Swimming Data - Apple Watch 2 v Fitbit 2

Discussion in 'Apple Watch' started by mbeaumont, Jan 31, 2017.


How accurate have you found the Apple Watch or Fitbit 2 for swimming

Poll closed Feb 14, 2017.
  1. Apple Watch 2 is the most accurate

  2. Fitbit 2 is the most accurate

  3. Nether are accurate

  1. mbeaumont macrumors newbie

    Oct 21, 2013
    Hi all,

    I am trying to loose weight and have taken up swimming.

    I've had an apple watch 2 since its release and been swimming since last November. So far I have only lost 2kg and wanted to check the Swimming Data (Calories)

    So, here are my stats

    I am 48, and my weight is
    92kg - 203 lbs
    My pool is 25 meters
    I generally swim breaststroke at 5'17 per 100m on average.

    Today I went to the pool with my Apple Watch 2 and the results were :-

    Active Calories = 665 Cal
    Total Calories = 717 Cal
    Distance = 1,020m
    Total Time = 0:54:03
    Avg Heart = 104 BPM

    I also had a Fitbit 2 on my other wrists

    The data from that is showing

    Total Time = 0:43:31
    Total Calories = 330 Cal
    Distance = 1,250m

    I was shocked to see the hue difference in calorie burn, so I went to some swimming calculator websites to check the approximate results

    Putting in to the website the Apple Watch Distances etc here were the results

    Suggested that 367 Calories had been burnt, learning towards Fitbit

    Suggested that 461 Calories has been burnt, again significantly lower than apples reading

    Suggest that 580 Calories has been burnt

    It is clear that something is amis here, and may explain why I am am not loosing weight if those numbers from apple are used as part of my daily calorie exercise total.

    Am pretty confused here, not sure which reading to take, apple or fitbit.

    Anyone else experienced this or maybe my watch is faulty?

    Mik - UK
  2. Newtons Apple, Jan 31, 2017
    Last edited: Jan 31, 2017

    Newtons Apple macrumors Core

    Newtons Apple

    Mar 12, 2014
    Jacksonville, Florida
    The numbers are all over the place no matter what you use. About the best you can do is use it as a guide and not depend on accuracy.
  3. PaladinGuy macrumors 6502

    Sep 22, 2014
    That's the biggest danger with fitness trackers and why studies often show that people gain weight with them. They're very helpful as a general gauge, but you can't do a one to one calorie count with them.
  4. The Doctor11 macrumors 603

    The Doctor11

    Dec 15, 2013
    New York
    I've found swimming with my Apple watch to be extremely accurate as long as all I'm doing is a basic swim (not just kicking or a swim drill). I swam 10,300 yards and my watch counted it as 10,325 yards.
  5. Thai macrumors 65816


    Feb 2, 2016
    Apple Watch takes into account your heart rate into their calorie measurements i think. Fitbit 2 may not be able to read the HR while in water. Your swim calculators the same...no HR data to input.

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