The electricity cost of a Mac mini running a 24/7 YouTube loop depends on its average power draw during that loop and the price you pay for each additional kilowatt-hour (kWh). Apple publishes idle and maximum figures for selected configurations, but neither is a measured YouTube playback average.
For a useful estimate, measure the complete setup at the wall while the loop is running, then multiply its average watts by the hours you stream and your marginal electricity rate. If you cannot measure it yet, Apple’s figures and the hypothetical examples below show how to do the arithmetic without mistaking reference conditions for a prediction.
What determines a Mac mini loop stream’s electricity cost
The basic calculation has two parts: how much energy the running setup uses and what your electricity supplier charges for that added energy. A Mac mini’s draw can vary with the model, the work it is doing, and what is connected to it. The bill estimate can also vary with tariff structure and the hours the stream runs.
A 24/7 loop is not the same workload as Finder sitting open, a computer asleep, or a processor running a demanding test. The Mac may be reading and playing a file, maintaining an outgoing live broadcast, and driving a display if one is attached. Browser or playback choice, video format and resolution may also affect the actual workload. Research notes do not provide a reproducible average for any particular combination, so this article does not assign one.
Be clear about what you want to cost. If you only want the Mac mini’s contribution, measure the Mac mini alone. If the stream relies on a display, USB devices, or other equipment plugged into the same measurement point, include them and call the result the complete setup. Network equipment can be measured separately if it is not on that point; include its consumption only if you intend to count it in the estimate.
The method works for a devotional playlist, lofi station, ambience loop or local news stream. The content changes what is played, but the cost calculation still uses the measured average wall watts and the applicable price per kWh. For a comparison of a different always-on computer setup, see how a 24/7 streaming PC may affect an electricity bill in a rented flat in India. Its context is not a substitute for measuring your Mac mini, but the household-bill question is closely related.
Apple’s idle and maximum figures are reference points
Apple’s power table gives reference readings for named Mac mini configurations. Its current table, published September 22, 2026, lists the M6 configuration with 16 GB of unified memory and a 256 GB SSD at 4 W idle and 70 W maximum. For the 2024 M4 configuration with 16 GB and a 256 GB SSD, the listed values are 4 W idle and 65 W maximum. These are useful points of comparison, not measurements of an active YouTube loop.
The condition behind a figure matters as much as the number. Apple defines idle as power used with only Finder open and default power management settings. A Mac maintaining a live stream is doing something else. Apple describes CPU Max as a compute-intensive test that maximises processor use and power consumption. A maximum or CPU-maximum reading is likewise not a playback forecast.
| Mac mini configuration in Apple’s table | Published idle | Published maximum | How to interpret it |
|---|---|---|---|
| M6, 16 GB / 256 GB | 4 W | 70 W | Reference for the stated configuration; not a YouTube-loop average. |
| M5 Pro, 64 GB / 8 TB | 6 W | 145 W | Higher-end configuration; maximum is not an expected stream draw. |
| 2024 M4, 16 GB / 256 GB | 4 W | 65 W | Finder-only idle and maximum reference, not playback. |
| 2024 M4 Pro, 64 GB / 8 TB | 5 W | 140 W | Apple-listed reference conditions only. |
| 2023 M2, 24 GB / 2 TB | 7 W | 50 W CPU maximum | Apple labels the maximum specifically as CPU maximum. |
| M1 (2020), 16 GB / 2 TB | 6.8 W | 39 W CPU maximum | An older-model reference; not loop-stream consumption. |
These readings are measured from the wall and include power-supply and system losses, according to Apple’s Mac mini power consumption and thermal output information. That means there is no need to add an arbitrary conversion or power-supply efficiency correction to Apple’s figures. It does not mean the reading covers your display, router or other equipment, unless those devices were also part of the measurement.
ENERGY STAR records for M4 models provide another useful example of why test conditions must stay attached to numbers. Its listed M4 states include long idle, short idle, sleep and off; those states are not active playback. Do not substitute a certification state for the wattage of a running broadcast. See ENERGY STAR’s certified products directory for current product records, and check the record that matches a configuration if you are comparing certified state data.
