R.M. Williams Men’s Boot Size Guide

R.M. Williams Men’s Boot Size Guide

R.M. Williams men’s boots use Australian/UK footwear sizing and are available in a range of width fittings:

  • F – Narrow

  • G – Regular

  • H – Wide

  • X – Extra Wide

For the best fit, measure both feet while wearing the type of socks you would normally wear with your boots. Measure from the back of the heel to the tip of the longest toe, then measure around the widest part of the foot.

Use the measurements of your larger foot when selecting your size. If you fall between two sizes or fittings, R.M. Williams recommends choosing the larger option.

AU/UK EU US Men’s Foot Length (cm)
3 35 4 22.6
3.5 36 4.5 23.0
4 36.5 5 23.4
4.5 37 5.5 23.8
5 38 6 24.2
5.5 38.5 6.5 24.7
6 39 7 25.1
6.5 40 7.5 25.5
7 41 8 25.9
7.5 41.5 8.5 26.3
8 42 9 26.8
8.5 43 9.5 27.2
9 43.5 10 27.6
9.5 44 10.5 28.0
10 45 11 28.4

Width fittings

  • F — Narrow
  • G — Regular
  • H — Wide
  • X — Extra Wide

R.M. Williams states that each fitting within the same size varies by approximately 0.64 cm / ¼ inch in foot width.