streaming consumption, take a separate baseline with the PC in its usual idle state, then compare it with the stream run over comparable periods. The difference can help describe the extra energy associated with the streaming workload, while the full stream reading remains the relevant figure for the complete bill estimate.
A wall measurement can also show you the practical trade-off between keeping your own desktop on and using another workflow. For a broader comparison of operating approaches, see cloud service versus home PC costs for an always-on ambient stream. Keep the assumptions visible: the PC-only reading and the cost of a complete workstation are different questions.
Choose a representative loop-stream test
A useful test resembles the broadcast you plan to run overnight, not an empty OBS project or a short burst after launching the programme. Load the actual loop file, scenes, overlays and sources. Select the encoder, output resolution and frame rate you expect to use, then start the stream if streaming itself is part of the normal setup. Let the computer reach its normal operating state before you begin recording the measurement.
There is no universal test duration that suits every loop. The interval should be long enough to include ordinary variations in your content and activity. If the loop contains a quiet still section followed by a video or animated section, include both. If a browser source updates periodically, let the test cover that behaviour. A reading from one moment may miss these changes.
Note conditions that might change the result: room conditions, whether the display is on, other programmes, and any scheduled jobs. You do not need a laboratory log. A short note with date, PC components, OBS version if useful, encoder, resolution, frame rate, scene sources, included peripherals and test interval makes your result interpretable later.
For a fair comparison between two settings, keep the loop content, equipment and duration the same. Change one meaningful setting at a time where possible, then record both energy and whether the stream remained stable and looked acceptable. OBS’s encoding performance troubleshooting guide discusses reducing output resolution or frame rate and simplifying scenes when GPU resources are constrained. Those adjustments may help performance, but the guide does not quantify their electricity effect; measure each configuration rather than assuming a fixed saving.
If your real use is a 24/7 broadcast, consider testing a representative portion of the day and noting periods when other work tends to occur. A short controlled comparison is useful for comparing settings, but it should not be mistaken for a full-day measurement if your workload changes through the day. When the system is left unattended, stability and recovery matter alongside energy use. This guide to keeping viewers when restarting OBS covers that separate operational concern.
Convert power and runtime into kWh
If the monitor records energy directly, subtract the start reading from the end reading. For example, if its kWh display moves from one value to a later value, the difference is the energy used during that interval by the equipment connected to it. Check whether the display is in kWh or watt-hours before doing the subtraction, and use matching units for both readings.
If the monitor gives average watts for the test, use this conversion:
kWh = average watts × hours ÷ 1,000
The U.S. Department of Energy’s energy lesson explains the relationship between power, time and energy, including converting watt-hours to kWh by dividing by 1,000. For instance, you would multiply your measured average watts by the number of hours in your intended run, then divide by 1,000. The formula is a unit conversion, not a claim about what any particular desktop draws.
Be careful not to substitute a brief peak or an instant reading for average watts across the interval. If your display only reports an instantaneous watt figure, take repeated readings across a representative run or use a monitor that accumulates energy. Multiplying one moment’s reading by a full night assumes the draw stayed constant, which may not reflect OBS, the loop or background activity.
If your measured interval differs from the runtime you want to estimate, state the scaling assumption. For a workload that stays similar, you can use average power over the test interval to estimate energy over a longer runtime. If the PC behaves differently at other times, a direct longer measurement is better. Record the measured period separately from any extrapolation so you do not confuse an estimate with a meter reading.
Apply your electricity rate
Once you have kWh, multiply it by the applicable price per kWh on your own electricity plan. The basic estimate is cost = measured kWh × price per kWh. Use the rate and billing units shown on your current bill or plan, and check whether the price you are using is the relevant marginal energy rate for the extra consumption.
A bill can include fixed charges, taxes, tiered rates, time-of-use periods or other adjustments. A simple multiplication estimates the energy charge at the chosen rate; it may not reproduce the whole bill. If your rate changes by time of day, match the measurement or estimate to the periods when the PC will run. If you are unsure which line applies, check with your electricity supplier or the official tariff information for your area rather than borrowing a rate from another household.
For a monthly estimate, use your measured energy for a representative day or interval and scale it only if the schedule and workload are genuinely similar. State the assumptions: how many hours you intend to stream, whether the display stays on, and whether other equipment is included. A tower-only estimate at one rate is not a universal monthly cost for every always-on channel.
This measured approach is more useful than comparing bills from people with different tariffs and PCs. If you are also deciding how to deliver the loop, first establish what your home setup actually uses; then compare like with like. The guide to streaming a video file to YouTube Live without OBS explains an alternative workflow, but any electricity comparison still needs measurements and clearly stated assumptions.
Why utilisation and rated limits are not bill estimates
Task Manager, OBS statistics and GPU utilities may show CPU or GPU utilisation. These values describe activity relative to a component’s capacity, not the total watts drawn by the desktop at the wall. A GPU reading does not include the processor, motherboard, memory, storage, fans, power-conversion losses or connected display. Nor does a percentage directly convert into kWh.
A component’s rated maximum is not the same as what the complete desktop consumes during your stream. It may describe a limit or a specific component, not the changing draw of the whole system in your use. Adding component ratings together, or multiplying a rated value by runtime, does not give a defensible estimate of your household energy use.
Utilisation is still useful as a diagnostic. If OBS reports rendering or encoding strain, or a component remains heavily loaded, that can prompt you to simplify a scene or review settings. OBS’s troubleshooting guidance can help identify workload issues. But treat utilisation as context for interpreting your test, not a substitute for the meter.
If you compare software encoders or output settings, measure wall energy for each configuration over equivalent intervals. Record whether output quality and stability were acceptable as well as the measured kWh. A configuration that lowers one component’s utilisation is not automatically the lower-energy choice for the complete PC, and a short test cannot promise the same result in every scene or over every night.
For some operators, the underlying concern is not only electricity but also leaving a home PC responsible for a continuous broadcast. StreamNeo removes the need to keep your own computer running for the broadcast by turning an uploaded video into a YouTube live stream; it does not answer what your present desktop consumes, so use a wall measurement for that question.
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 can I tell how much electricity OBS uses?
OBS has no single electricity figure that applies to every desktop or loop. Measure the complete setup at the wall while running your actual scene and settings, then use the meter’s accumulated energy reading or convert average watts and runtime to kWh.
Can CPU or GPU usage tell me my electricity cost?
No. Utilisation describes activity of a component, not whole-system power over time, and it does not include your tariff. Use it to understand workload, then measure kWh and apply the rate on your own plan.
Should I include my monitor in the reading?
Include it if you want to estimate the cost of the whole workstation and it will remain on during the stream. If you want the desktop tower alone, measure only the tower and label the result accordingly.
How do I estimate the cost of leaving the loop on overnight?
Measure a representative run, calculate or record its kWh, and multiply by the applicable electricity rate. If you scale a shorter test to an overnight runtime, note that this assumes the workload stays similar; measure a longer interval if the scene or background activity varies substantially.