What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
To estimate the electricity cost of running an AI model, first estimate the energy used in kilowatt-hours (kWh), then multiply it by the electricity rate that applies to the deployment. The arithmetic is straightforward; the important part is defining what the energy figure includes. A reading for a whole computer, an estimate for a cloud query, and a training-job total are different measurements, so there is no universal cost per AI prompt.
The basic electricity-cost formula
Electricity cost = energy consumed (kWh) × electricity price ($/kWh).
As an Amazon Associate I earn from qualifying purchases.
If you know average power and operating time, convert watts to kilowatts by dividing by 1,000, then multiply by hours. For a system averaging P watts for t hours, energy is (P ÷ 1,000) × t kWh. At a rate of r dollars per kWh, the estimated energy charge is (P ÷ 1,000) × t × r.
Free tools Windows power users keep installed
One-click scans. No signup required.
This estimates the electricity charge for the energy included in your measurement. It does not necessarily equal the complete bill, which can include fixed fees, taxes, demand charges, or time-varying prices.
#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
Estimate local AI use with a wall measurement
For a model running on your own computer, the most practical measurement is usually accumulated energy for the whole computer at the wall during a representative workload. A plug-in electricity usage monitor, such as a compatible P3 Kill A Watt power meter, can report watts and cumulative kWh. Check the selected meter’s outlet and load compatibility before using it.
A wall reading includes the computer’s other components and its idle draw; it does not isolate the model or identify which software process used the electricity. To estimate the additional energy associated with a workload, measure a baseline period and a representative inference period under similar conditions, then subtract the baseline. State whether you have made that subtraction.
Use accumulated energy over enough representative runs rather than relying on a brief watt reading. Include the parts of the workload relevant to your use case, such as warm-up, prompt processing, text generation, and any idle time you intend to count. Multiply the resulting kWh by your own electricity rate.
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
Estimate cloud inference without a meter on the server
When you send a request to a cloud model, you generally cannot measure the provider’s serving hardware at the wall. If the provider publishes an energy figure, check what workload, hardware, measurement boundary, method, and date it covers before applying it to your own usage.
If no suitable provider figure is available, a bottom-up estimate can use accelerator power and throughput for a specified input and output workload. Any estimate should identify assumptions about utilization and other server or facility loads where those are included. Avoid dividing a data-centre electricity total by a query count unless the workloads and allocation method are known.
A 2025 arXiv preprint models frontier-scale inference workloads on an H100 node and reports a median of 0.34 Wh per query, with an interquartile range of 0.18–0.67 Wh. In a test-time-scaling scenario with many more tokens, it reports a median of 4.32 Wh per query. These are outputs for the paper’s modeled deployments, not measured constants for every model or prompt. The difference illustrates why token volume, reasoning or agentic behavior, hardware, utilization, and serving efficiency matter. See the paper and its stated modeling assumptions.
Rank #3
- SAFETY YOU CAN TRUST WITH UL CERTIFICATION: With Emporia Energy, your home energy monitoring is safe, reliable, and certified. The Emporia Vue is UL Listed, meaning it has met rigorous safety standards for electrical products in the U.S. and Canada. This certification ensures that every component has been thoroughly tested to prevent hazards, such as overheating, short-circuiting, or fire, offering you peace of mind as you manage your home’s energy consumption.
- INSTALLS IN CIRCUIT PANEL of most homes with clamp-on sensors. Supports Single phase, Single-split phase, and 2-wire systems. 3-wire systems; 3-phase, 4-wire Wye systems with earthed (TN or TT) neutral (no-Delta) are supported with an additional 200A sensor (sold separately).
- 24/7 ENERGY MANAGEMENT AND MONITORING: Automate, manage and control your home's real power anywhere, anytime to prevent costly repairs, conserve energy, and save costs. Monitor solar / net metering. PROTECTED BY A 1-YEAR WARRANTY.