Measure the complete running setup at the wall
A plug-in electricity usage monitor can show instantaneous watts and, depending on the model, accumulated energy over time. Put the Mac mini’s power lead through the meter and run the actual loop as you expect to operate it. If the display or accessories are part of the question, arrange the measurement so they are included as well. Make a note of what is connected, because that makes a later comparison meaningful.
A brief reading just after starting is a weak basis for an annual estimate. Allow the setup to reach its ordinary running state, then record either the average watts over a representative interval or accumulated kWh over that interval. If the monitor reports only changing instantaneous wattage, take readings across the period rather than choosing the most convenient low point. For a better average, include periods when the loop runs normally and avoid deliberately changing the video or display state in the middle of measurement.
Compare like with like. If you are comparing two Mac minis, keep the same file, playback software, resolution, display status and attached equipment. If one test includes a display and the other does not, the difference cannot be attributed to the computer alone. The same applies to network equipment: either include it in both setups or exclude it from both.
A wall measurement answers a practical question that published specifications cannot: what does this particular setup draw during this particular loop? It is still an estimate of future use. If your stream sometimes changes resolution, runs different content, or has a display switched on only during maintenance, record those operating patterns and decide whether one representative average is sufficient or whether you need separate measurements for distinct modes.
If you are troubleshooting rather than just costing the stream, keep the two questions separate. For example, checks for dropped frames in an OBS stream using NVENC address GPU load and delivery symptoms; a watt reading does not by itself establish why frames are dropping. Similarly, a stable electricity estimate does not prove a stable stream.
Convert average watts to monthly or annual kWh
Once you have a representative average in watts, convert it to energy. A watt is a rate of power use; a kilowatt-hour is an amount of energy used over time. Divide watts by 1,000 to get kilowatts, then multiply by the hours the equipment runs.
For a system running continuously, use these calculations:
- Daily energy (kWh) = average watts × 24 ÷ 1,000.
- Annual energy (kWh) = average watts × 8,760 ÷ 1,000, using 365 days.
- Monthly average energy = annual energy ÷ 12.
The monthly figure here is an annual average divided by twelve, not a promise that every calendar month has the same number of operating hours. If the channel runs for fewer than 24 hours a day, replace 24 with its actual daily hours for the daily calculation. For an annual estimate, multiply the average watts by the total expected running hours in the year, then divide by 1,000.
For example, if your meter shows a steady average of 20 W for a setup that runs all day, daily energy is 20 × 24 ÷ 1,000, or 0.48 kWh. Annual energy is 20 × 8,760 ÷ 1,000, or 175.2 kWh. Those numbers show the conversion only; 20 W is an illustrative input, not a claimed measurement for a Mac mini stream.
If your meter reports cumulative energy directly, use the measured kWh over the interval and scale it to your expected operating time. That can be simpler than averaging fluctuating watt readings. Keep enough detail to remember whether the display and other equipment were included, and use the same boundary when applying the tariff.
Apply your electricity tariff
Multiply the calculated kWh by the marginal electricity price that best represents the extra consumption. The marginal price is the cost associated with adding those units, rather than necessarily the average total on your bill. If the bill uses time-of-use rates, tiered blocks, or another structure, the cost of added consumption may depend on when it is used and which tier applies.
A bill can include fixed charges, taxes and other items that do not rise in direct proportion to each additional kWh. Do not treat the full bill divided by total household kWh as a perfect marginal rate if fixed charges are a substantial part of it. For a rough estimate, use the per-unit rate that applies to the added consumption; for a more exact bill projection, account for the applicable tariff rules and time periods.
If your tariff is in rupees per kWh, calculate with that rate and keep the result in rupees. The hypothetical dollar example later is only there to demonstrate arithmetic and does not represent an Indian tariff or a universal price. Check the current rate on your own electricity bill or supplier’s tariff information. The calculation is only as specific as the price input you choose.
