Measure the computer at the wall while it runs the streaming workload you actually plan to use. A plug-in electricity meter that reports true power and accumulated kilowatt-hours (kWh) can show the average draw; then multiply that average by the hours you expect to stream and apply your electricity rate. A power-supply rating or one momentary watt reading cannot tell you the PC’s representative consumption during a fluctuating stream.
What to measure before calculating cost
First decide what your estimate covers. A meter measures only the devices connected downstream of it, so a PC-only figure excludes any monitor, router, capture hardware, audio equipment or lighting that is not included in the measured setup. Either measure those devices too or list them separately. Record the boundary so you do not later compare a PC-only result with a whole-setup result.
The power-supply rating describes a rated capacity, not the computer’s measured AC draw during your stream. For a useful estimate, measure the actual computer and settings at the AC input.
How to measure the PC’s real draw
- Choose a suitable plug-in electricity meter. Look for true-power measurement in watts (W), accumulated energy in kWh, or an average-power function. Check that the meter suits your local outlet and voltage, has adequate resolution for the load, and is rated for the computer and any other connected equipment. Follow its instructions and maximum-load rating. No particular consumer meter model is established here as a tested recommendation.
- Connect it at the wall. Put the meter between the mains outlet and the measured device or setup. The EPA/ENERGY STAR Version 4.0 computer test procedure describes direct AC-input measurement without an intervening power strip or UPS. That is a legacy laboratory protocol, not a universal instruction for every home setup; for a real-world measurement, follow the meter’s directions and electrical ratings.
- Run the real streaming workload. Use the software, encoder, output settings, scene, game or media, and other normal conditions you intend to use. Let startup or one-off background activity settle if it is not part of ordinary operation. Record important settings and whether a display or peripherals were included. The sources do not establish a tested YouTube PC configuration or a typical streaming wattage.
- Measure for a representative interval. If the draw fluctuates, use the meter’s accumulated kWh over a timed interval and divide that energy by elapsed hours to find average power, or use its average-watts function. DOE’s summary of IEC 62301 says stable power varies by less than 5% from the mean over five minutes; otherwise, measure energy over time and divide by the measurement period. This is useful measurement guidance, not a guarantee that five minutes characterizes every stream.
- Record the result and conditions. Note average watts, accumulated kWh, the observation duration, which devices were measured, the workload and settings, and the date. If you stream different scenes, games or configurations, measure and label them separately.
DOE FEMP’s “Measuring Standby Power” gives examples of instrument resolution for low-power measurements: 0.01 W or better below 10 W, and 0.1 W or better from above 10 W through 100 W. Those are examples in its summary of IEC 62301 standby-power measurement requirements, not specifications for every PC meter or load. See DOE FEMP’s measurement guidance.
#1 Best Overall
- Various Monitoring Parameters: The power meter plug can monitor the power (W), energy (kWh), volts, amps, hertz, power factor, cost, minimum and maximum power (W), cumulative days and time of your appliances. By switching 7 display modes, you can easily know the various parameters while the appliance is working. The home energy monitor can also calculate and display how much power your appliance uses and how much electricity bill it cost in cumulative time
- Upgraded LCD Display: With large screen size 2.36 inch x 1.85 inch, clearer monitor backlit, our electrical usage monitor can display the data clearer and more visible no matter day or night. 180°full wide viewing angles is great for reading and recording the data in any angles. No need to stand on the front of the display and bend over to read the numbers
- Adjustable Backlight Time: Our upgraded watt meter has 5 options of backlight time. The default backlight time duration is 10 minutes(bL-0). If you want to change the backlight time, you can press and hold "UP" and "DOWN" button at the same time to enter backlight time setting, then press "UP" and "DOWN" to select the backlight time (bL-0 =10 minutes, bL-1=1 hour, bL-2=4 hours, bL-3=8 hours, bL-4=always on), finally press the "COST" to save the backlight time settings
- Overload protection: When the power of the appliance exceeds the overload power, the LCD will display “OVERLOAD” to warn the user. All the buttons will quit working and can only be workable when you lower or remove the load power. The default overload power is 3680W and is adjustable from 0 to 3680W. In general, you need to set the overload power to 1800W before using. Just press the "function" button for more than 3 seconds to enter the setting
- Data Memory Function: The wattage meter will record your power consumption data when you remove it from socket, or remove appliances from the electricity monitor. You can directly see the last data when you use it next time. This function can also automatically save the data when there is a sudden power failure
Turn the measurement into an electricity estimate
Use the average draw, not a peak or isolated snapshot:
Energy (kWh) = (average power in W ÷ 1,000) × operating hours
Rank #2
- Multi-function power monitor: Our electric usage monitor can monitor the power (W), electricity(kWh), voltage(V), frequency(Hz), current(A), power factor(PF), unit price($/kWh), total cost($) of your appliances. By switching 8 display modes, you can easily know the various parameters while the appliance is working. The “electricity” mode can calculate and display how much power your appliance uses. And the “total cost” mode will show how much electricity bill it cost in cumulative time
- Overload protection: When the loading power of the appliance is over the default overload threshold 1800W, the whole display with backlight and the word “OVERLOAD” will keep flashing to warn the users. Please turn off the appliance for safety concern
- Premium Material: The whole body of our energy meter is made of high-quality ABS material. It makes our home electricity usage monitor more long lasting, fireproof and anti-drop. The standard US socket and plug is suitable for all US standard appliances
- Backlight Display: With white backlight and black words, the LCD display of our home power monitor can display the data clearer and help you to read the data easier no matter day or night. The backlight will only lights up when the device is connected to AC power. If no button is pressed, the backlight turns off automatically after 10 minutes. You can also press the "UP" button to turn off the backlight manually, and press any button to turn on backlight again
- Easy to reset: No reset tool needed, our appliance power usage meter is easy to reset. You can press the “M” button for 5 seconds directly to reset the device. After reset, all cumulative data (electricity quantity, cost) will be cleared, and all settings will be restored to factory settings
Then calculate:
Estimated energy cost = kWh × your applicable electricity price per kWh
For example, if your meter records an average of W watts for H hours, the estimate is (W ÷ 1,000) × H × your rate. Insert your own measured watts, planned hours and local tariff rather than assuming a generic PC draw or national electricity price. DOE-hosted educational material presents the energy relationship as “kWh = kW x hrs” and advises using the local electricity price. A tiered bill can make a single per-kWh rate less straightforward; time-of-use periods, fixed charges, taxes and other adjustments can also affect the final bill. See DOE’s cost-calculation material.
