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largobob

Level 1 (21 points)

iPhone 15 and Apple Watch 9 measure walk distance 12-13% less after iOS 27 update

I recently updated my iPhone 15 and my watch 9 to iOS 27. Since I did this, it is measuring distance of walks about 12 to 13% less. The steps are still reasonably accurate. I do not see any changes in other data in my settings. Obviously my walking time per mile has increased from about 16.5 minutes per mile to about 18.5. Any body else experience this?

Posted on Sep 18, 2026 6:47 AM

4 replies

Ingo2711

Level 10 (93,009 points)

Sep 18, 2026 9:36 AM in response to largobob

Some users report that the watch is registering more distance while Running or Walking outdoors in iOS 27.

Outdoor Run distance increased after upda… - Apple Community

The only solution given in these discussions was, calibrating the watch for workouts a couple of times:

Calibrate your Apple Watch for improved Workout and Activity accuracy - Apple Support

largobob Author

Level 1 (21 points)

Sep 21, 2026 7:53 AM in response to largobob

I did the recommended steps outlined above and on apple support but they were no help. I had previously restarted the iwatch also. This morning I shut down the watch, shut down the paired iphone, restarted the iphone, then restarted the watch. That seems to have solved the issue.

Jeff Donald

Level 9 (64,078 points)

Sep 18, 2026 2:52 PM in response to largobob

I was experiencing the same thing after updating on Monday. It took 5 days of workouts but it’s now with about 100 feet of the previous distance. If you just updated I'd give it a few more days.

Jeff Donald

Level 9 (64,078 points)

Sep 21, 2026 7:59 AM in response to largobob

That’s good to hear!

Originally posted at discussions.apple.com/thread/256359635