Width & Fit Guide
Measure your foot length and the width across the ball of your foot, and get the standard width letter — from AAA (narrowest) to EEE (widest) — that matches.
Width class
Standard medium for men's. Not every brand stocks every width letter, and the same letter can fit differently between brands — use this as a starting point, not a final answer.
The width-to-length scale
Footwear width isn’t measured in absolute centimetres the way length is — a 9cm-wide forefoot is wide on a short foot and narrow on a long one. Instead, fitters express the ball-of-foot width as a percentage of foot length, and that percentage is what actually determines the letter: roughly 37.5% lands on a standard men’s D, and roughly 33.75% lands on a standard women’s B.
This calculator applies that same ratio across the full nine-letter scale, so it works the same way regardless of whether your foot is small or large — what matters is the shape, not the size.
Frequently Asked Questions
What do the width letters AAA through EEE mean?
They're a standard nine-step scale running from AAA (narrowest) through AA, A, B, C, D, E, EE, to EEE (widest). D is the conventional standard/medium width for men's shoes, and B is the conventional standard/medium width for women's shoes — so a men's D and a women's B both mean 'about average,' just on different base sizes.
How is the width letter actually calculated?
Footwear fitting devices measure the width of the ball of the foot straight across — its widest point, at the base of the toes — and express it as a percentage of foot length. Each width letter corresponds to a fixed percentage band, spaced about 1.9 percentage points apart, from roughly 28% at AAA up to roughly 43% at EEE. This tool applies that same percentage scale to your two measurements.
How do I measure my ball-of-foot width?
Stand on a sheet of paper with your weight on the foot. Hold a pen upright and mark each side of the widest part of the foot, at the base of the toes, then measure straight across between the two marks. Do not wrap a tape around the foot: that measures girth, which is close to the foot's whole length and is not what the width letters are built on. Measure both feet and use the larger figure.
Why doesn't every shoe come in every width?
Manufacturing every width letter for every style is expensive, so most mass-market shoes are only made in medium (D for men's, B for women's), sometimes with a wide option. Specialist and orthopedic-adjacent brands are more likely to stock narrow and extra-wide options if your measurement lands away from the middle of the scale.
General fit guidance only, not a professional fitting or medical assessment. If you have foot pain or a medical concern, see a podiatrist rather than relying on this tool.