True-to-Size Millimeter Sizing Comparison
Adidas Stan Smith vs Vans Classic Slip-On
Detailed size conversion chart, cavity measurements in millimeters, and crowd-sourced fit advice for choosing your perfect size.
Interactive Size Converter
Select what size you wear in the Stan Smith to see your calculated size in the Classic Slip-On.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Stan Smith (US) | Internal Cavity | Classic Slip-On Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4 | 237 mm | US 7 | 0% | +22.8 mm |
| US 4.5 | 241 mm | US 7 | 0% | +18.8 mm |
| US 5 | 245 mm | US 7 | 0% | +14.8 mm |
| US 5.5 | 249 mm | US 7 | 0% | +10.8 mm |
| US 6 | 254 mm | US 7 | 31% | +5.8 mm |
| US 6.5 | 258 mm | US 7 | 79% | +1.8 mm |
| US 7 | 262 mm | US 7.5 | 43% | +4.8 mm |
| US 7.5 | 266 mm | US 7.5 | 91% | +0.8 mm |
| US 8 | 271 mm | US 8.5 | 79% | +1.8 mm |
| US 8.5 | 275 mm | US 9 | 43% | +4.8 mm |
| US 9 | 279 mm | US 9 | 91% | +0.8 mm |
| US 9.5 | 283 mm | US 9.5 | 98% | -0.2 mm |
| US 10 | 287 mm | US 10 | 98% | -0.2 mm |
| US 10.5 | 292 mm | US 10.5 | 91% | +0.8 mm |
| US 11 | 296 mm | US 11 | 91% | +0.8 mm |
| US 11.5 | 300 mm | US 11.5 | 98% | -0.2 mm |
| US 12 | 304 mm | US 12 | 67% | +2.8 mm |
| US 12.5 | 309 mm | US 13 | 55% | +3.8 mm |
| US 13 | 313 mm | US 13 | 98% | -0.2 mm |
| US 13.5 | 317 mm | US 13 | 50% | -4.2 mm |
| US 14 | 321 mm | US 13 | 3% | -8.2 mm |
| US 14.5 | 326 mm | US 13 | 0% | -13.2 mm |
| US 15 | 330 mm | US 13 | 0% | -17.2 mm |
| US 16 | 334 mm | US 13 | 0% | -21.2 mm |
| US 17 | 342 mm | US 13 | 0% | -29.2 mm |
| US 18 | 351 mm | US 13 | 0% | -38.2 mm |
| US 19 | 359 mm | US 13 | 0% | -46.2 mm |
| US 20 | 368 mm | US 13 | 0% | -55.2 mm |
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Frequently Asked Questions
How does the Stan Smith size compare to the Classic Slip-On?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Stan Smith has an internal fit offset of 0.12mm compared to -0.08mm for the Classic Slip-On.
Do these shoes fit wide feet comfortably?
The Stan Smith has a snug/narrow width profile, while the Classic Slip-On is snug/narrow.