True to size, and that is the least interesting thing about it
New Balance runs true to size in length, and it is more consistent about that than most brands. If the question is only whether to order your usual number, the answer is yes and you can stop reading. But that is rarely the question people actually have, because the complaint about New Balance is almost never that a shoe was the wrong length. It is that it pinched.
Width is the axis that matters here, and New Balance is the one major brand that treats it as a real product rather than an afterthought. It publishes 2A through 6E across nearly every length of the popular models. That single fact changes the answer to almost every fit problem on this page, and it is why our advice here differs from the advice on our other brand pages.
The formula
width = 2A / B / D / 2E / 4E, ordered separately, number unchanged
UK = US men's − 0.5 | EU = US men's + 33
Men's standard width is D, women's standard is B. Conversions match our shoe size converter, so the two pages cannot disagree.
Worked example
Why half the internet says these run small
Search whether the 574 runs small and you will get both answers with equal confidence. Both camps are describing the same shoe honestly, and the disagreement is not about measurement.
The 574 is cut on the narrow side of standard. A narrow shoe pinches across the widest part of your foot, and a pinching shoe feels short, because your toes are the part you notice. So people reach for the only lever most brands offer and go up half a size. In a standard D that buys them length they did not need while barely touching the width they did, so the shoe still feels wrong, and the natural conclusion is that the model runs small. It does not. It runs narrow, and the fix was on the same product page the whole time.
What the width letters actually mean
From narrowest to widest: 2A, B, D, 2E, 4E, 6E. The trap is that men's standard is D while women's standard is B, so the same letter means different things depending on which scale a listing is using. A women's D is a wide shoe. A men's D is an ordinary one. Check which scale you are looking at before you order, because that mismatch sends more people to the returns desk than the length ever does.
Worth knowing even if your feet are average: this is a brand where a fit problem has a cheap answer later. If a pair pinches after a few weeks, you can reorder the same number in a wider cut rather than starting over on size.
How this compares to our other brand pages
Five brand pages now, and each answers "is it true to size" differently, because the shoes are built differently. Chuck Taylors run a genuine half size large, so there the size down is a correction rather than a preference. Vans are true to size new and looser later, because canvas stretches. Air Jordans are true to size in length and the real variable is width, with the patent-uppered Jordan 11 never giving at all. Yeezy has no single answer, because the 350 and the 700 are barely the same kind of shoe. And HOKA is true to size but narrow, which sounds like this page until you look at what you can do about it.
That last comparison is the useful one. Jordan and HOKA both have width problems and neither brand sells you out of them, so both pages end up recommending half a size up and a slightly long shoe. New Balance is the same problem with a real solution, which is the strongest argument for buying it. If none of this settles your size, start from your foot length instead of from a number you already own.