How to Use Galaxy Watch 4’s Body Composition Feature and Is It Accurate?

Nov. 16, 2021

The Samsung Galaxy Watch 4 continues to surprise us all. Dubbed as the true smartwatch Android users were waiting for, the Galaxy Watch 4 packs an impressive array of features. From a plethora ofGalaxy Watch Facesto usingSpotify offline, there is a lot to look forward to. However, one of the highlight features of the Watch 4 is the BIA sensor and its ability to keep your health goals on track by giving you a smart analysis of your body. But what exactly is this sensor, how do you use it, and is it actually accurate? This is exactly what we aim to find out and show in this in-depth guide about the Samsung Galaxy Watch 4’s body composition sensor and its usage.

Galaxy Watch 4’s Body Composition Feature

While this guide will show you how to measure your body composition through the Galaxy Watch 4, we will also talk about the Watch’s BIA sensor and what it does. If you’re already caught up with the basics and just want the h0w-to, use the table below to jump to the section.

For those not initiated to the immense features of the Galaxy Watch 4, the BIA stands forBioelectrical Impedance Analysis. Part of the wellness suite of the Galaxy Watch 4, the BIA sensor is responsible for checking a host of your health metrics. The Galaxy Watch 4’s sensor collects health data from over2,400 pointsand paints a virtual picture of your body composition including your body fat among other things. You will understand the experience if you’ve ever used a smart scale that requires you to place your feet over four metal sensors.

The BIA sensor of the Galaxy Watch 4 works in the same way and after a few seconds dishes out a slew of results you can use to monitor your health and fitness regime. However, the difference here is the Galaxy Watch 4 requires you to place two of your fingers to perform its process. The BIA sensor of the Watch 4 has proven to be an incredible tool and arguably the first of its kind not seen in smartwatches before. This spells incredible opportunity for fitness enthusiasts and makes the Galaxy Watch 4 a vital tool for health compromised individuals who need to keep a tab on their body vigorously.

Since the BIA sensor in the Galaxy Watch 4 measures your body composition, it works on the same principle as BMI scales. While there are different ways to measure a person’s body composition, Samsung’s newExynos W920chipset present in the Galaxy Watch 4 and Classic relies oncurrent resistance. The BIA sensor present in the watch requires users to position theundersideof their wrist opposite the watch and place theirmiddleandringfingers on the two buttons.

Post that, the watch sends a series oflow voltage currentsto the body which in a way act like a complete circuit starting from one finger and ending at the next. Since our body is made up of different impedances of fat, water, muscle tissue, and bone, this signal is affected by them as it passes through. The collected data is sent through Samsung’s own algorithms. This process takes around15 secondsto complete and at the end, users get the results comprising of their individual factors. Electrical analysis for measuring body composition has picked up a lot of steam in recent times and is used by an immense number of weighing scales.

However, a thing that should be made clear is the Galaxy Watch 4’s BIA sensor isincapable of measuring weight. At the beginning of your body composition test, you must input your current weight so the gathered results can be cross-run alongside it to spit out an accurate analysis. While you can go ahead and guess your weight and run the test, it’s heavily advised to keep a weighing scale handy so you input the proper data.

The Samsung Galaxy Watch 4’s body composition sensor analyzes and tests the most important factors related to your health. Besides body fat percentage which is prime for many users, the BIA sensor also measures other health-centric metrics such as:

As is evident, the Galaxy Watch 4’s body composition sensor provides an almost complete picture of a person’s body health along with other finer details. Individuals invested in losing weight or making themselves fitter can easily look up their Body fat and Fat Mass to stay healthy. If you’re the sort who has calories as prime key, the BMR result also shows you your basal calories so you can build upon them. Whereas, the BMI result compares weight against height and as mentioned, you need to have a weighing scale for that.

However, do keep in mind that Samsung has made people aware that the Galaxy Watch 4’s BIA sensor isnot intendedto detect, diagnose, or treat any medical conditions or illnesses. So while you can go ahead and measure your body composition, do not expect the watch to have pinpoint accuracy. We will talk more about that below.

When measuring your body composition metrics among other things, there are a few things that Samsung has declared users should keep in mind.

For starters, the company has recommended users measure their body composition at thesame time of the dayand in the morning to get accurate results. Before you go on placing your fingers, make sure you are on anempty stomachand have gone to thebathroom once. Users coming off a heavy workout or even a sauna should firstcool offas high body temperature can throw off your readings.

Note:If you have a cardiac pacemaker or any other electronic device inside your body,do notuse the Watch 4’s BIA sensor since there is a chance of malfunction.

