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P3 P4400 Kill A Watt Electricity Usage Monitor

4.6 4.6 out of 5 stars 9,600 ratings
$30.00 with 25 percent savings
List Price: $39.95

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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

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Customer ratings by feature

Easy to use
4.8 4.8
User interface
4.8 4.8
Value for money
4.7 4.7
Energy efficiency
4.6 4.6
See all reviews

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

User Manual (PDF)

Looking for specific info?

Product information

Technical Details

Additional Information

Warranty & Support

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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.

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Price-25% $30.00
List: $39.95		$17.99-6% $15.99
List: $16.99		$9.99$11.99$43.95
Delivery
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Get it as soon as Thursday, Aug 22
Get it as soon as Thursday, Aug 22
Get it as soon as Thursday, Aug 22
Get it as soon as Thursday, Aug 22
Get it Aug 22 - 26
Customer Ratings
4.64.6 out of 5 stars9,600
4.74.7 out of 5 stars413
4.34.3 out of 5 stars72
4.34.3 out of 5 stars767
4.54.5 out of 5 stars949
4.04.0 out of 5 stars46
Value for money
4.7
5.0
3.6
4.9
4.6
—
Accuracy
4.5
4.5
3.6
4.2
4.4
—
Easy to read
4.3
4.5
4.0
3.3
4.6
—
Easy to use
4.8
—
—
4.1
4.4
—
Sold By
Timers Plus
Ketotek
SURAIELEC
BN-LINK
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Timers Plus

Important information

Legal Disclaimer

Warranty does not cover misuse of product.

Bulb Voltage

115 volts

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Customer reviews

4.6 out of 5 stars
9,600 global ratings

Customers say

Customers like the appearance, ease of use, accuracy, and value of the tool. For example, they mention it's a nice looking device, it helps troubleshoot and answer some questions, and it accurately measures the electricity usage of any appliance. That said, some disagree on readability, and electricity.

AI-generated from the text of customer reviews

Select to learn more
PerformanceAccuracyEase of useQualityValueAppearanceReadabilityElectricity
1,759 customers mention "Performance"1,577 positive182 negative

Customers like the performance of the tool. They mention that it works well, the circuit works great, and is very useful to understand electronic systems. Some say that it's a fun nerd-ish toy, but a solidly useful tool that will save them enough power. Overall, most are happy with the performance and find it to be a great little gadget.

"...(I pay the utilities in the building) This works well for everybody." Read more

"Great tool works perfect. The prices a little high there’s other models that are below half the price sorry but no thank you." Read more

"...The measurements seems ok and are very useful but the display is terrible. If you are in an even slightly dark area you can’t read the display...." Read more

"I use it to monitor total pc power drawit works well" Read more

997 customers mention "Accuracy"910 positive87 negative

Customers are satisfied with the accuracy of the product. They mention that it is especially good for monitoring energy usage while the equipment is on standby, and it is most useful when investigating electrical power usage and verifying the power consumption of appliances. It reads wattage and cumulative kWh, and tells you kWh and time of use, plus other useful numbers such as current (A), power, and is a neat tool for assessing energy efficiency. It also tracks the cumulative electricity used from the point you plug something in, and can inform energy use.

"Exactly as advertised. You can see watts, amps and volts. I've plugged this thing into so many devices to see it's power draw!..." Read more

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

"You can check your watts being used." Read more

"...and simple operation, this device allows you to accurately measure the electricity usage of any appliance...." Read more

782 customers mention "Ease of use"626 positive156 negative

Customers find the tool very simple to use and enlightening. They say the settings and buttons make sense and the display is easy to read. Customers also say the tool has helped them troubleshoot and answer some questions.

"I like the simplicity of use. It looks like a brick, money well spent. Instant reading...." Read more

"...With its easy-to-read display and simple operation, this device allows you to accurately measure the electricity usage of any appliance...." Read more

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

"...Anyway, that said, it appears to work well. It's easy to use which is good because the "instruction manual" wouldn't be very helpful if it wasn't...." Read more

655 customers mention "Quality"538 positive117 negative

Customers like the quality of the tool. They say it's surprisingly useful, easy to use, and gives great information. They also say it provides some other useful functions, like instantaneous voltage measurement, and it makes for an interesting experiment. Customers say it reveals some interesting facts about appliances and helps provide incentive to take action. However, some customers have reported drawbacks with the product.

