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P3 P4400 Kill A Watt Electricity Usage Monitor

4.6 out of 5 stars 9,723 ratings
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Purchase options and add-ons

  • 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

Additional Details

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There is a newer model of this item:

P3 International P4460 Kill A Watt EZ Electricity Usage Monitor , grey
P3 International P4460 Kill A Watt EZ Electricity Usage Monitor , grey
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    Certification Body
    Kai Xin
    Certification Number
    TE-00107767

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From the manufacturer

P4400

Electricity Usage Monitor

It's no secret that electricity bills are on the rise. With the P3 P4400 you can cut your energy costs and find out what appliances are actually worth keeping plugged in by finding power-wasting appliances. Simply connect any appliance to the Kill A Watt EZ, it will then assess how efficient each appliance really is.

P4400

Kill A Watt EZ Power Monitor

Calculate your homes cumulative electrical expenses and forecast by the day, week, month, even an entire year. Also check the quality of your power by monitoring Voltage, Line Frequency, and Power Factor. Now you’ll know if it is time for a new refrigerator or if that old air conditioner is still saving you money. With the amazing Kill A Watt EZ you’ll know 'Watts' killing you.

User Friendly and Easy to Install

P4400

Save on Your Electricity Bills

Unique Features
  • Easy to read large LCD screen
  • Accurate within 0.2%
  • Calculates cost and forecasts by week, month and year
  • Displays eight critical unites of measurements
  • Built in Battery Backup
Technical Specifications

Model: P4400

Operating Voltage: 115 VAC

Max Voltage: 125 VAC

Max Current: 15 A<

Max Power: 1875 VA

Weight: 5 oz

Dimensions: 5 1/8″ H x 2 3/8″ W x 1 5/8″ D

Kill A WATT EZ Power Monitor

Model P4400

With the P4460 you can easily identify which appliance in your home is costing you the most money. The Power Monitor also allows you to enter your Utility providers cost of electricity so you can monitor and pinpoint what each appliance is costing you.

Founded in 1987, P3 International is a privately owned manufacturer of solution oriented consumer products. For the last twenty five years we have strived to develop products that are easy to use and ahead of their time.

We are committed to manufacturing high quality products that appeal to a variety of different people, from the environmentally conscious to the more technologically minded consumer. With this philosophy driving us we are always looking for innovative new products which we can offer our customers.

Product information

Technical Details

Manufacturer ‎P3
Part Number ‎P4400
Item Weight ‎5.6 ounces
Product Dimensions ‎8.4 x 2.1 x 6.1 inches
Item model number ‎LGP4400
Batteries ‎1 CR123A batteries required.
Is Discontinued By Manufacturer ‎No
Size ‎Original version
Color ‎No Color
Style ‎1 Pack - Model P4400
Material ‎Other
Pattern ‎Monitor
Power Source ‎air-powered
Voltage ‎115 Volts
Amperage Capacity ‎15 Amps
Item Package Quantity ‎1
Number Of Pieces ‎1
Display Style ‎LCD
Certification ‎No
Special Features ‎Portable
Usage ‎personal
Included Components ‎usage monitor
Batteries Included? ‎No
Batteries Required? ‎No
Warranty Description ‎1 Year Limited

Additional Information

ASIN B00009MDBU
Customer Reviews
4.6 out of 5 stars 9,723 ratings

4.6 out of 5 stars
Date First Available September 9, 2004

Warranty & Support

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Product Warranty: For warranty information about this product, please click here. [PDF ]

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Product guides and documents

User Manual (PDF)

Product Description

Amazon.com

Empowers You to Save Hundreds on Electric Bills

Electricity bills are rising. Now you can cut down on costs and find out what appliances are actually worth keeping plugged in. Simply connect these appliances to the Kill A Watt, and it will assess how efficient they really are. The large LCD display counts consumption by the kilowatt-hour, the same as your local utility. You can calculate your electrical expenses by the day, week, month, even an entire year. Also check the quality of your power by monitoring voltage, line frequency, and power factor. Now you will know if it is time for a new refrigerator or if that old air conditioner is still saving you money. Kill A Watt can help you reduce your power bill and will help find power-wasting appliances so you are able to decide whether it is worth keeping them plugged in. For standard 115 VAC appliances only, 15 amps maximum, 125 VAC maximum.

