Accuracy issue with Apple Watch Series 12 step and distance tracking

I’m experiencing accuracy issue with step and distance tracking on my Apple Watch Series 12 OS 27

Previously, I used the first-generation Apple Watch SE and almost for a year I consistently walk for 10,000 steps per day. Based on my experience with the SE, 10,000 steps typically corresponded to around 6.5 km.

However, with Series 12, I’m getting a significant difference it takes approximately 12,000 steps to reach 6.5 km.

I think watchOS 27 may have changed the step-counting algorithm, or the way steps are detected has changed.

Apple Watch Series 12, watchOS 27

Posted on Sep 20, 2026 5:10 AM

Top-ranking reply

Ingo2711

Community+ 2026

Level 10

92,629 points

Posted on Sep 20, 2026 5:30 AM

Some users reported similar issues when they started to use the new Apple Watch 12 or Ultra 4.

Apple introduced a new algorithm to estimate steps and distance during a workout in watchOS 27.

The watch will deliver better results again over time after a calibration and multiple workouts.

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

View in context

22 replies

GBPack13

Level 1

44 points

Nov 4, 2026 4:51 PM in response to GBPack13

Here are my latest inaccurate numbers. I was walking with a friend who has an earlier model Apple Watch and we were together most of the day her numbers were 17,774, 7.92 miles and 39 flights. Every time I walk outdoors, the watch comes on asking if I want to record an indoor walk. Come on Apple fix this.