True-to-Size Millimeter Sizing Comparison
Born Kerri vs Born Tarkiln
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 Kerri to see your calculated size in the Tarkiln.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Kerri (US) | Internal Cavity | Tarkiln Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 3.5 | 241 mm | US 4 | 82% | +1.5 mm |
| US 4 | 244 mm | US 4.5 | 70% | +2.5 mm |
| US 4.5 | 248 mm | US 5 | 82% | +1.5 mm |
| US 5 | 251 mm | US 5.5 | 82% | +1.5 mm |
| US 5.5 | 254 mm | US 6 | 70% | +2.5 mm |
| US 6 | 258 mm | US 6.5 | 82% | +1.5 mm |
| US 6.5 | 261 mm | US 6.5 | 83% | -1.5 mm |
| US 7 | 268 mm | US 7.5 | 82% | +1.5 mm |
| US 7.5 | 271 mm | US 8 | 82% | +1.5 mm |
| US 8 | 274 mm | US 8.5 | 70% | +2.5 mm |
| US 8.5 | 278 mm | US 9 | 82% | +1.5 mm |
| US 9 | 281 mm | US 9.5 | 82% | +1.5 mm |
| US 9.5 | 284 mm | US 10 | 70% | +2.5 mm |
| US 10 | 288 mm | US 10.5 | 82% | +1.5 mm |
| US 10.5 | 291 mm | US 11 | 82% | +1.5 mm |
| US 11 | 294 mm | US 11.5 | 70% | +2.5 mm |
| US 11.5 | 298 mm | US 12 | 82% | +1.5 mm |
| US 12 | 301 mm | US 12.5 | 82% | +1.5 mm |
| US 12.5 | 304 mm | US 13 | 70% | +2.5 mm |
| US 13 | 308 mm | US 14 | 47% | +4.5 mm |
| US 14 | 314 mm | US 14 | 83% | -1.5 mm |
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Frequently Asked Questions
How does the Kerri size compare to the Tarkiln?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Kerri has an internal fit offset of 0.88mm compared to -0.6mm for the Tarkiln.
Do these shoes fit wide feet comfortably?
The Kerri has a snug/narrow width profile, while the Tarkiln is snug/narrow.