![]() They can only make an estimate based on the accelerometer and heart rate data and their algorithm. It would be i mpossible for your smartwatch to be 100% correct in how many calories you have burned during your activity because they don’t ever measure calorie burn directly. The calorie burn estimate you get from your fitness band, or standalone smartwatch will only ever be that – an estimate. How accurate are smartwatches calorie data? Their watches are then trained using this data to calculate calorie burn as accurately as possible. Similarly, Apple conducted a study using 10,000 people’s metabolic profile.Īpple measured the study participants’ calorie expenditure using metabolic gas measurements (which is precise) and then correlated that with their heart rate and movement data. For example, Fitbit has stated that they use AI, machine learning, and a database full of biometric data from a wide range of people to design their calorie calculator algorithm. The exact formula that is used varies depending on the company and is generally kept pretty secret. They will also use their heart rate monitor to see how fast your heart is beating (the faster the heart rate, the more calories you burn on average). Smartwatches tend to use their inbuilt accelerometer to measure your movements (this is also how they count your steps). It can be anything from walking up the stairs to housework to a HIIT training session. It is the amount of energy you use when you do anything other than sitting and doing nothing. Once your smartwatch has your BMR, it can then calculate your active energy expenditure. For example, men tend to have a higher BMR than women, and larger people have a higher BMR than smaller people. ![]() The number of calories you burn when you aren’t moving around varies quite a lot, depending on those factors you input into your account. So even if you are sat on your couch watching TV, you are burning calories. This includes breathing, digestion, and blinking. Remember that everything your body does uses energy. It is using it to calculate your base metabolic rate (BMR). The company behind your smartwatch isn’t just collecting this information for fun. Whenever you create your account for your smartwatch or activity tracker, it will ask you for some necessary information. Now we have covered why it is essential to measure the calories you use, let’s look at how smartwatches achieve it. You can easily track the calories you eat by using a calorie tracker, but a smartwatch can be very useful in tracking the number of calories you have used. So, if you are trying to lose weight, you will need to keep track of the number of calories you are taking in from your food and the number of calories you are using up. When you regularly consume too many calories, this can lead to weight gain. And what your body cleverly does is store it as fat so that it can be used at a later date. Whenever you consume more calories than you use, that energy has to go somewhere. The focus on calories in weight loss comes about because excess calories are the driving force behind weight gain. Why are calories important for weight loss? So you are undergoing a constant energy transfer from your food to your body. Every piece of food you eat contains calories, and every part of your body uses calories to function. They are 1,000 of these little calories each and so are sometimes referred to as kilocalories. It is known as a small calorie and is different from the calories you see on your food labels. Still, generally, a calorie is the amount of heat that’s needed to raise the temperature of a gram of water from 14.5 degrees celsius to 15.5 degrees. There have been a variety of methods used to define a calorie over the last century. What are calories?Ī calorie is a unit of measurement. But have you ever sat back and wondered how exactly Apple, or Fitbit, or Garmin are managing to calculate the calories you are using? It is not quite as simple a task as it can first appear. In particular, their ability to track our activity and measure how many calories we have burned. ![]() Smartwatches can perform various tasks, but the key feature for many people is how they can help us reach our fitness goals. You are probably wearing one right now, or at least have someone close to you who wears one. The world of tech wearables has exploded in recent years and, by far, the most popular option has in the realm of smartwatches and activity trackers.
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