Find Out How Much Electricity You're Using

The U.S Department of Energy reports that 20% of our electric bills come from items that are left plugged in when they are not in use, or items that are in standby mode. With the Kill A Watt P4400 we can monitor the energy eaters in our homes and cut down our electric bills at the same time. Plug whatever item you want into the device and it will tell you the efficiency of that item by displaying the kilowatt per hour. This device will help you determine which items are costing you the most to run. The Kill A Watt also calculates voltage, line frequency, current, and power factor. You can calculate your electric bill before you even receive it from the electric company.

Test The Quality of Your Home's Power

But measuring appliance consumption is just the tip of the iceberg. Because it can monitor voltage (Volt) and line frequency it can also test if an outlet is working, or evaluate the quality of the electrical power provided by your utility company. It can detect voltage drops around the house, help to predict brownout conditions or to make sure a new home's outlets are in working condition before escrow closes.

About P3 International

Founded in 1987, P3 International is a privately owned manufacturer of solution oriented consumer products. For the last twenty years they have strived to develop products that are easy to use and ahead of their time. Thanks to their customer-centric attitude and support from their clients, they have experienced steady growth over the past decade.

They are committed to manufacturing high quality products that appeal to a variety of different people, from the environmentally conscious to the more technologically-minded consumer. With this philosophy driving them they are always looking for innovative new products which they can offer their customers.

Their unique products have garnered much attention, in particular the Kill A Watt. Reviews of P3 products have been featured in newspapers such as The New York Times and The Wall Street Journal.




Technical Specifications

  • Accuracy: +/- 0.2%
  • Input Power: 115 volts AC, 60 Hz
  • Max Current: 15 amps
  • Max Voltage: 125 volts
  • Max Power: 1875 VA
  • Dimensions: 5.1 inches long x 1.6 inches thick x 2.4 inches wide
  • Approvals: ETL (c), ETL (us)
  • Origin: China
  • Manufacturer Warranty: 6 months

WARNING:

CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

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Customer Ratings
4.64.6 out of 5 stars9,723
4.34.3 out of 5 stars254
4.44.4 out of 5 stars103
4.64.6 out of 5 stars503
3.93.9 out of 5 stars65
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Important information

Legal Disclaimer

Warranty does not cover misuse of product.

Bulb Voltage

115 volts

Customer reviews

4.6 out of 5 stars
9,723 global ratings

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Customers say

Customers find the electricity usage monitor works well and is simple to use and install, providing useful information about appliance power consumption. The device helps track energy consumption and calculate costs, with one customer noting it uses only 30 watts of power. While some customers describe it as a solid product that withstands abuse for over a year, others find it flimsy. The display receives mixed feedback, with several customers finding it impossible to read, particularly in dark corners.

Select to learn more

FunctionalityPower usageEase of useUseEnergy efficiencyValue for moneyBuild qualityReadability
2,318 customers mention "Functionality"2,125 positive193 negative

Customers find that the electricity usage monitor works well and delivers performance that justifies its price.

"...for monitoring energy use, the Kill A Watt is also an economical substitute for a clamp meter and line splitter...." Read more

"Works perfectly!" Read more

"works great and as intended. I could measure what amperage I was pulling from my speaker amps." Read more

"It works just as described." Read more

1,003 customers mention "Power usage"958 positive45 negative

Customers appreciate the electricity usage monitor's ability to measure wattage and cumulative kWh, helping them track their energy consumption and identify power-hungry appliances.

"First one succombed after five years. It is a very useful meter to control the electric power power in my house." Read more

"...It also keeps track of the total number of kilowatts hours your device has used during the length of time you have been monitoring the device...." Read more

"...It allows you to easily monitor the power usage of appliances and devices by displaying real-time data on energy consumption, voltage, and costs...." Read more

"...It still gave credible wattage readings, but not KWH or amps. I bought another one immediately...." Read more

800 customers mention "Ease of use"702 positive98 negative

Customers find the electricity usage monitor easy to understand and operate, with simple setup and clear readings.

"...an electrician, the Kill A Watt may well be good enough, and it’s easier to use and less expensive...." Read more

"...Compact and user-friendly, it's a great option for those aiming to save on electricity bills or make their homes more energy-efficient...." Read more

"...Knowledge is Power! This is easy to use & well worth every penny of its cost...." Read more

"An easy-to-use gadget that may or may not yield significant energy savings or surprising results, but which will help you understand the power..." Read more

776 customers mention "Use"762 positive14 negative

Customers find the electricity usage monitor useful and effective for troubleshooting, providing valuable information about their appliances.