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Rank #3
- ✓ Backlit LCD Display: The watt meter features an upgraded backlit LCD display with a 160° wide viewing angle, providing clear and distinct data readings from any angle, day or night. (Note: To conserve energy, the backlight will automatically turn off after 15 seconds of continuous use.)
- ✓ 9 Types of Data Display: This energy meter plug accurately monitors a wide range of electrical parameters, including power (W), apparent power (VA), energy consumption (kWh), usage time (hours), power frequency (Hz), power factor (PF), voltage (V), current (A), and electricity cost. The user-friendly interface allows you to easily read and navigate through 9 types of data with a single button.
- ✓ Save Money and Energy: By toggling through the 9 display modes, you can gain insights into various operational parameters of your devices. The home energy monitor also calculates and displays the electricity consumption and cost over time, helping you save on your electricity bills by monitoring and managing energy usage.
- ✓ Data Storage: The plug-in electricity meter stores all non-real-time data, ensuring no information is lost in the event of a sudden power outage. If data exceeds the screen’s maximum display range, the screen will flash as a reminder. Pressing and holding the reset button for 3 seconds will reset the cumulative data to zero.
- ✓ Safe to Use: Rated voltage 125VAC, 60Hz, 15A maximum 1875W resistor and tungsten wire, 1/2HP. Clean and tidy interface, very simple to use.
Estimate a continuous year
A continuous schedule across an ordinary 365-day year is 8,760 hours (24 × 365). For that assumed schedule, annual energy is average watts × 8.76 kWh per watt-year; multiply the result by your applicable rate for a simple cost estimate. This is calendar arithmetic, not a claim about a PC’s measured draw. For downtime, a shorter schedule or a leap year, use the actual operating-hour total.
How to compare measurements or meters fairly
Compare PC setups only when their workload, settings, run duration and included devices are comparable. Use average draw or energy over the same duration, not one setup’s peak reading against another’s average. Apply the same local tariff when comparing estimated costs.
Rank #4
- Various Monitoring Parameters: The power meter plug can monitor the power (W), energy (kWh), volts, amps, hertz, power factor, cost, minimum and maximum power (W), cumulative days and time of your appliances. By switching 7 display modes, you can easily know the various parameters while the appliance is working. The home energy monitor can also calculate and display how much power your appliance uses and how much electricity bill it cost in cumulative time
- Upgraded LCD display: With large screen size 2.36 inch x 1.85 inch, clearer monitor backlit, our electrical usage monitor can display the data clearer and more visible no matter day or night. 180°full wide viewing angles is great for reading and recording the data in any angles. No need to stand on the front of the display and bend over to read the numbers
- Adjustable Backlight Time: Our upgraded watt meter has 5 options of backlight time. The default backlight time duration is 10 minutes(bL-0). If you want to change the backlight time, you can press and hold "UP" and "DOWN" button at the same time to enter backlight time setting, then press "UP" and "DOWN" to select the backlight time (bL-0 =10 minutes, bL-1=1 hour, bL-2=4 hours, bL-3=8 hours, bL-4=always on), finally press the "COST" to save the backlight time settings
- Overload protection: When the power of the appliance exceeds the overload power, the LCD will display “OVERLOAD” to warn the user. All the buttons will quit working and can only be workable when you lower or remove the load power. The default overload power is 3680W and is adjustable from 0 to 3680W. In general, you need to set the overload power to 1800W before using. Just press the "function" button for more than 3 seconds to enter the setting
- Data Memory Function: The wattage meter will record your power consumption data when you remove it from socket, or remove appliances from the electricity monitor. You can directly see the last data when you use it next time. This function can also automatically save the data when there is a sudden power failure
When choosing between meters, compare true-power measurement, accumulated energy or averaging, useful resolution at the expected load, outlet and voltage compatibility, and rated load. Check the manufacturer’s limits before connecting a high-load setup. The official sources explain measurement principles; they do not endorse a consumer model or establish that a particular meter is safe for every configuration.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What official efficiency information can—and cannot—tell you
The EPA/ENERGY STAR computer procedure cited here is Version 4.0, a legacy test procedure for specified standby, sleep and idle measurements. It illustrates AC-input measurement and averaging methods; it is not the current ENERGY STAR certification rule and does not predict a creator’s live-stream consumption. ENERGY STAR’s current Computers page covers desktops, integrated desktops, notebooks, tablets, thin clients and workstations, and identifies criteria effective October 2025. Certification criteria and controlled idle tests are not substitutes for measuring your own stream workload. The legacy procedure is available at EPA/ENERGY STAR’s Version 4.0 computer test procedure.
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Or let it run in the cloud
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