Read the hypothetical $0.15/kWh examples correctly
The following examples apply a hypothetical rate of $0.15 per kWh to Apple’s published M6 figures. They are not estimates of what a typical stream uses, and the assumed rate is not a national or local average. Their purpose is to make the formula visible and to show the consequences of using very different wattage inputs.
| Wattage input | Daily energy | Annual energy | Approx. monthly charge | Annual charge |
|---|---|---|---|---|
| 4 W idle reference | 0.096 kWh | 35.04 kWh | $0.44 | $5.26 |
| 70 W maximum reference | 1.68 kWh | 613.2 kWh | $7.67 | $91.98 |
The 4 W row takes Apple’s Finder-only idle reference and extends it mathematically across continuous operation. It does not say a YouTube loop will draw 4 W. The 70 W row does the same with Apple’s maximum reference; it does not say the loop will use maximum power, or that this is a likely playback condition. Treat both as arithmetic illustrations tied to stated reference figures.
To verify the first row, multiply 4 W by 24 hours and divide by 1,000 to get 0.096 kWh per day. Multiply by 365 days for 35.04 kWh per year, then by $0.15 to get $5.256, rounded to $5.26. Dividing the annual charge by twelve gives about $0.44 per month. The other row uses the same steps with 70 W. Rounding explains why a monthly average multiplied by twelve may not match the annual charge to the cent.
The energy figures in the table cover only the stated wattage input. They do not include a separately powered display, router or other equipment. Apple’s own published watt figures already account for system and power-supply losses, so adding an extra efficiency factor would count something that is already included in those readings. For an actual cost, replace the reference wattage and hypothetical tariff with your measured average and the marginal rate on your bill.
Estimate your own loop-stream cost
A simple record is enough to make the estimate auditable. Write down the Mac mini model, what equipment was included, the loop and playback conditions, the measured average watts or interval kWh, and the price per kWh you used. That way, if the stream setup changes, you can see which input needs to be checked again rather than relying on an old bill estimate.
Use the result as an energy charge estimate, not as a complete prediction of a household bill. Fixed charges, taxes and tariff tiers can change the final amount. If the loop is not actually running every hour of the year, adjust the operating hours; do not annualise a continuous schedule merely because the channel is described as 24/7 if you routinely stop it for maintenance.
The estimate also does not answer whether a local computer is the best operating arrangement for your channel. It simply makes the electricity component visible. If your present approach depends on leaving a computer running, the comparison of OBS and FFmpeg for a nonstop sleep-ambience stream can help frame playback-software trade-offs, while a separate wall measurement still tells you the energy cost of the hardware you actually use.
For a loop that must continue while your own computer is switched off, StreamNeo removes the specific burden of keeping that computer powered for the broadcast: you upload the video and provide the YouTube stream key, and the service runs the stream. It is YouTube-only, so this does not change the arithmetic for a Mac mini you choose to operate or establish what any particular setup will cost.
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
Does a Mac mini use 4 W while streaming YouTube?
Apple’s 4 W figure applies to the listed M6 and 2024 M4 configurations under its defined idle condition, with Finder open and default power management. Apple does not publish a YouTube playback average, so you should not use 4 W as a measured stream draw. Measure the running setup at the wall for a personal estimate.
Is Apple’s maximum power figure a realistic 24/7 estimate?
It is a published reference for a stated maximum condition, not a prediction of the power used by a loop stream. Apple’s CPU-maximum figures are specifically associated with a compute-intensive test, rather than ordinary playback. Use the maximum to understand a reference point, not to forecast your bill.
Should I include my monitor and router?
Include equipment if you want the cost of the complete setup and if it is operating because of the stream. Measure the same equipment consistently when comparing setups; if your question is only the Mac mini’s draw, measure it separately. A router shared with the rest of the household may be more useful to track separately than to attribute wholly to the channel.
How do I estimate the cost in my local currency?
Multiply your measured kWh by the marginal per-unit rate from your current electricity tariff, keeping the units in your local currency. If your supplier uses time-based rates or tiers, use the rate that applies to the added consumption and hours in question. The $0.15/kWh figures above are hypothetical arithmetic examples, not a universal tariff.