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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

› See more product details

Additional Details

Small Business

This product is from a small business brand. Support small.

Customer ratings by feature

Easy to use

4.8

User interface

4.8

Value for money

4.7

Energy efficiency

4.6

See all reviews

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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 guides and documents

User Manual (PDF)

Looking for specific info?

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

Country of Origin

‎China

Item model number

‎LGP4400

Batteries

‎1 CR123A batteries required.

Is Discontinued By Manufacturer

‎No

Size

‎Original version

Color

‎White

Style

‎1 Pack - Model P4400

Material

‎Other

Pattern

‎Monitor

Power Source

‎Corded Electric

Voltage

‎115 Volts

Amperage Capacity

‎15 Amps

Item Package Quantity

‎1

Number Of Pieces

‎1

Display Style

‎LCD

Certification

‎ETL

Special Features

‎Portable

Usage

‎personal

Included Components

‎NO

Batteries Included?

‎No

Batteries Required?

‎No

Warranty Description

‎1 Year Limited

Additional Information

ASIN

B00009MDBU

Customer Reviews

9,485

4.6 out of 5 stars

Best Sellers Rank

#10,616 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
#5 in Electrical Meter Sockets

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

WARNING:

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

WARNING: California’s Proposition 65

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	This Item P3 P4400 Kill A Watt Electricity Usage Monitor	Recommendations KETOTEK Watt Meter Power Meter Plug Electricity Usage Monitor for Home, Energy Monitor with LCD Display, Kilowatt Meter Socket Outlet, Voltage Amps Power Consumption Meter, Overload Protection	dummy BN-LINK LCD Plug in Power Energy Meter Voltage Amps Electricity Usage Monitor Digital LCD Display Wall Socket Outlet,Power Consumption Monitor, 9 Display Modes for Energy Saving, Watt Meter	dummy KILL A WATT P3 International P4456 Kill A Watt Flex Plug-in Electricity Usage + Power Consumption Monitor, Watt Voltage Tester, Electrical Energy Saving Monitor with Auto Cost Calculator
	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart
Price	-19% $32.16 List: $39.95	$17.99	$13.99	$43.90
Delivery	Get it as soon as Wednesday, Apr 10	Get it as soon as Wednesday, Apr 10	Get it as soon as Thursday, Apr 11	Get it as soon as Wednesday, Apr 10
Customer Ratings	4.69,485	4.6371	4.4728	3.926
Accuracy	4.5	4.4	4.2	—
Easy to read	4.3	4.5	3.3	—
Easy to use	4.8	—	4.1	—
Value for money	4.7	—	4.9	—
Energy efficiency	4.6	4.7	—	—
Sold By	Timers Plus	Ketotek	BN-LINK	Timers Plus

Important information

Legal Disclaimer

Warranty does not cover misuse of product.

Bulb Voltage

115 volts

Customer reviews

4.6 out of 5

9,485 global ratings

How customer reviews and ratings work

Customers say

Customers like the quality, value, and performance of the tool. For example, they mention it's easy to use, provides great information, and is good value for the money. Some appreciate accuracy, and ease of use. That said, opinions are mixed on readability, and electricity.

AI-generated from the text of customer reviews

1,804 customers mention1,571 positive233 negative

Customers like the performance of the tool. They say it works perfectly for their needs, the circuit works great, and is very useful to understand electronic systems. Some customers also mention that it's a great little gadget and practical.

"Works great. Easy to use." Read more

"...Worked great. Now I will use it on other systems in my house." Read more

"...Now, as for the rest, this thing does what I want it to, and does it quite well...." Read more

"I never knew how useful this would be. I'm very happy with the performance. It should be a part of every technicians kit...." Read more

1,039 customers mention907 positive132 negative

Customers like the accuracy of the tool. They say it's especially good for monitoring energy usage while the equipment is on standby, investigating electrical power usage, and verifying the power consumption of appliances. It's also useful for measuring Power Factor, kWh, and time of use, plus other useful numbers such as current, power, and assessing energy efficiency. It also tracks the cumulative electricity used from the point you plug something in, and helps monitor them all.

"...this "Kill a Watt" and I am so impressed with ease of use and unequalled accuracy. Makes predicting usage over a day or week a breeze!" Read more

"...Useful to check during brownout conditions, simply because using some appliances during low voltage conditions can potentially damage them..." Read more

"...test, but I am having so much fun with this, besides having it inform energy use...." Read more

"...It will also track the cumulative electricity used from the point you plug something in...." Read more

820 customers mention726 positive94 negative

Customers find the tool very simple to use and enlightening. They say the device is not complex, the settings and buttons make sense, and the display is easy to read. They also say it helps with troubleshooting and answers some questions.