- LOWER YOUR ELECTRIC BILL: Configure settings in the Emporia Energy App to automate energy management for time of use, peak demand, excess solar, and rewards programs. You can even see live reporting and invaluable savings opportunities instantly. Gauge real-time spending and get actionable notifications and automated energy management to help you reduce costs.
- REAL-TIME ENERGY DATA: REQUIRES 2.4 GHz WIFI WITH AN INTERNET CONNECTION to monitor energy use with iPhone / Android / Web app. Vue sensors collect energy data and are accurate from ±2%. The Vue is UL and CE Listed for your safety. 1 second data is only available in the app (when actively open) and retained 3 hours. Minute and hour data are retained in the cloud. 1 minute data is retained 7 days, 1 hour data is retained indefinitely. Export cloud data whenever you want in the app.
Estimate training from the job’s energy boundary
A training estimate needs power over the job’s duration and a load factor that represents actual operation. Prefer job telemetry or whole-system energy measurements when available. If estimating from equipment specifications, distinguish accelerator power from total server and facility electricity.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →The International Energy Agency’s 2025 Energy and AI report describes a dataset-based method that multiplies maximum training power by estimated duration and an 84% load factor. Its method also scales GPU power to account for server equipment beyond the GPUs and adds a factor for non-IT load. These are elements of the report’s estimation approach, not default values for every training job. The IEA notes that AI model training and deployment occur mainly in data centres; its discussion of energy demand is available at Energy demand from AI.
Calculate fine-tuning as its own workload using its own runtime and energy data. Do not assign a foundation model’s training energy to each inference query unless you explain how that energy is allocated and across how many queries.
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
Decide whether data-centre overhead is included
Accelerator or server electricity is not automatically the same as total facility electricity. Data centres also use power for associated infrastructure. The IEA reports that servers account for around 60% of electricity demand in modern data centres on average, with variation by facility type.
For a facility-level estimate, use a documented power-usage-effectiveness (PUE) factor or another source-supported overhead method, and explain which loads it covers. Do not add PUE again if the energy figure already represents the whole facility. The IEA’s account of data-centre energy demand provides context for the distinction between server and broader facility use.
Results can differ with hardware, batch size, token volume, model behavior, utilization, idle draw, cooling, and facility design. The Lawrence Berkeley National Laboratory’s 2025 U.S. data-centre report uses a bottom-up model involving equipment shipments, per-device energy, cooling simulations, facility types, and locations, and includes sensitivity and compounded-uncertainty scenarios. Its national projections are not a conversion factor for an individual model or query; see the 2025 update.
Best Value
- ✓ 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.
Use a relevant electricity price
For your own local system, use the rate and pricing structure on your electricity bill or tariff. For context, the U.S. Energy Information Administration’s 2025 annual-average retail prices were:
| U.S. customer category | 2025 annual-average retail price |
|---|---|
| Residential | 17.30¢/kWh |
| Commercial | 13.41¢/kWh |
| Industrial | 8.62¢/kWh |
| All customer types | 13.63¢/kWh |
| State range, all customer types | 8.20¢–35.72¢/kWh |
These are national and state context figures, not substitutes for a specific customer’s tariff. EIA notes that local prices vary with factors including fuel availability and costs and pricing regulation. Check its explanation of electricity prices and electricity data for definitions and data.
A cloud provider’s electricity procurement cost is not necessarily the retail price a household pays. Do not use a residential average as a proxy for provider operating cost unless you explicitly intend only a rough illustrative calculation. Keep electricity cost separate from an API or subscription fee: the service price is not itself the electricity used.
Make comparisons on the same basis
To compare two models or a local setup with hosted service, estimate kWh for the same kind of task and use the same measurement boundary. Record the assumptions that can change the result:
- Input and output token counts or the task mix.
- Hardware, serving configuration, and utilization assumptions.
- Whether idle energy, non-GPU server equipment, and non-IT facility energy are included.
- The electricity price and geography used to convert kWh into cost.
Report estimated energy per comparable task separately from service fees. That makes clear whether a difference comes from electricity use, the rate applied, or the provider’s billed price.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
