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From the manufacturer

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.

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

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	(9,695) 4.6 out of 5 stars
Date First Available	September 9, 2004

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

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

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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

Safety and product resources

Safety documents

User Manual (PDF)

Important information

Legal Disclaimer

Warranty does not cover misuse of product.

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Customer reviews

9,695 global ratings

How customer reviews and ratings work

Customers say

Customers find the electricity usage monitor works well, is easy to use and read, and consider it a valuable tool that helps save money. The device assists with finding power consumption, with one customer noting it shows total power consumption over hours/days. While the functionality receives mixed reviews, with several customers reporting it stopped working within a month of intermittent use.

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Works well Device quality Ease of use Value for money Energy efficiency Utility Energy usage Functionality

1,392 customers mention "Works well"1,310 positive82 negative

Customers find that the electricity usage monitor works well, reliably measuring energy consumption.

"Was shipped quick and came packaged good. Works great and can help you see how much energy devices use and if they use power when they are turned off..." Read more

"This works well if you want to see the watts of a device on high, but if you turn the device down, this can only keep track of watts down to about 85..." Read more

"Works as advertised. Very valuable to me. Needed to monitor a couple of high power use systems to determine power supply required for future units...." Read more

"works as described. Only problem with is that you have to take the readings while it's plugged into power. The readings go away when you unplug it." Read more

958 customers mention "Device quality"931 positive27 negative

Customers find the electricity usage monitor to be a great little device to own.

"...The list goes on and on... This is a great product that can save you money by using less power, and allow you to be more environmentally..." Read more

"This is a good product but there were no good directions on the use of this this product as far as the limits of eletricity for good economy...." Read more

"...It is a great tool. I was able to determine that some things that I was turning off all the time aren't really using energy when they are off...." Read more

"Excellent product and quality .I highly recommend it to anyone who needs to know the power consumption of any electronic device with a capacity up..." Read more

683 customers mention "Ease of use"625 positive58 negative

Customers find the electricity usage monitor simple to use and read, with straightforward setup.

"...Easy to use, would help if it were a bit smaller so it woulnldnt waste a second outlet since its bulky and when plugged in the top outlet is useless" Read more

"Simple and straight forward product that allows you to find power hogs. Nice legible display and great tactile feel of the buttons to change settings." Read more

"Very easy to use. I'm a home owner that is trying to reduce my electricity costs and investigating Watt and kwh usage for appliances. So easy to use...." Read more

"...I just realized that my refrigerator takes 90 kwh a month. Simple to use and meet expectations. Then why not the 5 star - for the delivery issue...." Read more

611 customers mention "Value for money"555 positive56 negative

Customers find the electricity usage monitor well worth the cost, helping them save money over time.

"This item fully met my expectations. Great price and if it performs for a reasonable length of time, I will be extremely well satisfied." Read more

"Have wanted one of these for years and seemed like a good price and I will sure check out much of our power robbing stuff that seem to be off when..." Read more

"...Highly recommended, is cheap and you can check your ac freq and exact voltage (i have 128 volts from 127 expected in the ac line)........." Read more

"Easy to use, accurate, and inexpensive. Great for seeing how much everything in your home draws so you know how big of a generator to get." Read more

428 customers mention "Energy efficiency"359 positive69 negative

Customers appreciate the energy monitor's ability to measure power consumption in watts, helping them understand and conserve electricity.

"...$20 kill-a-watt meter is a must have device for anyone looking to save energy (== money) by identifying which appliances hog the most energy, and..." Read more

"...Just the act of recording is not only a time-saver, but an energy saver, as I tend to watch most shows late in the evening, when the house is..." Read more

"...investment if you are looking to make your house (or business) more energy efficient and save yourself a nice chunk of change in the process." Read more

"FOR $20.00 THIS IS ONE OF THE BEST THING TO SAVE MONEY AND ENERGY. I'VE PLUGGED IN ALMOST EVERYTHING , INCLUDING THE REFRIGERATOR TO SEE THE WATTAGE...." Read more

425 customers mention "Utility"412 positive13 negative

Customers find the electricity usage monitor very useful and practical, with one customer noting it's particularly handy when working with appliances and outlets.

"...Gives wattage consumption w/o calculating ohms law yourself. Very useful especially when checking manufacturer's specs vs real power consumption." Read more

"...it is one of the best meter u can buy anywhere,100% efficient and useful.i am a technician and i use it to check power used by different appliances." Read more

"...I'd rather not know what the energy use is... However, it is very handy, I have even used it to trouble shoot and make sure there is power and in..." Read more

"This is a very useful tool that allows you to measure the energy use of a 120v appliance. Works well, is accurate and reasonably priced...." Read more

334 customers mention "Energy usage"330 positive4 negative

Customers find the electricity usage monitor very useful, as it helps them understand their home's energy consumption and discover whether devices draw power.

