Is my connected watch’s step calculation correct?

The announced statistics are relatively correct. It is still important to know that on all connected watches, the step calculation is based on the movements of your wrists. Based on your wrist movements, the watch estimates your activity level in the form of steps. The connected watch counts steps using a “3-axis G-sensor” which calculates them using the oscillation of your wrist, the angle of oscillation being 45°. Maybe try it once or twice by “exaggerating” your movements to see if a difference is visible.