True-to-Size Millimeter Sizing Comparison
Lucky Brand Eikia Ballet Flat vs Lucky Brand Emmie
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 Eikia Ballet Flat to see your calculated size in the Emmie.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Eikia Ballet Flat (US) | Internal Cavity | Emmie Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4.5 | 232 mm | US 5 | 57% | +3.6 mm |
| US 5 | 236 mm | US 5.5 | 69% | +2.6 mm |
| US 5.5 | 239 mm | US 6 | 69% | +2.6 mm |
| US 6 | 242 mm | US 6 | 95% | -0.4 mm |
| US 6.5 | 246 mm | US 7 | 69% | +2.6 mm |
| US 7 | 249 mm | US 7.5 | 69% | +2.6 mm |
| US 7.5 | 252 mm | US 7.5 | 95% | -0.4 mm |
| US 8 | 256 mm | US 8.5 | 69% | +2.6 mm |
| US 8.5 | 259 mm | US 8.5 | 95% | -0.4 mm |
| US 9 | 266 mm | US 9.5 | 69% | +2.6 mm |
| US 9.5 | 269 mm | US 10 | 69% | +2.6 mm |
| US 10 | 272 mm | US 10 | 95% | -0.4 mm |
| US 10.5 | 276 mm | US 11 | 69% | +2.6 mm |
| US 11 | 279 mm | US 11 | 95% | -0.4 mm |
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Frequently Asked Questions
How does the Eikia Ballet Flat size compare to the Emmie?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Eikia Ballet Flat has an internal fit offset of -0.76mm compared to -1.16mm for the Emmie.
Do these shoes fit wide feet comfortably?
The Eikia Ballet Flat has a snug/narrow width profile, while the Emmie is snug/narrow.