Running Shoe Size Chart & Width Guide (+ Brand Conversion Tool)

Men’s Widths: B (Narrow), D (Medium), 2E (Wide), 4E (Extra Wide — expanded sole platform)
Women’s Widths: 2A (Narrow), B (Medium), D (Wide), 2E (Extra Wide — expanded sole platform)

Brooks serves as the North American length and width benchmark across Ghost, Ghost Max, Glycerin, Adrenaline GTS, and Beast/Ariel GTS. Per Brooks engineering specs, Narrow (2A/B), Medium (B/D), and Wide (D/2E) grade upper volume over the standard base, whereas Extra Wide (4E Men’s / 2E Women’s) physically widens the sole platform. Hyperion speed/race models and StealthFit™ knit uppers come in Medium width only with a trimmer forefoot wrap.

Men’s Widths: B (Narrow), D (Standard), 2E (Wide — incl. Rebel & SC Elite), 4E (Extra Wide; 880 reaches 6E)
Women’s Widths: 2A (Narrow), B (Standard), D (Wide — incl. Rebel & SC Elite), 2E (Extra Wide)

New Balance grades the physical midsole and strobel base from 2A Narrow through 4E Extra Wide on core trainers (1080, 880, 860, Fresh Foam X More, with Men’s 880 reaching 6E XX-Wide). The 1080 pairs a stretchy, high-instep upper with generous toe room, 880 and 860 hold the midfoot more structured, and New Balance uniquely stocks 2E/D Wide on uptempo FuelCell Rebel and carbon SuperComp Elite marathon shoes. Women’s tags print W 8.5 = UK 6.5 = EU 40 = 25.0 cm.

Men’s Widths: B (Narrow — select), D (Standard), 2E (Wide), 4E (Extra Wide — Nimbus, Kayano, GT-2000, Cumulus)
Women’s Widths: 2A (Narrow — select), B (Standard), D (Wide), 2E (Extra Wide — select; no Women’s 4E)

ASICS fits true to standard US running length alongside Brooks and New Balance (note ASICS omits D/B letters on standard box labels and only prints 2A, 2E, or 4E). Because a half US size equals ~0.42 cm, ASICS inserts quarter-cm label steps at Men’s US 7.0 (25.25 cm) and US 10.5 (28.25 cm). GEL-Nimbus, GEL-Kayano, GT-2000, and Gel-Cumulus stock 2E Wide and Men’s 4E, Novablast offers a roomy forefoot plus 2E Wide, Superblast uses Unisex (Men’s D) sizing, and Metaspeed Sky/Edge racers wrap low and snug (+0.5 US if between sizes).

Men’s Widths: D (Standard), 2E (Wide — Pegasus, Vomero, Structure, Winflo), 4E (Extra Wide — Pegasus select)
Women’s Widths: B (Standard), D (Wide — Pegasus, Vomero, Structure, Winflo)

Nike’s daily road trainers (Pegasus, Vomero, Structure, Winflo) match standard US length and stock Wide (2E Men’s / D Women’s), while select black/white Men’s Pegasus colorways carry an Extra Wide (4E) tag—still trimmer through the arch than New Balance or Brooks 4E. In carbon racers, Vaporfly runs ultra-narrow true-to-length while Alphafly fits snugger around its forefoot Air Zoom pods (+0.5 US if between sizes), with some of the lowest vertical toe ceilings in running. No Narrow widths.

Men’s Widths: D (Medium), 2E (Wide — Ride, Guide, Triumph, Hurricane, Peregrine), 4E (Extra Wide — Echelon)
Women’s Widths: B (Medium), D (Wide — Ride, Guide, Triumph, Hurricane, Peregrine), 2E (Extra Wide — Echelon)

Saucony fits true to standard North American Men’s and Women’s US sizes across Ride, Guide, Triumph, Hurricane, and Kinvara, with Wide (2E/D) stocked on core daily trainers plus Peregrine trail, and straight-last Extra Wide (4E/2E) on the orthotic-ready Echelon. By contrast, Endorphin Speed and Endorphin Pro come in Standard width only with a closer race forefoot (+0.5 US if wide-footed). On Women’s tags, Saucony prints W 8.5 = EU 40 = 25.0 cm. No Narrow widths.

Men’s Widths: Regular (D eq.), Wide (Cloudrunner, Cloudmonster 2/3, Cloud 6 & select Cloudsurfer)
Women’s Widths: Regular (B eq.), Wide (Cloudrunner, Cloudmonster 2/3, Cloud 6 & select Cloudsurfer)

On does not print Brannock letter codes (2E/4E) on boxes—look for explicit “Wide” editions on Cloudrunner, Cloudmonster 2/3, Cloud 6, and select Cloudsurfer models. Cloudeclipse is Regular-only yet features an accommodating forefoot, whereas Cloudgo and Cloudboom racers (Strike, Echo) wrap narrower in Regular width only. Non-stretch On Waterproof (WP) membranes reduce instep give and typically warrant +0.5 US size. No Narrow or Extra Wide options.

