Activity app on iPhone
what is the length of a step?
Apple Watch Series 4, watchOS 6
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I believe it automatically figures out your stride length based on gps feedback.. I'm not sure if they actually tell you what that distance is. Can always kinda back calculate by looking at your step count before a work out, then go for an 'Outdoor Walk' for a bit. When done look at the workout distance an and divide by step difference.
Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support