"This is an electricity usage monitor. If you need to do that, this will do that...." Read more

"...measure kilowatt hours... which if you're serious about monitoring your electricity usage, that setting will probably come in the most handy." Read more

"It's been very helpfully tracking energy usage. It showed me the old garage fridge i have isnt as nearly as inefficient as i would have thought." Read more

"This P3 is great to monitor your electricity consumption. I used this to see how much a computer was using when it was awake and turned off...." Read more

338 customers mention "Functionality"125 positive213 negative

Customers report mixed experiences with the functionality of the electricity monitor, with some saying it worked well for about a month of intermittent use, while others mention it stopped working within the same timeframe.

"The product only lasted me 3 months before it stopped working. It seems to be completely dead and I've tried multiple different outlets and devices." Read more

"I was initially thrilled with the item. It worked great for a few times but it didn't last very long. It quit working after a few usages...." Read more

"...It quit working as soon as I plugged it into heater. Called manufacturer and they said, too bad, the heater was probably over the max. 15 amps...." Read more

"...It stopped working. Ironic the warranty is only 6 months. I imagine the fuse went out in it...." Read more

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Top reviews from the United States

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Alexis
Good product, do the expected work.
Reviewed in the United States on November 9, 2008
Size: Original versionVerified Purchase

This product works as expected. I purchased this unit to make an analisis about parasit power consumption in my electronic appliances in home.

I discover the following:

- the lcd requires 180 ~ 230 watts. After going to standby or shutdown, the tv use 60 watts for 3 minutes. This is to cool down the lcd lamp for protection (fans and additional circuit works for this time). Can be a mistake if I remove the AC cable power or enterely shutdown the tv without allow this process to finish. Good discover. After this 3 minutes, the standby mode on the monitor only requires 05. to 1w.

- my motorola cable system requires the same ammount of power (27 ~ 30 watts) no matter if this unit is ON or off!!!!... all the time is fully powered (because have an internal hard drive). But I believe (wrong!) this unit must save about 50% if is off.. but no!!!!

- the blackberry / sony ericson chargers do not drain any power (0W) from AC if the phone itself is not connected. I DON't need to disconect this chargers from the outlets.

- My APC Smart UPS 1500 drain 30 WATTS! even when is completely turned off!!!Is better to disconnect this unit from the ac cable!!! amazing!...

- My pc (dimension 9150) is a power hungry pc. Because have pentium D (first edition) who requires a lot of power. This pc requires 230 watts but when I play Command Conquer (3D real time strategy) and because I have a HD2900 ATI High Definition card who requires 650 watts PSU. Interesting: when I play the game the power rise from 230 to 300~320 watts!!!!

This unit is very usefull to understand how the electronic systems works and if are energy efficient and how you must manage this units to save power and money.

Highly recommended, is cheap and you can check your ac freq and exact voltage (i have 128 volts from 127 expected in the ac line)......

enjoy and sorry my english

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Max Oldham
Would buy again
Reviewed in the United States on October 14, 2025
Size: Original versionVerified Purchase
Good value, works well.

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Neurologist
Extremely Useful
Reviewed in the United States on September 20, 2012
Size: Original versionVerified Purchase
Don't bother buying the more expensive models of the Kill-A-Watt. 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 (at the outlet), and frequency (60 hertz). 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. To calculate how many kilowatt hours your device will use in a month, you just need a bit of simple math:

(Watts/1000) x (number of hours device is turned on per day) x (31 days) = Kilowatt hours per month

Example for a 100 watt light bulb that is left on continuously for a month:

(100/1000) x 24 x 31 = 74.4 kwh per month

Note that a kilowatt is 1000 watts and 1 kilowatt hour is the equivalent of ten 100 watt light bulbs burning for 1 hour.

Electricity is billed in kilowatt hours so you can find out how much each kilowatt hour costs by contacting your electric company or looking on their website. Your electric bill should tell you how many kilowatt hours you used in a given month. It is easy to calculate how many tons of CO2 your electricity use produces. The EPA website estimates 6.8956 x 10-4 metric tons of CO2 per Kilowatt hour. I pay for 100% wind power through my utility, which only adds about $1.80 per month to my electric bill and we use a lot of electricity (about 1200 kwh per month). Part of this large number is the fact the landlord installed an electric water heater (a gas water heater would be much more efficient).

