Apple Watch - Indoor Run : Not Calculating Distance Run Properly

I've had every version of the Apple Watch, I love them. Since Apple released the Fitness App and the ability to track distance, in mile run, it has NEVER been accurate on ANY of the watches I've owned. Let me explain:


I run both Indoors, on a treadmill, and outdoors, mostly on paths. My indoor runs, I start at 6 mph and raise the speed, in increments of .1, every quarter mile. I generally run 4.5 miles, every other day. When I use the fitness app on the Watch, it will calculate the correct distance I've ran, up to 6.2 mph. When I start to trek up in speed, the Apple Watch does NOT keep up and calculate the distance I've covered. It seems like the faster I run, the less distance the Watch will report. For instance, today and most every day, I ran 4.6 miles, the Apple Watch said I only ran 3.97 miles. So were looking at .6 mile difference, from the treadmill to the Watch.


This happens regularly, and with every Apple Watch that I've owned, and I've owned them ALL. I've researched this up and down and most say, calibrate the watch while running outdoors, delete you data and start over, first running outdoors, for a period of time. Well, I've done this, numerous times to NO avail. I've run on 30 different treadmills and its always the same. The faster I run, the more distance I cover, the apple watch just cant keep up. If I ran at 6mph and just at that speed the entire run, the Watch will calculate the distance properly. The problem is it cant keep up with faster speeds, at all.


Anyone else experience this problem? I guess you would have to run at speeds of 6.5 mph or greater to give an answer, but hoping there are other fitness runners out there who have experienced this?

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Posted on May 10, 2023 03:00 PM

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Posted on Feb 25, 2024 07:27 AM

Not all treadmills have the Apple Watch connectivity. If they do, then there is no problem. But the connectivity only solves the problem for that treadmill. It doesn't solve the indoor inaccuracy of the Apple Watch. Not that anything on this thread or any thread will solve it either. GymConnect helps fill the gap until Apple fixes the failed tech, or opens the option to edit the distance.

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Feb 25, 2024 07:27 AM in response to LD150

Not all treadmills have the Apple Watch connectivity. If they do, then there is no problem. But the connectivity only solves the problem for that treadmill. It doesn't solve the indoor inaccuracy of the Apple Watch. Not that anything on this thread or any thread will solve it either. GymConnect helps fill the gap until Apple fixes the failed tech, or opens the option to edit the distance.

Dec 11, 2023 10:26 AM in response to RJ Chi

Indoor Run (on a treadmill) with Apple Watch is unusable. It's a known flaw that cannot be corrected by the user. I've ran dozens of times, on dozens of different treadmills, while using my Apple Watch AND holding my iPhone. The results are Apple Watch is consistently 10-15% below the treadmill distance. The iPhone indoor runs are within 1-3% accuracy of treadmill distance. This includes the iPhone being +/- on measurement. Apple Watch errors are only on the (-) low side. For example, I ran 3.10 miles on treadmill; Apple Watch measured 2.71 miles; iPhone measured 3.11 miles. Outdoor runs are a different story...deadly accurate on both Watch and iPhone.


Recalibrating does nothing other than create false hope. Sorry for the bad news.

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Apple Watch - Indoor Run : Not Calculating Distance Run Properly

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