"...There are many functions that you can go through." Read more

"...I think this gadget has potential for being useful...." 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 really helps provide incentive to take action.The device itself has its drawbacks...." Read more

459 customers mention "Value"413 positive46 negative

Customers like the value of the tool. They say it's a useful tool that justifies the price. They also say it comes in handy when evaluating power and is an easy way to save money.

"I like the simplicity of use. It looks like a brick, money well spent. Instant reading...." Read more

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

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

186 customers mention "Appearance"142 positive44 negative

Customers like the appearance of the tool. They say it's a nice looking device, neat, and cool. They also say it has a rich display and the LCD has nice contrast.

"I like the simplicity of use. It looks like a brick, money well spent. Instant reading...." Read more

"...Very rich colors and just an excellent unit. Well the age showed up on the monitor as it was pulling 150-180 watts...." Read more

"This watt monitor does everything it says. It was fun to go around the house and test things to see how much juice it draws, even when supposedly in..." Read more

"...it is also very dated looking, like it belongs in the early 90's from an aesthetic point of view...." Read more

346 customers mention "Readability"110 positive236 negative

Customers are mixed about the readability of the tool. Some mention that it's easy to read and understand, with clear numbers and a clear display. However, others say that the design is outdated and the display is difficult to read in low light and from an angle.

"...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

"...The measurements seems ok and are very useful but the display is terrible. If you are in an even slightly dark area you can’t read the display...." Read more

"...It looks like a brick, money well spent. Instant reading. The only thing I wish it did was have a light up display not super bright...." 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

158 customers mention "Electricity"89 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 perfectly adequate to demonstrate the power savings. However, others say that it registers zero Watt or AMP, and stops drawing any significant power once it is at pressure.

"...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

"...It has the potential to help eliminate old inefficient devices." Read more

"...5- It does not have internal power, a second of disconnection will ruin all your accumulated measurement.My conclusion:..." Read more

It works fine
4 out of 5 stars
It works fine
It's definitely worth buying if you want to know how much something uses electricity. It's a simple device, full of information when it's used.Once you know the information, it's adds to the office decor.I did find out my office PC and it's two monitors are energy hogs and in a month it is probably 33% of my electricity costs, yikes!
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Top reviews from the United States

Howard Romero
5.0 out of 5 stars they work for my use.
Reviewed in the United States on August 5, 2024
Item Package Quantity: 1Color: WhiteVerified Purchase
I allow my tenants to have an AC unit only if they use a power counter like this. i then bill them for the power used at the end of the month. (I pay the utilities in the building) This works well for everybody.
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Dani
5.0 out of 5 stars great little unit
Reviewed in the United States on July 23, 2024
Item Package Quantity: 1Color: WhiteVerified Purchase
This watt monitor does everything it says. It was fun to go around the house and test things to see how much juice it draws, even when supposedly in the off position. I was able to use it to tell me how big of an inverter I'd need for my travel trailer based on the load of each item I was hoping to use with the inverter. I can recommend this product.
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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: 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.
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Daniel C. Richards
4.0 out of 5 stars Great little gadget.
Reviewed in the United States on December 2, 2015
Item Package Quantity: 1Color: WhiteVerified Purchase
Love this little guy, combined with something else I will get to in a minute will quickly pay itself off in a matter of months. If I had any complaints it would be 2 things:
1. when plugged in it blocks the other outlet on the plug so if you have limited outlets in a room it could be an issue
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

it is also very dated looking, like it belongs in the early 90's from an aesthetic point of view.

after a month or 2 of using this I have been able to test virtually every appliance I use (outside of the dryer and water heater, since they operate off of 230/240 volt), my toaster oven that is large enough to fit a Tombstone brand (or any other brand for that matter) frozen pizza uses around 1100 watts in the normal baking mode (with the convection fan running) and about 1400 with in toast mode (with the upper heating elements on) my 1000 watt microwave (Hamilton Beach brand from walmart) uses 1700 WATTS on high and this is where I learned something interesting, as you approach the upper threshold of what this meter is rated for (1800 watts) it begins to beep warning you to watch your power usage so you don't fry it, my wireless router and cable modem use about 12 watts and my 50" LED 4k TV uses around 110 watts, but if I enable the energy saving options that really just dim the back light I can get it down below 70 watts and my new HE LG washing machine uses less then 2 cents of electricity per load (0.1 something Kw) which frankly surprised me, your dryer is the power user there everybody (fyi, they several Kw per load to run a dryer). This has also allowed me to test the actual consumption of my LED light bulbs, the GE 10.5 and 11 watt (60 watt equivalent) bulbs actually use around 13 watts and the Utilitech (Lowes brand) 9 watt (60 watt equivalent) use exactly 9 watt and the 5.5 watt (40 watt equivalent) actually use 5.1-5.2 watts, also ALL incandescent bulbs I tested used MORE then listed wattage, 65 watt flood bulbs used 67 watts, 100 watt shop light used 106 watts and so on.