"Works great. Easy to use." Read more

"...I started saving money the first week I began using this gauge. It's easy to use and gives you great information...." Read more

"This is a pretty neat device that measures how many watts a device is using and keeps a total of kilowatt hours used over time..." Read more

"...I bought this "Kill a Watt" and I am so impressed with ease of use and unequalled accuracy. Makes predicting usage over a day or week a breeze!" Read more

657 customers mention538 positive119 negative

Customers like the quality of the tool. They say it's surprisingly useful, easy to use, and provides great information. They also mention that it makes for an interesting experiment and reveals interesting facts. Overall, customers are happy with the product's quality and functionality.

"...It's easy to use and gives you great information. You'll be surprised where your excess electricity is going. This gauge will tell you...." 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

"...It reveals some insteresting facts such as how much energy an amplifier consumes when idle..." Read more

"...I think this gadget has potential for being useful...." Read more

457 customers mention413 positive44 negative

Customers find the tool to be a good value for the money. They say its utility justifies the price, and the price is acceptable for a diagnostic tool. Customers also say it's an easy way to save money and is simpler than cheaper knockoffs.

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

"Decent price, and I may use it more in the future...." Read more

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

"...LED bulbs can save a TON of money over incandescent without the risk of mercury in fluorescents bulbs and LED will last forever unlike fluorescent..." Read more

335 customers mention108 positive227 negative

Customers have mixed opinions about the readability of the tool. Some find it easy to read and understand, with clear buttons and numbers. They also say the display is easy to see in dim light and from an angle. However, some customers report issues with the display being difficult to read in low light and at most angles.

"...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

"...matter is it makes this screen, with relatively small characters, difficult to see when using in receptacles below knee level...." Read more

"...It's easy to read and understand though. Buttons are clearly marked...." Read more

"Works well. Flaws: plugs block the screen, lcd hard to read at most angles, it needs a backlight." Read more

157 customers mention88 positive69 negative

Customers are mixed about the electricity. Some mention that it gets them thinking about energy efficiency, saves quite a bit of power, and is an essential tool to combat wasted energy. However, others say that it registers zero Watt or AMP and wastes electricity for no reason.

"...I LOVE this device, because it's helped me logically evaluate actual energy usage, instead of just going by my "gut" feeling...." Read more

"...THIS ONLY SHOWS YOU REAL TIME POWER USAGE AND AVERAGE POWER CONSUMED. limited data available and no BT or app capabilities...." Read more

"...but it can also be used to save energy..." Read more

"...with this meter I have discovered that the Appliance energy rating is usually overly optimistic based on cost per Kwh that do not reflect any..." Read more

155 customers mention5 positive150 negative

Customers are dissatisfied with the backlight of the tool. They say that the display is not backlit, so it's hard to tell which value is being displayed. They also say that it needs a new backlit display with a wider viewing angle. Some customers also mention that the LCD display is very dark and hard to read.

"...bring a light with you because it has no backlight either." Read more

"...I knew this model did not have a light and don't usually deduct for such features but the fact of the matter is it makes this screen, with..." Read more

"The display is kind of small and dark. I have to face it squarely and shine a light on it to read it...." Read more

"...: plugs block the screen, lcd hard to read at most angles, it needs a backlight." Read more

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Top reviews from the United States

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Evangeline Blouin

Great product

Reviewed in the United States on March 27, 2024

Item Package Quantity: 1Color: WhiteVerified Purchase

Works great. Easy to use.

Helpful

D. Nov

Great Gauge!

Reviewed in the United States on February 1, 2024

Item Package Quantity: 1Color: WhiteVerified Purchase

I should have bought this a long time ago. I started saving money the first week I began using this gauge. It's easy to use and gives you great information. You'll be surprised where your excess electricity is going. This gauge will tell you. It's a must have for any homeowner!

Helpful

Dave E.

A Great Price for a Great Product

Reviewed in the United States on April 3, 2024

Item Package Quantity: 1Color: WhiteVerified Purchase

I never knew how useful this would be. I'm very happy with the performance. It should be a part of every technicians kit. Musicians could benefit from it too. I like this thing.