"...As long as the case is not damaged, this is likely an easy repair for someone with this type of skill...." Read more

"...This will really open your eyes to your bad habits, like leaving the TV on when you are not watching it...." Read more

"...Watching the numbers is valuable information. Left it plugged into a socket and forgot about it. Depends on the intent of use." Read more

"...that will keep you entertained for a couple of days and give you some good information. Then you should lend it out to everyone you know!..." Read more

639 customers mention "Energy efficiency"526 positive113 negative

Customers appreciate the energy efficiency monitor's ability to measure and inform about power consumption of various devices, helping them lower their electrical usage.

"Does exactly what is supposed to do, track power used through itself." Read more

"...The P3 model is more than enough. It will give you how many watts your device is drawing, as well as the number of amps, number of volts..." Read more

"...and user-friendly, it's a great option for those aiming to save on electricity bills or make their homes more energy-efficient...." Read more

"...It just shows how much more energy efficient things are today than they were 20 years ago...." Read more

359 customers mention "Value for money"316 positive43 negative

Customers find the electricity usage monitor provides good value for money, as it helps them figure out how much it costs to run electrical items and makes calculating electricity costs easy.

"...Kill A Watt may well be good enough, and it’s easier to use and less expensive...." Read more

"...It is easy to calculate how many tons of CO2 your electricity use produces...." Read more

"...Overall, it's a reliable and budget-friendly energy monitoring solution." Read more

"...I know this is the low-end model and I appreciate that it is fairly inexpensive...." Read more

271 customers mention "Build quality"169 positive102 negative

Customers have mixed opinions about the build quality of the electricity monitor, with some finding it solid and noting it has withstood abuse for over a year, while others report it being flimsy and breaking.

"...It is important to purchase a high quality power supply, but you definitely don't need a 750 watt power supply for a computer that draws 270 watts..." Read more

"...2. It is a little bit brick-like, so if you have limited room, you may want to get a short 3' or 6' grounded extension cord, if you can find one..." Read more

"...Overall, it's a reliable and budget-friendly energy monitoring solution." Read more

"Good quality and accuracy. There are two drawbacks: 1. there is no backlight (can not read in dark places) 2...." Read more

292 customers mention "Readability"25 positive267 negative

Customers find the monitor's display difficult to read, particularly in dark corners and low light areas.

"...• For some devices (e.g., a refrigerator), it can be mighty inconvenient to read without using at least one extension cord, which is a bit Mickey..." Read more

"...2. the display can be hard to read, I often have to shine a light directly onto it, this is my main reason for giving it 4 stars..." Read more

"...There are two drawbacks: 1. there is no backlight (can not read in dark places) 2. It is more expensive than similar products with backlight." Read more

"...in back of the tree and since once unplugged this unit does not maintain its display (having no battery backup) nor does it have a back light on its..." Read more

reset is more complex than older units...but it works
5 out of 5 stars
reset is more complex than older units...but it works
Hours and KWH usage 'stuck' after less than 6 months of very light, intermittent usage. Stuck at 6.99kWH - will not reset... Changed from 1 to 5 stars. While this is a P3 unit...it is different than my previous unit. The old unit would reset at every power removal - this unit you must manually reset - so it remembers power usage. Pilot error - my bad.
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Top reviews from the United States

  • Indel
    5.0 out of 5 stars Accurate
    Reviewed in the United States on June 2, 2025
    Item Package Quantity: 1Color: No ColorVerified Purchase
    First one succombed after five years. It is a very useful meter to control the electric power power in my house.
    Helpful
     Report
  • 38 special
    5.0 out of 5 stars Good for testing generator frequency output
    Reviewed in the United States on June 5, 2025
    Item Package Quantity: 1Color: No ColorVerified Purchase
    Used it to test a kilowatt output of a generator. Works as advertise.
    Helpful
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  • remote camper
    5.0 out of 5 stars Have a concern
    Reviewed in the United States on September 17, 2019
    Item Package Quantity: 1Color: No ColorVerified Purchase
    UPDATES at end of the review.

    Several reviews show the receptacle melted after using them with appliances that draw a fair amount of current. This should not be happening because these units are fused with a SEFUSE Thermal cutoff (at least mine is). I found out by using the device in a manner I knew was a little risky. Temp environment was over 106*F ambient and knew I was using it potentially at its upper limit. Well, it did fail and instead of throwing it away, took it apart to see if it was beyond repair.

    My rating is based on my experience with it over the last 3 years or so and the great service it has given me. I should probably add that the fact it failed under extreme use without melting the receptacle is also testament to its safety design and warrants some credit.

