Shoe Width Codes Explained
The complete guide to every shoe width letter, number, and abbreviation you’ll encounter — what each code means, why the same width has different names across brands, and how men’s and women’s codes compare.
Shoe width codes are one of the most confusing aspects of buying shoes. A “D” means something completely different for men and women. A “2E” and an “EE” are the same thing written two different ways. Some brands use letters, others use words like “wide” or “narrow,” and others use X combinations like “XW” or “XXW.” And most shoes have no width marking at all.
This guide covers every width code you’ll encounter, explains why the same width gets different names, and gives you a single reference to decode any shoe width label you come across.
If a shoe has no width marking at all — on the box, the tongue label, or the product listing — it is standard medium width. For men that is D. For women that is B. Manufacturers only mark non-standard widths. This is why most people don’t know their shoe width — they’ve only ever bought unmarked standard-width shoes.
The Complete Width Code Reference
Every shoe width code from narrowest to widest, for both men and women, with all known alternate names.
| Code | Men’s Category | Women’s Category | Also Written As | Notes |
|---|---|---|---|---|
| AAAA / 4A | — | Extra Extra Narrow | 4A | Extremely rare — custom only |
| AAA / 3A | Extra Narrow | Extra Extra Narrow | 3A | Very rare — specialty retailers |
| AA / 2A | Narrow | Extra Narrow | 2A, N (women’s) | Available from select brands |
| A | Extra Narrow | Narrow / Slim | S, N, Slim | Limited availability |
| B | Narrow | Medium / Standard ★ | M, R (women’s) | Standard women’s width — often unmarked |
| C | Semi-Narrow | Semi-Wide | — | Uncommon — few brands use C |
| D | Medium / Standard ★ | Wide | M, R (men’s) / W (women’s) | Standard men’s width — often unmarked |
| E | Wide | Extra Wide | W (men’s) / XW (women’s) | Widely available from most brands |
| EE / 2E | Extra Wide | XX-Wide | EE, 2E, XW (men’s) / XXW (women’s) | Available from New Balance, Brooks, Saucony |
| EEE / 3E | XX-Wide | XXX-Wide | EEE, 3E, XXW (men’s) / XXXW (women’s) | Specialty brands — New Balance, OrthoFeet |
| EEEE / 4E | XXX-Wide | — | EEEE, 4E, XXXW | New Balance, OrthoFeet, Propet |
| 5E | Therapeutic Wide | — | 5E, XXXXW | Diabetic/orthopedic brands only |
| 6E | Therapeutic X-Wide | — | 6E, XXXXXW | OrthoFeet, Propet, Apex — medical use |
★ Standard medium widths — D for men, B for women. Shoes with no width marking are these widths.
Visual Width Code Guide
A quick visual reference showing where each width falls on the spectrum from narrowest to widest.
Why Men’s and Women’s Codes Mean Different Things
This is the single biggest source of shoe width confusion. The same letter designates a different position on the width spectrum for men and women. The reason is physiological — men’s feet are proportionally wider than women’s feet, so the scale is calibrated differently for each gender.
| Width Code | For Men It Means | For Women It Means |
|---|---|---|
| B | Narrow | Medium / Standard ★ |
| D | Medium / Standard ★ | Wide |
| E | Wide | Extra Wide |
| 2E / EE | Extra Wide | XX-Wide |
Many running and athletic shoes are sold as unisex. When a unisex shoe is marked “D width,” it means medium for a man but wide for a woman. A woman who buys a unisex “D width” shoe thinking it’s standard may end up in a wide shoe. Always confirm which gender’s sizing standard the shoe is built to before ordering.
How Each Width Increment Translates to Actual Measurement
One of the most useful things to understand about shoe widths is that each step from one width to the next adds a consistent amount — approximately one-eighth of an inch, or about 3 millimeters, at the ball of the foot. This sounds small, but it makes a real difference across the sensitive ball-of-foot area.
| From This Width | To This Width | Difference | In Plain Terms |
|---|---|---|---|
| D (medium) | E (wide) | +1/8″ | About the thickness of two credit cards |
| D (medium) | 2E (extra wide) | +1/4″ | About the thickness of a pencil |
| D (medium) | 4E (XXX-wide) | +3/8″ | Roughly a third of an inch wider |
| D (medium) | 6E (therapeutic) | +5/8″ | More than half an inch wider |
These differences seem modest but the ball of the foot is a high-pressure zone concentrated in a small area. Even 1/8 inch of extra compression across that zone over the course of a day adds up to significant cumulative pressure — which is why getting the width right makes such a noticeable difference in comfort.
Why Brands Use Different Codes for the Same Width
There is no industry-wide standard for shoe width labeling. Each manufacturer can label widths however they choose. This is why you’ll see the same physical width written as “2E” by one brand, “EE” by another, “XW” by a third, and simply “Wide” by a fourth. They all mean the same thing.
The inconsistency developed because shoe manufacturing has always been fragmented across many countries and traditions, each with their own conventions. American brands historically used the letter system (A through E). British brands used their own system. Athletic brands began using the number system (2E, 4E) for precision. Retail brands opted for plain-language labels (Narrow, Wide, Extra Wide) for simplicity. None of these systems were ever unified.
The practical result is that you need to know which system a brand uses and translate accordingly. The master reference table at the top of this page gives you every known equivalent so you can translate any code you encounter.
How to Read a Shoe Box Width Label
Knowing where to look is half the battle. Width information appears in several places on a shoe and its packaging — and sometimes in none of them if the shoe is standard width.
