True-to-Size Millimeter Sizing Comparison
Vans Authentic vs Vans Old Skool
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 Authentic to see your calculated size in the Old Skool.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Authentic (US) | Internal Cavity | Old Skool Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 7 | 260 mm | US 7 | 99% | -0.1 mm |
| US 7.5 | 267 mm | US 7.5 | 99% | -0.1 mm |
| US 8 | 270 mm | US 8 | 99% | -0.1 mm |
| US 8.5 | 273 mm | US 8.5 | 99% | -0.1 mm |
| US 9 | 280 mm | US 9 | 99% | -0.1 mm |
| US 9.5 | 283 mm | US 9.5 | 99% | -0.1 mm |
| US 10 | 287 mm | US 10 | 99% | -0.1 mm |
| US 10.5 | 293 mm | US 10.5 | 99% | -0.1 mm |
| US 11 | 297 mm | US 11 | 99% | -0.1 mm |
| US 11.5 | 300 mm | US 11.5 | 99% | -0.1 mm |
| US 12 | 307 mm | US 12 | 99% | -0.1 mm |
| US 13 | 313 mm | US 13 | 99% | -0.1 mm |
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Frequently Asked Questions
How does the Authentic size compare to the Old Skool?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Authentic has an internal fit offset of 0.12mm compared to 0.04mm for the Old Skool.
Do these shoes fit wide feet comfortably?
The Authentic has a standard medium width profile, while the Old Skool is snug/narrow.