    The SEFUSE has a TEMPERATURE rating in addition to in this case, a 15 AMP current rating. For replacement parts, I have seen these rated between 128*C to 240* C. I guess the theory is that it can be used up to it max rating as long as the temperature rating of the installed SEFUSE is not exceeded. If this thing starts to go above the SEFUSE rating, the SEFUSE should fail well before the monitor's receptacle starts melting! I would guess that the Kil-A-Watt folks *might* have used a SEFUSE with a higher temp rating in some production runs than the original design called for. It might also be possible that the SEFUSES received by the mfr were faulty or mislabled. There might be some warranty wiggle room here for those where the monitor started melting. It was designed not to do that!

    My SEFUSE is *open* indicating that it did its job to prevent overheating the plug/unit. I have to look closer at it to see if I can determine the rating, otherwise I will have to take the new 4440 I just ordered apart and look at that one. There are ways to test to see if replacing the SEFUSE is the problem, but won't go into it here for liability reasons. SEFUSES are available on Amazon at a pack of 5 for under $10. Looks like a stout soldering iron will be needed to effect the repair if you want to pull the old leads from the board. I have done similar repairs by cutting the leads of the failed component and installing the replacement matching its lead length to the original installation. A much lesser wattage soldering iron will do the trick.

    I like mine and needed a second one anyway. I am fairly certain replacing the SEFUSE in mine with one of the correct rating will restore original safety design and operation. I do not encourage user replacement of any components in this monitor. This review serves only to explain my experience and what I plan to do to try to correct it.

    UPDATED 9/19/2019
    The SEFUSE was in fact the issue. If one does a search on Disassembly and Repair of the Kil-A-Watt meter, a video will likely be available on the topic. The SEFUSE in this instance was rated at 99C (210F) in addition to its current rating. A word of caution here. I have seen this component with temp ratings spanning 77C to 240C at 15 amps. It is available with the same rating at 10 amps. The closest one I can find on Amazon is 94C (201F) at 15 amps. If you decide to take this on, be SURE you do not exceed 99C for the replacement component. Since it is available in such a broad range, it reinforces my theory somewhat that some production runs were using the wrong value on the low end (causing early failure) as well as perhaps on the high end (causing the case to melt). This doesn't excuse the failures, but offers some explanation as to what might be occurring. As long as the case is not damaged, this is likely an easy repair for someone with this type of skill. The 94C component is close enough for me.

    UPDATE 9/23/2019
    New meter arrived and the SEFUSE checks out at 15A/99C. Back of meter rated @1800W. MAX Power on packaging states 1875W. Would use the meter only for a quick measurement and NOT for sustained use much above 50% of its rating. Will just order the 94C SEFUSE from AMZ. to repair the old one.
    45 people found this helpful
    Helpful
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  • Jeff C.
    4.0 out of 5 stars A handy gadget, for more than one task
    Reviewed in the United States on May 18, 2025
    Item Package Quantity: 1Color: No ColorVerified Purchase
    The Kill A Watt Energy Monitor (I have the P4400) can be mighty useful for determining energy usage of plug-connected devices, especially ones with varying usage, such as refrigerators, plug-connected air conditioners, humidifiers and dehumidifiers, and perhaps computers.

    I got mine in 2018, so it may not be quite the same as current models.

    A few things could be improved:

    • It would be mighty nice for the display to have a backlight. But, unlike some others, I have no problem reading it when shining a flashlight on it in a dark location.

    • For some devices (e.g., a refrigerator), it can be mighty inconvenient to read without using at least one extension cord, which is a bit Mickey Mouse. A Kill A Watt Connect (https://www.amazon.com/dp/B0CVS4WXM9) might address this, but some have suggested the 32″ connecting cable is on the short side. I don’t have that model, so I can’t comment from experience.

    • When plugged into the top outlet in a duplex receptacle, it blocks the lower receptacle. Again, a short extension cord could fix this.

    • As several others have noted, the outlet receptacle is mighty tight. Not so tight as to be unusable, but much tighter than a normal receptacle—and it doesn’t have the same feel as a hospital-grade receptacle, which is also pretty snug.

    • There is no battery backup, so acquired data are lost in a power failure. Power failures where I live are infrequent, so this isn’t a big deal for me. There are other models that do have battery backup.

    This model doesn’t calculate energy cost (some others do), but this isn’t a big deal for me; I think it’s probably easier to just put the energy consumption data in a spreadsheet and figure the cost there.

