True-to-Size Millimeter Sizing Comparison
Jessica Simpson Calie vs Jessica Simpson Nettles Pump
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 Calie to see your calculated size in the Nettles Pump.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Calie (US) | Internal Cavity | Nettles Pump Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 3.5 | 239 mm | US 5.5 | 97% | +0.2 mm |
| US 4 | 242 mm | US 6 | 97% | +0.2 mm |
| US 4.5 | 246 mm | US 6.5 | 97% | +0.2 mm |
| US 5 | 249 mm | US 7 | 97% | +0.2 mm |
| US 5.5 | 252 mm | US 7.5 | 97% | +0.2 mm |
| US 6 | 256 mm | US 8 | 97% | +0.2 mm |
| US 6.5 | 259 mm | US 8.5 | 97% | +0.2 mm |
| US 7 | 266 mm | US 9 | 97% | +0.2 mm |
| US 7.5 | 269 mm | US 9.5 | 97% | +0.2 mm |
| US 8 | 272 mm | US 10 | 97% | +0.2 mm |
| US 8.5 | 276 mm | US 10.5 | 97% | +0.2 mm |
| US 9 | 279 mm | US 11 | 97% | +0.2 mm |
| US 9.5 | 282 mm | US 11 | 67% | -2.8 mm |
| US 10 | 286 mm | US 11 | 20% | -6.8 mm |
| US 10.5 | 289 mm | US 11 | 0% | -9.8 mm |
| US 11 | 292 mm | US 11 | 0% | -12.8 mm |
| US 11.5 | 296 mm | US 11 | 0% | -16.8 mm |
| US 12 | 299 mm | US 11 | 0% | -19.8 mm |
| US 12.5 | 302 mm | US 11 | 0% | -22.8 mm |
| US 13 | 306 mm | US 11 | 0% | -26.8 mm |
| US 14 | 312 mm | US 11 | 0% | -32.8 mm |
Frequently Asked Questions
How does the Calie size compare to the Nettles Pump?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Calie has an internal fit offset of -0.8mm compared to -0.56mm for the Nettles Pump.
Do these shoes fit wide feet comfortably?
The Calie has a snug/narrow width profile, while the Nettles Pump is snug/narrow.