NikeMen's
JA 3
Fit verdict, size conversion guide, and millimeter measurements.
Fit Analysis & Sizing Advice
Order Your Standard SizeThis shoe fits consistent with standard sizing charts. You can comfortably order your usual sneaker size.
Runs Small (–8mm)True to SizeRuns Large (+8mm)
Snug / 1 Size UpStandard fitRoomy / 1 Size Down
Width: Narrow Fit. Tends to feel snug across the midfoot and forefoot. Wide-foot wearers should consider sizing up or looking for wide widths.
Community Fit Consensus
Aggregated feedback from verified shoe owners
3.9
(13 ratings)80% of wearers report this shoe fits True to Size.
Length Distribution
Runs Small10%
True to Size80%
Runs Large10%
Width Distribution
Runs Narrow20%
Standard Width74%
Runs Wide6%
Complete Size Chart
Showing 14 sizes| EU | US (M) | UK | Foot Length | Cavity Length |
|---|---|---|---|---|
| 40 | 7 | 6.5 | 26.7 cm | 267 mm |
| 40.5 | 7.5 | 7 | 27.0 cm | 270 mm |
| 41 | 8 | 7.5 | 27.3 cm | 273 mm |
| 41.5 | 8.5 | 8 | 27.7 cm | 277 mm |
| 42 | 9 | 8.5 | 28.0 cm | 280 mm |
| 42.5 | 9.5 | 9 | 28.3 cm | 283 mm |
| 43 | 10 | 9.5 | 28.7 cm | 287 mm |
| 43.5 | 10.5 | 10 | 29.0 cm | 290 mm |
| 44 | 11 | 10.5 | 29.3 cm | 293 mm |
| 44.5 | 11.5 | 11 | 29.7 cm | 297 mm |
| 45 | 12 | 11.5 | 30.0 cm | 300 mm |
| 45.5 | 12.5 | 12 | 30.3 cm | 303 mm |
| 46 | 13 | 12.5 | 30.7 cm | 307 mm |
| 47 | 14 | 13.5 | 31.3 cm | 313 mm |
Frequently Asked Questions
Does the Nike JA 3 run big or small?
Yes, this shoe runs true to size. You should order your typical shoe size. This shoe fits consistent with standard sizing charts. You can comfortably order your usual sneaker size.
How does Shoe Fit determine shoe sizing?
Shoe Fit calculates the real-world interior shoe cavity in millimeters combined with real owner feedback, rather than relying on arbitrary brand charts.
Find Your Exact Size
Already own a shoe that fits well? Shoe Fit cross-references its internal cavity against the Nike JA 3 to give you your personalized size.
Instant recommendation
Accounts for width & stretch
No sign-up required
Model Details
BrandNike
ModelJA 3
Gender SpecMen's
Sizes Offered14 sizes
Community Rating3.9 ★ (13 votes)
Fit Data SourceCommunity Validated
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