    There are some other brands that cost less and even have more features; I haven’t tried them so I can’t really comment. I haven’t felt the need for most of these features strongly enough to try another model.

    Were it possible, I’d probably give the Kill A Watt a 4.5.

    A Poor Man’s Clamp Meter?
    For devices like a hair dryer or toaster that have relatively constant consumption when in use, I’m not sure it’s necessary to accumulate months of data unless one is a real fanatic—so a quick measurement will often suffice.
    Though intended for monitoring energy use, the Kill A Watt is also an economical substitute for a clamp meter and line splitter. I have a hard time believing that it’s in the same league, but the specifications suggest otherwise—and the indicated values are very close to what I get with a Fluke 87 and i400 current clamp. For someone who’s not an electrician, the Kill A Watt may well be good enough, and it’s easier to use and less expensive. One big convenience: it’s easy to quickly switch between current and voltage under load at the press of a button, which is much harder to do with fancy meter.

    The Kill A Watt also provides watts, VA, and power factor at the press of a button. Results can sometimes be surprising: I have one low-flicker LED bulb with a power factor of 0.7, while this isn’t great, I remind myself that the VA is still a lot less than that of an incandescent bulb with a unity power factor. And it’s interesting just to know this stuff.
    For this purpose, the Kill A Watt seems better suited than some of the newer models with extra features that don’t really apply.
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  • Jeff J
    5.0 out of 5 stars works well.
    Reviewed in the United States on May 21, 2025
    Item Package Quantity: 1Color: No ColorVerified Purchase
    Does exactly what is supposed to do, track power used through itself.
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  • Austin
    5.0 out of 5 stars Does the job
    Reviewed in the United States on May 28, 2025
    Item Package Quantity: 1Color: No ColorVerified Purchase
    Works perfectly!
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  • Troy Tully
    5.0 out of 5 stars Great quality and works
    Reviewed in the United States on May 15, 2025
    Item Package Quantity: 1Color: No ColorVerified Purchase
    works great and as intended. I could measure what amperage I was pulling from my speaker amps.
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  • HAPPY !!
    5.0 out of 5 stars This is a money saver
    Reviewed in Canada on February 12, 2024
    Item Package Quantity: 1Color: No ColorVerified Purchase
    To start , I lent someone my 12000 watt generator . They said it was too hard on gas so they turned the idle down .. a lot .
    When I got it back , I turned it up to were I thought it was before .. but not so . with in 3 days of out power outage .. it fried my microwave , because it was not putting out 60hz .
    I bought this P3 .. ran my generator and plugged it in a wall plug in my house . the meter said 42hz . So I was was able to adjust it to run at 60hz .. in my house .
    Great meter , it does a whole lot more that what I wanted it for . BUY ONE !!!
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  • Patrick Montague
    1.0 out of 5 stars Non UK product
    Reviewed in the United Kingdom on November 22, 2022
    Item Package Quantity: 1Color: No ColorVerified Purchase
    If you live in the UK, do NOT buy this product. It is not designed for the UK and you will have to return it. The company, so far, has refused to pay the return postage, even though this is entirely their mistake. I have no idea why it is not clearly labelled.
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  • Jorge
    5.0 out of 5 stars Excelente producto.
    Reviewed in Mexico on August 1, 2018
    Item Package Quantity: 1Color: No ColorVerified Purchase
    Fantástica compra, cumplió todas mis expectativas y al tener un soporte de hasta 1.8kw me permite medir dispositivos de alto consumo.

    Quien iba a decir que mi PC (solo el gabinete) consume 4 veces mas que mi refri de 7 pies. Gracias a esta maravilla, ahora lo sé.

    Recomendadísimo, entrega en excelentes condiciones y vino empaquetado con su bolsa antigolpes.
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  • Phil
    1.0 out of 5 stars Shouldn't Be Sold In Japan
    Reviewed in Japan on January 19, 2021
    Item Package Quantity: 1Color: No ColorVerified Purchase
    1. Operating voltage is incompatible with Japan's 100VAC.
    2. Seller support is poor and maker (P3) doesn't respond to emailed questions.

    A waste of money.
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  • Rod
    1.0 out of 5 stars Not useable in UK
    Reviewed in the United Kingdom on August 25, 2021
    Item Package Quantity: 1Color: No ColorVerified Purchase
    Bought this on Amazon UK and it does not state that it is not suitable for UK use - plugs are US(?). Will now have to pay a lot to return it to a US address. Not impressed.
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