I finally ordered a P3 Kill-A-Watt and wish I had ordered one 10 years ago because it would have paid for itself many times over. If you check various items in your home, you will be surprised at how much electricity things use. Many electrical devices draw 2 to 5 watts or more when they are turned off but left plugged in! When you count how many things you have plugged in in you home, this adds up. I now unplug things I am not using.

One of the biggest energy wasters is the common light bulb, which wastes 98% of its energy as unwanted heat. For comparison, I have an old style Sony 32 inch TV (picture tube, not flat panel) that draws 150 watts. A single reading lamp with a common 150 watt bulb uses the same amount of electricity as this large TV. You are much better off using compact fluorescent bulbs which use FAR LESS electricity. Amazon sells GE compact florescent 100 watt (equivalent) bulbs that actually use only 26 watts. (Type "compact fluorescent 100 watt" into Amazon search). The compact florescent GE 60 watt (equivalent) bulbs actually use only 13 watts. These bulbs screw right into your existing lamps and light fixtures and will pay for themselves many times over. The downside of compact florescent bulbs is that they contain a significant amount of mercury (about 5 grams). There are special cleanup procedures you should follow if you accidentally break one inside--open a window, do NOT vacuum--see the EPA's "Cleaning Up a Broken CFL" article for the full procedure [...]
Because compact florescent bulbs contain mercury, they must not be disposed of in regular trash. Call your local municipality to learn how to dispose of items that contain mercury--many municipalities have recycling programs for mercury containing items. A much better alternative to compact florescent bulbs are LED bulbs (do not contain mercury) which are a new technology and consequently expensive at the moment but prices will come down with time.

A final note on the Kill-A-Watt regarding computer power supplies. I build computers and, prior to owning a Kill-A-Watt, ended up buying much larger (and more expensive) power supplies than I really needed because of some misleading information on the web. For example, the computer I am typing this on with a good Intel CPU and an expensive video card draws 130 watts at idle and 270 watts with both CPU and video card fully loaded (running Prime95 and 3DMark simultaneously). Unfortunately, I put a 750 watt power supply in this computer, which was totally unnecessary. 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 at full load.

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Patrick Montague
Non UK product
Reviewed in the United Kingdom on November 22, 2022
Size: Original versionVerified 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
Excelente producto.
Reviewed in Mexico on August 1, 2018
Size: Original versionVerified 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
Shouldn't Be Sold In Japan
Reviewed in Japan on January 19, 2021
Size: Original versionVerified 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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David Nagle
It worked as advertized.
Reviewed in Canada on October 1, 2025
Size: Original versionVerified Purchase
Very pleased with product. Thank-you.

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Rod
Not useable in UK
Reviewed in the United Kingdom on August 25, 2021
Size: Original versionVerified 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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P3 P4400 Kill A Watt Electricity Usage Monitor

Additional Details

Product voltage: 115

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Electricity Usage Monitor

Kill A Watt EZ Power Monitor

User Friendly and Easy to Install

Save on Your Electricity Bills

Unique Features

Technical Specifications

Kill A WATT EZ Power Monitor

Model P4400

Product information

Technical Details

Additional Information

Warranty & Support

Feedback

Where did you see a lower price?

Product Videos

Product Description

Amazon.com

Empowers You to Save Hundreds on Electric Bills

Find Out How Much Electricity You're Using

Technical Specifications

Safety and product resources

Safety documents

Important information

Similar brands on Amazon

Customer reviews

Customers say

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reset is more complex than older units...but it works

Top reviews from the United States

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5.0 out of 5 stars Good product, do the expected work.

5.0 out of 5 stars Would buy again

5.0 out of 5 stars Extremely Useful

Top reviews from other countries

1.0 out of 5 stars Non UK product

5.0 out of 5 stars Excelente producto.

1.0 out of 5 stars Shouldn't Be Sold In Japan

5.0 out of 5 stars It worked as advertized.

1.0 out of 5 stars Not useable in UK

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Product Summary: P3 P4400 Kill A Watt Electricity Usage Monitor

Price

About this Item

Product Description

Empowers You to Save Hundreds on Electric Bills

Find Out How Much Electricity You're Using

Technical Specifications

Newer Version Available

Options Available

Size

Important Information

Legal Disclaimer

Bulb Voltage

Product Guidance & Documents

Feedback

Good product, do the expected work.

Would buy again

Extremely Useful

Non UK product

Excelente producto.

Shouldn't Be Sold In Japan

It worked as advertized.

Not useable in UK

Product summary presents key product information

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