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 | 244 mm | US 4.5 | 88% | -1.0 mm |
| US 4 | 247 mm | US 5 | 88% | -1.0 mm |
| US 4.5 | 251 mm | US 5.5 | 76% | -2.0 mm |
| US 5 | 254 mm | US 6 | 88% | -1.0 mm |
| US 5.5 | 257 mm | US 6.5 | 88% | -1.0 mm |
| US 6 | 261 mm | US 7 | 76% | +2.0 mm |
| US 6.5 | 264 mm | US 7 | 88% | -1.0 mm |
| US 7 | 271 mm | US 8 | 76% | -2.0 mm |
| US 7.5 | 274 mm | US 8.5 | 88% | -1.0 mm |
| US 8 | 277 mm | US 9 | 88% | -1.0 mm |
| US 8.5 | 281 mm | US 9.5 | 76% | -2.0 mm |
| US 9 | 284 mm | US 10 | 88% | -1.0 mm |
| US 9.5 | 287 mm | US 10.5 | 88% | -1.0 mm |
| US 10 | 291 mm | US 11 | 76% | -2.0 mm |
| US 10.5 | 294 mm | US 11.5 | 88% | -1.0 mm |
| US 11 | 297 mm | US 12 | 88% | -1.0 mm |
| US 11.5 | 301 mm | US 12.5 | 76% | -2.0 mm |
| US 12 | 304 mm | US 13 | 88% | -1.0 mm |
| US 12.5 | 307 mm | US 14 | 76% | +2.0 mm |
| US 13 | 311 mm | US 14 | 76% | -2.0 mm |
| US 14 | 317 mm | US 14 | 5% | -8.0 mm |
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Frequently Asked Questions
How does the Kerri size compare to the Tarkiln?
The Tarkiln is about 8mm shorter than the Kerri. We suggest ordering 1 full size up in Tarkiln. The Kerri has an internal fit offset of 4mm compared to -4mm for the Tarkiln.
Do these shoes fit wide feet comfortably?
The Kerri has a standard medium width profile, while the Tarkiln is standard medium.