Men’s Widths: D (Standard), 2E (Wide — Supernova Rise/Solution daily models only; Adizero is Standard-only)
Women’s Widths: B (Standard), D (Wide — Supernova Rise select; Adizero is Standard-only)

Never cross-shop Adidas using a Brooks or Nike UK number: Adidas uses UK = US Men − 0.5 (UK 9.5 = Men’s US 10 = JP 280 = EU 44) and a 1.0-size Men’s/Women’s US offset (Women’s US 8.5 = Men’s US 7.5 = UK 7 = EU 40 2/3). Daily Supernova Rise/Solution trainers fit forgivingly with select Wide SKUs, whereas the Standard-only Adizero line varies: Boston runs slightly long with a narrow arch, Evo SL fits medium-snug, and Adios Pro / Takumi Sen run race-tight with shallow toe ceilings (most go +0.5 US).

Men’s Widths: D across Original, Standard & Slim FootShape lasts; 2E Wide in Torin & Lone Peak
Women’s Widths: B across Original, Standard & Slim FootShape lasts; D Wide in Torin & Lone Peak

Altra builds across three FootShape™ lasts: Original (widest toe splay on Lone Peak, Olympus, and Escalante—note Olympus sits slightly lower over the instep), Standard (most road/trail models including Torin, Experience Flow/Form, Paradigm, and Timp), and Slim (Rivera and Vanish racers). Dedicated Wide (2E Men’s / D Women’s) SKUs are stocked on Torin and Lone Peak; Altra does not make 4E Extra Wide or 2A Narrow. Women’s tags print W 8.5 = EU 40 = 25.0 cm.

Men’s Widths: Standard (E forefoot / D heel-midfoot), 2E Wide (2E forefoot / E heel — Phantom, Atmos, Ultraventure)
Women’s Widths: Standard (D forefoot / B heel-midfoot), D Wide (E forefoot / D heel — Phantom, Atmos, Ultraventure)

Topo Athletic engineers a dual-zone Brannock fit: Standard models combine an E-width anatomical toe box with a D-width heel/midfoot for Men (D forefoot / B heel for Women)—preventing heel slip on “triangle-shaped” feet. Dedicated Wide editions (Phantom, Atmos, Ultraventure) expand to a 2E forefoot / E heel for Men and an E forefoot / D heel for Women, while uptempo Specter and Cyclone models wrap closer through the waist (+0.5 US if between sizes on Specter). No Narrow or 4E.

Men’s Widths: D (Standard), 2E (Wide — Wave Rider, Wave Inspire & select Wave Sky)
Women’s Widths: B (Standard), D (Wide — Wave Rider, Wave Inspire & select Wave Sky)

Mizuno builds to Japanese Mondopoint millimeters (280 mm = 28.0 cm = Men’s US 10) and stamps EU 43 where Brooks and Nike stamp EU 44. Wave Rider and Wave Inspire run true to size with reliable Wide (2E/D) SKUs, whereas Standard-only Neo Zen runs slightly generous in length, knit-bootie Neo Vista wraps snugger around the ankle, and Wave Rebellion Pro tapers for racing. Note: Japanese domestic (JIS) “2E”/“4E” import labels run one width narrower than US codes (JIS 4E ≈ US 2E).

Men’s Widths: D (Standard — narrow Euro last; rare regional 2E on Velocity NITRO)
Women’s Widths: B (Standard — narrow Euro last)

Puma’s US NITRO lineup is sold almost exclusively in Standard Medium (D/B) width and stamps Men’s US 10 as EU 43 (28.0 cm) and Women’s US 8.5 as EU 39 (25.0 cm). Velocity NITRO and Deviate NITRO / Elite wrap closely through a narrow European midfoot and tapered toe box (+0.5 US for wider feet), whereas ForeverRun NITRO widens the forefoot base (with lower instep height) and MagMax NITRO gives toes more room ahead of a snug waist. No Narrow or 4E options.

Men’s Widths: D (Classic Fit Medium — Aero running series is Medium-only; 2E/4E on Max Cushioning/walking)
Women’s Widths: B (Classic Fit Medium — Aero running series is Medium-only; D Wide on Max Cushioning/walking)

Skechers’ Aero performance road lineup (Aero Burst, Aero Spark, Aero Razor) maps 28.0 cm = Men’s US 10 (EU 43) and 27.0 cm = Women’s US 10 (UK = US Women − 3). Unlike older roomy GO RUN trainers or Relaxed Fit walking shoes, the Aero series is built exclusively in Classic Fit Medium (D/B) with a closer forefoot taper and lower vertical toe ceiling—while Skechers Wide (2E/D) and Extra Wide (4E) options live on its Max Cushioning and walking lines.