10 Best Kill A Watt of 2025

Tested and Reviewed: Top 10 Kill A Watt deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

Editor's Choice

9.7

MECHEER

Upgraded Watt Power Meter Plug Home Electrical Usage Monitor Consumption, Energy Voltage Amps Kill Tester with Backlight, Overload Protection, 7 Modes Display

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Editor's bottom line:

“This kill a watt is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

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
Monitor Your Energy UsageOur watt meter power analyzer lets you track electricity consumption and manage power usage to help save on bills. It works as a voltage, kilowatt, current, and electricity meter. If you have any questions about your meter socket, feel free to contact us

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Picked by 397 people today

9.5

P3

P3 International P4460 Kill A Watt EZ Electricity Usage Monitor , grey

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Main Highlights

Calculates cost and forecasts by week, month, and year
Displays eight critical units of measure on the large LCD display
Built-in backup of accumulated information.
Accurate within 0.2%
Calculates cost and forecasts by week, month and year

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9.5

MECHEER

Upgraded Watt Meter Power Meter Plug Home Energy Monitor Electricity Usage Monitor, Electrical Usage Monitor, Energy Voltage Amps Meter Tester with Backlight, Overload Protection, 8 Display Modes

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Main Highlights

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
Data Memory Function: The watt meter plug in will record your power consumption data when you remove it from socket, or remove appliances from the electricity monitor. All setting data and cumulative data(electricity quantity, cost, unit price) will be saved. You can directly see the last data when you use it next time(NOT including current, voltage, power, power factors). This function can also automatically save the data when there is a sudden power failure

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9.2

P3

P3 P4400 Kill A Watt Electricity Usage Monitor

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Main Highlights

Choose from the Kill-a-Watt's four settings to monitor your electrical usage
Monitor your electrical usage by day, week, month, or year
Features easy-to-read screen
Electricity usage monitor connects to appliances and assesses efficiency
Large LCD display counts consumption by the kilowatt-hour
Calculates electricity expenses by the day, week, month, or year
Displays volts, amps, and wattage within 0.2 - 2.0percent accuracy
Compatible with inverters; designed for use with AC 115-volt appliances

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9.0

KILL A WATT

Kill A Watt Connect P4498 Electricity Usage Monitor Power Consumption Meter with Two Piece Housing and 35 Inch Cord for Easy Use

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Main Highlights

35 inch cord allows you to place plug in out of the way places while the display remains easy to read
See the cost of an appliance by HOUR DAY WEEK MONTH YEAR
Displays the following measurements Volts Current Watts Frequency Power Factor VA
Stores Minimum and Maximum readings in Memory
Accurate and easy to use

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8.8

MECHEER

Upgraded Watt Meter, Watt Usage Meter Plug Home Energy Monitor Consumption, Electricity Usage Monitor, Energy Voltage Amps Kill Tester with Backlight, Overload Protection, 8 Modes Display

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Main Highlights

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 8 display modes, you can easily know the various parameters while the appliance is working. The wattage meter can also calculate and display how much power your appliance uses and how much electricity bill it cost in cumulative time
Premium Material: The whole body of our power monitor is made of high-quality PC material. It makes our home power consumption monitor more long lasting, heat resistant and fall resistant. The standard US socket and plug is suitable for all US standard appliances
Overload Protection: When the power of the appliance exceeds the overload power, the word "OVERLOAD" and the LCD display will keep flashing, the buzzer will keep making a bi sound to warn the users. All the buttons will quit working and can only work again when the overload alarm has been cleared by raising the setting value or removing the appliance. 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 "MODE" button for more than 3 seconds to enter the setting
KWH Alarm: Our power monitor plug has a upgraded power consumption alarm function. You can set the alarm power consumption for the appliances you monitored. Once the accumulated power consumption reaches the set alarm power consumption, the word "kwh alarm" will be displayed and keep flashing, the LCD will also keep flashing, and the buzzer will keep making a bi sound all the time to warn the users
Data Memory Function: The watt meter plug in will record your power consumption data when you remove energy meter from socket, or remove appliances from the electricity monitor. All setting data and cumulative data(electricity quantity, cost, unit price, time) will be saved. You can directly see the last data when you use the electric usage meter plug next time(NOT including current, voltage, power, power factors). This function can also automatically save the data when there is a sudden power failure
Backlight Display: With white backlight and black words, the LCD display of our wattage meter plug in 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 "DOWN" button to turn on and off the backlight manually
Adjustable Backlight Time: Our power usage meter also 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=normally on), finally press the "SET" to save the backlight time settings
Monitor Your Energy Usage: Our watt meter power analyzer is perfect for monitoring the electricity usage of your home appliances, controlling your power consumption, and saving your money. Your best choice for voltage meter, kilowatt meter, current meter and electricity meter

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8.6

MECHEER

Upgraded Watt Meter Power Meter Plug Home Electricity Usage Monitor, Electrical Usage Monitor Consumption, Energy Voltage Amps Kill Meter with Backlight, Overload Protection, 7 Modes Display-With Cord

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Main Highlights

Various Monitoring Parameters: The power energy meter 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
Monitor Your Energy Usage: With 13 inch 16AWG extension cord included, our watt meter power analyzer is perfect for monitoring the electricity usage of your home appliances, controlling your power consumption, and saving your money. Your best choice for voltage meter, kilowatt meter, current meter and electricity meter

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8.3

HBN

HBN Watt Meter Plug with Backlight, Plug-in Socket Power Meter Electricity Usage Monitor Consumption Home Electrical Energy Monitor, Voltage Amps Wattage Electricity Usage Tester, 9 Display Modes

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Main Highlights

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 screens 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.

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8.1

KILL A WATT

P3 International P4456 Kill A Watt Flex Electricity Usage Monitor – Advanced Power Meter with Data Memory, CO₂ Tracking & Cost Calculator – Upgrade from P4400 Watt Meter

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Main Highlights

Unlike basic watt meters, the P4456 stores your power usage data, so you dont lose readings when moving between outlets or appliances.
See not just how much electricity you use, but your estimated environmental impact a feature not available on standard watt meters.
Instantly measure volts, amps, watts, kilowatt-hours, and projected electricity costs by day, week, month, or year with improved display cycling.
Ideal for refrigerators, freezers, space heaters, AC units, gaming PCs, mining rigs, and appliances with fluctuating power draw.

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8.1

P3

2-Pack P3 P4400 Kill A Watt Electricity Usage Monitor (2-Pack)

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Main Highlights

Choose from the Kill-a-Watt's four settings to monitor your electrical usage
Monitor your electrical usage by day, week, month, or year
Electricity usage monitor connects to appliances and assesses efficiency
Large LCD display counts consumption by the kilowatt-hour
Calculates electricity expenses by the day, week, month, or year
Calculates electricity expenses by the day, week, month, or year
Compatible with inverters; designed for use with AC 115-volt appliances

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Our Best Overall Choice

Best Choice

9.7

MECHEER

Upgraded Watt Power Meter Plug Home Electrical Usage Monitor Consumption, Energy Voltage Amps Kill Tester with Backlight, Overload Protection, 7 Modes Display

Free Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

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
Monitor Your Energy UsageOur watt meter power analyzer lets you track electricity consumption and manage power usage to help save on bills. It works as a voltage, kilowatt, current, and electricity meter. If you have any questions about your meter socket, feel free to contact us

Show Price

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