Can Apple Watch Measure Calories Burned. Use the Activity app on your Apple Watch - Apple Support. Its just the way the body works.
Different people have different bodies. First the Apple Watch like virtually every other fitness tracker doesnt measure calories accurately. While a medical device such as a calorimeter may be better at tracking calories used the Apple Watch is close to being the best device to track calories burned and heart rate.
Some people can burn calories easier than others for a variety of reasons such as age size gender height etc.
It also tracks your hydration over two weeks. It is crucial however that your watch is set up correctly to ensure that calories are tracked as precisely as possible. Mine fluctuates between about 1800-2000 a day. If you transition to an Apple Watch from another wearable like Fitbit you might be a bit confused by the new calorie burn counter.