On the shoe box:
Look at the end label on the short side of the box. You’ll see the size and often the width in a format like: 10 D(M) or 9.5 2E or 8 W. The number is the length size. The letter or code after it is the width. The letter in parentheses — like the M in D(M) — is the word equivalent (M = medium in this case).
On the shoe’s tongue label:
The fabric label sewn inside the tongue of the shoe typically shows size and width. This is often where non-standard widths are marked. A standard-width shoe may show only the size number here with no width designation.
In online product listings:
Width is usually a dropdown or variant selector in the product listing. If no width selector appears, the shoe only comes in standard medium width. Look for labels like “Width: D (Medium)” or a dropdown showing “Narrow / Medium / Wide / Extra Wide.”
When there is no marking at all:
The shoe is standard medium width — D for men, B for women. This is the most common scenario for everyday fashion footwear, casual shoes, and many dress shoes. Only athletic, orthopedic, and comfort-focused brands consistently mark widths across their range.
Common Width Code Confusion — Resolved
Is 2E the same as EE?
Yes — exactly the same width, written two different ways. New Balance tends to use 2E. Brooks uses 2E. Saucony uses 2E. Older American brands and some dress shoe manufacturers use EE. If you see either one, they refer to the same width.
Is D wide or medium?
Both — it depends on gender. D is medium for men and wide for women. This is the most commonly confused width code. A woman who sees “D width” should know she’s looking at a wide shoe. A man who sees “D width” is looking at the standard medium.
What does the M in D(M) mean?
The M stands for “medium” and confirms that D is being used in the men’s medium sense. You’ll see this format on New Balance boxes most commonly: 10 D(M) US means US men’s size 10, D width (medium). The parenthetical is there specifically to clarify the gender context of the width designation.
What does W mean on a shoe?
It depends on context. On a men’s shoe, W typically means wide (equivalent to E). On a women’s shoe, W also means wide (equivalent to D). Some brands use WW for extra wide and WWW or 2W for wider still. The W system is most commonly used by casual and comfort brands like Skechers and Clarks as an alternative to the letter-number system.
What is the difference between Wide and Extra Wide?
Wide is typically E width for men (one step above medium D) or D width for women (one step above medium B). Extra Wide is typically 2E for men or E for women. The plain-language labels “Wide” and “Extra Wide” on shoe product pages generally correspond to these designations, though some brands use them inconsistently — always check the actual measurement in the width chart for your size if precision matters.
Width Codes by Shoe Category
Different types of shoes use different width code conventions. Knowing which system a shoe category typically uses helps you decode labels faster.
| Shoe Category | Width System Used | Typical Width Range |
|---|---|---|
| Running / Athletic | Letter-number (D, 2E, 4E) | B through 4E (men), AA through 2E (women) |
| Dress Shoes | Letter (A, B, D, E, EE) | A through EE — limited wide options |
| Casual / Lifestyle | Words (Narrow, Wide) or letter | Usually medium only, some wide |
| Work Boots | Letter (D, EE) or words | D through EE most common |
| Orthopedic / Therapeutic | Letter-number (D through 6E) | D through 6E — widest range available |
| Children’s | Words (Medium, Wide, XW) | Medium only in most brands |
Now Find Your Width
Now that you understand the codes, use our complete width charts to find your exact width designation based on your foot measurement.
How to Measure → Men’s Chart →Frequently Asked Questions
4E is a men’s shoe width that is three steps wider than standard medium (D). Each E adds approximately 1/8 inch of width, so 4E is 3/8 inch wider than standard D width at the ball of the foot. It is also written as EEEE or XXXW. 4E is primarily used in men’s athletic and orthopedic footwear — brands like New Balance, OrthoFeet, and Propet carry 4E in various styles. It is particularly common in footwear for men with diabetes, edema, or naturally very wide feet.
For women, AAA (3A) is the narrowest commercially available width, though it is extremely rare and typically only available through specialty narrow-width retailers. AA (2A) is more commonly available from brands like Naturalizer and New Balance. For men, B is the narrowest width readily available from mainstream brands, with A available from specialty retailers. If you need a very narrow width and can’t find what you need in stores, online specialty retailers have the widest narrow-width selection.
Because they are standard medium width — D for men, B for women. Industry convention is to only mark non-standard widths. An unmarked shoe is not missing information — the absence of a width marking is itself information telling you the shoe is medium width. This is similar to how food packaging doesn’t say “normal flavor” — the absence of a special label means it’s the standard version.
Roughly — women’s feet are approximately 1.5 width sizes narrower than men’s feet for the same letter designation. A women’s D width is approximately equivalent to a men’s B width in terms of where it falls on the spectrum. However, men’s and women’s shoes are built on different lasts (foot forms) with different proportions beyond just width, so direct conversion is imperfect. The most reliable approach is to measure your foot width in inches and look up your actual measurement on the gender-specific chart for whatever shoe you’re buying.
Medium width is the standard width that shoe manufacturers produce as their default. For men it is D width. For women it is B width. Medium width fits the statistical average foot — approximately 60–65% of people fall into the medium width range for their size. The remaining 35–40% need a narrower or wider shoe. Medium width shoes are typically sold without any width designation because they are the default.
D width (medium) is by far the most common, followed by E (wide) and 2E (extra wide). Studies of foot measurement populations consistently show that about 60% of men wear D width comfortably, with the majority of the remaining 40% needing E or 2E. Very few men need widths narrower than D, and widths above 2E are a small but significant minority — primarily men with diabetes, edema, or naturally very broad feet.