Helpful

brted

Neat Device - Could be better

Reviewed in the United States on November 5, 2009

Item Package Quantity: 1Color: WhiteVerified Purchase

This is a pretty neat device that measures how many watts a device is using and keeps a total of kilowatt hours used over time (critical for things that use power in bursts like a refrigerator). I used it to measure how much power my HDTV receiver was using while it was turned off (15 watts!) and calculated that by using a remote control surge protector and unplugging the HD receiver when not in use, I can pay for the surge protector in 3 years. I was happy to learn that the standby power of my DVD player and home theater receiver were minimal. My old VCR uses a couple of watts just sitting there. I figured out that it costs me 2 cents to brew one cup of coffee.

So this is a great thing 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! Let everyone audit their own energy use. Every library or fire station should have these to lend out to people. Okay, off my soapbox now.

The device itself needs some improvements. I know this is the low-end model and I appreciate that it is fairly inexpensive. But there is no reason in the world for this thing to block both plugs in a standard outlet. Yes, you can get an extension cord, but the design should be better. I was a little annoyed that it has three prongs, but I admit they probably don't have a choice since some devices that you plug in to it will need a ground. Second, just plugged in to the wall, the Kill a Watt reads 3 watts. While that is great to know, it totally messes up all the readings. My VCR on standby reads 5, but 3 of that is the Kill a Watt. Why do I want to know that? It should not be counting itself and I imagine that it also includes its own power usage in the kilowatt-hour running total. Memory and backlighting would be fine additions, but I don't really want to pay extra for them.

So I think it can be useful for tracking down energy vampires (my laptop uses one sixth as much power as my desktop computer; I don't think I'll buy another desktop). It would be best if you can find somebody and borrow this from them, but if not this is a good purchase.

One person found this helpful

Helpful

Mwp

Exceeded my expectations

Reviewed in the United States on January 25, 2024

Item Package Quantity: 1Color: WhiteVerified Purchase

I needed a device to determine whether a 10 lpm vs 5 lpm oxygen concentrator consumed a significant difference in electricity when both operating at 2 lpm. Worked great. Now I will use it on other systems in my house.

One person found this helpful

Helpful

dan lezzeni

Accuracy! Better than all others

Reviewed in the United States on February 11, 2024

Item Package Quantity: 1Color: WhiteVerified Purchase

I bought two other cheaper watt meters, they never read the same, or the same as my inverter. I bought this "Kill a Watt" and I am so impressed with ease of use and unequalled accuracy. Makes predicting usage over a day or week a breeze!

Helpful

Amazon Customer

Great information for seeing energy usage

Reviewed in the United States on March 10, 2024

Item Package Quantity: 1Color: WhiteVerified Purchase

Plug this in ND then appliance nd see how energy it is using. Great information if you want to see how energy efficient the item is using

Helpful

remote camper

Have a concern

Reviewed in the United States on September 17, 2019

Item Package Quantity: 1Color: WhiteVerified 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.

44 people found this helpful

Helpful

Top reviews from other countries

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Patrick Montague

Non UK product

Reviewed in the United Kingdom on November 22, 2022

Item Package Quantity: 1Color: WhiteVerified 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.

5 people found this helpful

Tlojm

Sencillo de usar

Reviewed in Mexico on February 23, 2018

Item Package Quantity: 1Color: WhiteVerified Purchase

Mide en tiempo real tu consumo. Te sorprenderás con algunos electrónicos que consumen aún apagados, así como cosas que consumen mucho y otras que no. Perfecto para el cálculo y/o control de tu consumo.
Al conectarlo te indica la salida de corriente, conectad algún aparato y te indica su consumo, e incluso sabrás los kwh desde que lo dejes conectado hasta que se desconecte.
Con los botones sabrás el voltaje, watts/vA, Hz, amperes y kw/h

10 people found this helpful

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Phil

Shouldn't Be Sold In Japan

Reviewed in Japan on January 19, 2021

Item Package Quantity: 1Color: WhiteVerified 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.

6 people found this helpful

Murray L. Vasilev

These meters just work!

Reviewed in Canada on October 6, 2023

Item Package Quantity: 1Color: WhiteVerified Purchase

I have a solar system at my remote cabin which has an inverter to provide AC power, it is imperative to know the electrical loads of my appliances and other devices. This meter does the trick. Unfortunately it does not measure peak power when motors and compressors start but that would require a much more advanced meter.

Rod

Not useable in UK

Reviewed in the United Kingdom on August 25, 2021

Item Package Quantity: 1Color: WhiteVerified 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.

27 people found this helpful

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P3 P4400 Kill A Watt Electricity Usage Monitor

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Empowers You to Save Hundreds on Electric Bills

Find Out How Much Electricity You're Using

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