I currently live alone and as such I am able to really track the whole house usage, my power company has a daily usage bar graph that I track in an excel spreadsheet to monitor usage. Currently I have turned off the central air and am using a propane powered wall mounted space heater for heat so I have a very steady power consumption of 8-9 Kw a day (with no dishwasher or dryer running days and a caveat I will get to in a minute) as monitored on the power company website of which I have established the older side by side fridge in the basement apartment (where I am staying) is using 2.6 Kw per day, the way I reached this average is to leave the killawatt connected for several days and divide total usage by number of hours plugged in, since fridges cycle on and off the longer you leave it hooked up the more accurate it gets, I find 1-2 days is enough to get a good number and the fridge in the vacant upstairs unit uses 1.3 Kw per day, so between the 2 fridges I have accounted for nearly half my power usage in a typical day. using my math skills I have estimated my daily person usage (tv, internet, laptop, cooking and lighting) to be around 2.5Kw so this leaves 1.5-2.5Kw un-accounted for that would have to be attributed to the hot water heater and the LED displays on kitchen appliances and the garage door opener backlight.

Now for the big power hog, this house had a concrete sidewalk installed upstairs that VIOLATES building codes and causes a fairly major issue, the top of the sidewalk is about 2 inches below the top of the foundation wall (code minimum is 8" above grade for top of wall) and worse yet it was poured after construction and as a result doesn't have proper support underneath and so it has begun sagging and slopping toward the house which results in extremely high humidity in the basement room on the other side of that wall that requires running a dehumidifier most days of the week, now this is the big deal and a REAL EYE OPENER, that this little kill-a-watt showed me, when in operation the dehumidifier (despite being energy star rated) uses 400+ WATTS, if left running all day it can use upwards of 10Kw a day BY ITSELF, this is more then EVERYTHING else in the house combined (thanks to my energy saving methods) so seeing this I went out and bought a 10 dollar digital thermometer/humidistat so I can monitor the actual humidity level in the room and power the dehumidifier off and on as needed as the humidity setting on the unit is virtually useless, once it reaches the set humidity it just goes into a fan only mode that still uses like 200 Watts, so it's better to just shut it off, with this meter I can monitor how much power the dehumidifier uses a day and the humidistat shows me when I need to run it, so instead of DOUBLING my power bill by doing like my parents did when they where living here (they moved to Florida and I moved in to watch over the house while it's on the market) and leave it running 24/7 I was able to shave over a 100Kw off my monthly usage and thats not even accounting for the 6 days I didn't monitor usage and at about .11 cents per Kw (with all fees factored in) I've already saved the cost of the Humidistat/thermometer and in the next month or 2 will save the cost of this guy. I will soon be addressing the sidewalk issue by removing it and laying a paver walkway that still leaves room for proper drainage. As is even with 5 days of not using the dehumidifier at all and 6 days of not monitoring it the dehumidifer accounted for 20% of the overall power usage (likely much higher due to the missing days).

If your power bills are high even when you don't have the A/C or heat going then get you one of these and find out what is costing you money. For me the biggest offender is the Dehumidifier followed by the side by side fridge (which is way to much for 1 person), my total power usage for November was 531 Kw, 112 Kw of that was the MONITORED usage of the dehumidifier and like 80 Kw was the fridge, so for black friday I bought myself a new smaller fridge that I will use and disconnect the bigger one, the new one should use 1/3 the power of the old one saving me about 6 bucks a month.
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BigD
5.0 out of 5 stars Works like it is supposed to
Reviewed in the United States on August 2, 2024
Item Package Quantity: 1Color: WhiteVerified Purchase
You can check your watts being used.
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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: 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.
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Jorge
5.0 out of 5 stars Excelente producto.
Reviewed in Mexico on August 1, 2018
Item Package Quantity: 1Color: WhiteVerified 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: 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.
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Murray L. Vasilev
5.0 out of 5 stars 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.
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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: 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.
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