Length: Stand on paper against a wall. Mark the longest toe and heel.
Measure the distance in millimeters. Average men: 260-280mm, women: 235-255mm.
Width: Wrap a tape measure around the widest part of your foot (ball area).
Or trace your foot and measure the widest point. Average men: 95-105mm, women: 85-95mm.
Adding width gives you personalized width recommendations per brand!