True-to-Size Millimeter Sizing Comparison
ASICS Novablast 5 vs Nike Vomero 18
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 Novablast 5 to see your calculated size in the Vomero 18.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Novablast 5 (US) | Internal Cavity | Vomero 18 Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 7 | 263 mm | US 7 | 5% | +8.0 mm |
| US 7.5 | 266 mm | US 7 | 41% | +5.0 mm |
| US 8 | 269 mm | US 7 | 76% | +2.0 mm |
| US 8.5 | 273 mm | US 7.5 | 88% | +1.0 mm |
| US 9 | 276 mm | US 8 | 88% | +1.0 mm |
| US 9.5 | 279 mm | US 8 | 76% | -2.0 mm |
| US 10 | 283 mm | US 9 | 88% | +1.0 mm |
| US 10.5 | 286 mm | US 9.5 | 88% | +1.0 mm |
| US 11 | 289 mm | US 9.5 | 76% | -2.0 mm |
| US 11.5 | 293 mm | US 10.5 | 88% | +1.0 mm |
| US 12 | 296 mm | US 11 | 88% | +1.0 mm |
| US 12.5 | 299 mm | US 11 | 76% | -2.0 mm |
| US 13 | 303 mm | US 12 | 88% | +1.0 mm |
| US 14 | 309 mm | US 12.5 | 76% | -2.0 mm |
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Frequently Asked Questions
How does the Novablast 5 size compare to the Vomero 18?
The Vomero 18 provides about 8mm more internal length than the Novablast 5. We suggest ordering 1 full size down in Vomero 18. The Novablast 5 has an internal fit offset of -4mm compared to 4mm for the Vomero 18.
Do these shoes fit wide feet comfortably?
The Novablast 5 has a standard medium width profile, while the Vomero 18 is standard medium.