Shoe width explained: B, D, 2E and 4E
Length gets all the attention, but width is half of a good fit. Those little letters after your size — B, D, 2E, 4E — describe how wide the shoe is. Here’s what they mean and how to tell which one you need.
Width letters decoded
US width is graded in letters, and the same letter means different things on the men’s and women’s scales — a frequent source of confusion.
| Code | Men’s | Women’s | Who it’s for |
|---|---|---|---|
| B | Narrow | Standard / Medium | Slim feet that slide around in standard-width shoes |
| D | Standard / Medium | Wide | The default width most shoes are built in |
| 2E | Wide | Extra wide | A wider forefoot; sides feel pinched at standard width |
| 4E | Extra wide | — | Very wide or high-volume feet, or room for orthotics |
Key quirk: D is standard for men but wide for women, and B is standard for women but narrow for men. Always check whether a width is quoted on the men’s or women’s scale.
How to tell if you need a wide fitting
- Pressure on the sides. The ball of your foot feels squeezed, or the upper leaves marks on the sides of your feet.
- You size up for width. If the only way to get comfortable width is a longer size, you likely need a wider fitting, not a longer shoe.
- Toe spread. Wide or splayed toes that press into the toe box are a classic sign.
- High volume or orthotics. A high instep, or wearing insoles, both eat into width and may call for 2E or 4E.
To gauge width at home, stand and measure across the widest part of your foot (the ball), and compare both feet — it’s normal for them to differ. Width charts vary by brand, so use a wide fitting as a starting point and confirm with the specific shoe.
Our converter and brand charts focus on length (the part that converts cleanly across brands). Width options depend heavily on the brand and model, so check the product page for available fittings — brands like New Balance and Asics offer the most. To nail length first, measure your foot and convert your size.
Frequently asked questions
What does D width mean in shoes?
D is the standard (medium) width for men — the default most shoes ship in. For women, D is actually a wide width; women’s standard is B. So the same letter means different things depending on the gender scale.
What is the difference between 2E and 4E?
2E is wide and 4E is extra wide. 4E gives noticeably more room across the forefoot and more volume overall, which suits very wide feet, high insteps, or wearing orthotic insoles.
How do I know if I need a wide shoe?
If your standard-width shoes feel tight across the ball of the foot, leave marks on the sides, or you size up just to get width (which makes them too long), you probably need a wide fitting. Measuring the ball of your foot and comparing both feet helps confirm it.
Which brands offer wide sizes?
New Balance and Asics are among the best for multiple widths, including 2E and 4E. Many lifestyle and sneaker brands only offer a single standard width, so width options vary a lot by brand and model.