Women arenot advisedto measure their body composition while having their menstrual period. Moreover, whilepregnant womencan use the Galaxy Watch 4’s BIA sensor, they should steer clear of it because of the chances of inaccuracy. Also, be sure to remove any metal objects like rings and jewellery from your body before you begin.

While these requirements do sound annoying, remember that measuring finer details of your body composition is a complicated process, and try crossing these off as necessary needs. However, the good news is that actually using the BIA sensor is a lot easier than it sounds and only has a few position pointers you should keep in mind. Keep reading to learn how to measure your body composition using the Galaxy Watch 4.

Measuring your body composition using the Watch 4’s BIA sensor and is easy and only takes under 15 seconds. However, before we teach you how to do that, make sure the points below are clear.

With that in mind, follow the steps below.

1. With the watch on your wrist, unlock it and make your way toSamsung Healthfrom the app list.

2. TapBody Compositionto get to it.

3. TapMeasureto begin the process.

4. The watch will require you to input your weight, height, and gender so do so.

5. Place yourmiddleandringfingers on theHomeandBackkeys to begin.

6. Do not move and wait for15 secondsuntil the results are displayed.

Once done, you can read the results and infer your conclusions accordingly. These results can serve as a benchmark and you can continue to retake the measurement if you wish.

While body compositions scales, in general, have a 1 to 2% of error rate, the Samsung Galaxy Watch 4’s BIA sensor is pretty accurate. As someone who has usedMi’s Body Composition Scalefor the better part of a year, I decided to measure my body composition across both the devices and cross-compare. Wiping both the devices clean, I measured my body composition twice to get an accurate list of results.

As you can deduce yourselves, the results overlap each other while remaining in the same ballpark. Metrics like my body fat and fat mass overlap each other with the Galaxy Watch 4’s BIA sensor showing anincreased difference of over 5%. The smartwatch also places my Basal metabolic rate at1539 caloriescompared to Mi’s scale of 1736. A difference of almost 200 calories while not a big one is still a difference. My BMI remains consistent but that’s because of the calculation made while comparing my height and weight.

From my own composition experience I can infer that while the Galaxy Watch 4’s BIA sensor is fairly accurate at pointing out my body’s metrics, it is not suitable to be used to get the exact specifics. So if you’re a smartwatch user trying to leverage this new BIA sensor, make sure you use itonly periodicallyinstead of making this a daily regimen. Moreover, since the Samsung Galaxy Watch 4 is the new kid on the block, it is natural that it will receive many updates over time which might add tweaks andimprovementsto the BIA sensor’s software and to Samsung’s algorithm. However, as things, for now, I will alternate between the Mi scale and watch while only using the latter as a reference instead of concrete proof.

As discussed above, no it does not. The Galaxy Watch 4’s sensor requires users to input their weight each time they are measuring their body composition. This is due to Samsung’s own algorithms which run your manually entered weight against the data to give you an accurate result.

While you’re right in being careful about microcurrents going through your body, rest assured the BIA sensor will not harm your body. The voltage that runs across your body is very minor in nature to the point you won’t even feel it.However, as mentioned above, individuals with cardiac pacemakers or other electronic equipment should hold off on using the BIA sensor and instead refer to their cardiologist first.

It is not advised you measure your body composition regularly. Since overall body composition is something that takes weeks to change, daily measurements will only confuse your long-term goals. Moreover, other factors like the time of the day and your hydration state might also influence the results thereby making them unreliable.

From what we have gathered right now, no it will not. Since the Galaxy Watch 4’s body composition sensor is proprietary, it requires the officialSamsung Healthapp to function. Any attempts at using third-party apps for the BIA sensor put this at your risk and might cause damage to the hardware.

While there is a low chance of children being harmed by a body analysis, it is not recommended they use the Galaxy Watch 4’s BIA sensor to measure their body composition. To clarify this point further, Samsung has even said that readings for individualsunder 20 yearsof age might not be accurate.

Yes, they can but perhaps they shouldn’t. Attempting to measure your body composition while pregnant will not provide you with accurate results as there are other factors involved.

We hope the above guide proves useful in breaking down the Samsung Galaxy Watch 4’s body composition sensor. While you can go ahead and buy the Galaxy Watch 4, thesebest smartwatchescan take your fancy if Samsung isn’t an option. Mi users looking for something good and affordable can go for theMi Smart Band 6which is now available worldwide. Have any more questions about the Galaxy Watch 4? Ask them in the comments below.

Combining his love for Literature and Tech, Upanishad dived into the world of technology journalism with fire. Now he writes about anything and everything while keeping a keen eye on his first love of gaming. Often found chronically walking around the office.