True-to-Size Millimeter Sizing Comparison
Nike Air Max Plus vs Nike Air Monarch IV
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 Air Max Plus to see your calculated size in the Air Monarch IV.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Air Max Plus (US) | Internal Cavity | Air Monarch IV Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 3.5 | 232 mm | US 3.5 | 96% | -0.4 mm |
| US 4 | 236 mm | US 4 | 96% | -0.4 mm |
| US 4.5 | 240 mm | US 4.5 | 96% | -0.4 mm |
| US 5 | 245 mm | US 5 | 96% | -0.4 mm |
| US 5.5 | 249 mm | US 5.5 | 96% | -0.4 mm |
| US 6 | 253 mm | US 6 | 96% | -0.4 mm |
| US 6.5 | 257 mm | US 6.5 | 96% | -0.4 mm |
| US 7 | 261 mm | US 7 | 96% | -0.4 mm |
| US 7.5 | 266 mm | US 7.5 | 96% | -0.4 mm |
| US 8 | 270 mm | US 8 | 96% | -0.4 mm |
| US 8.5 | 274 mm | US 8.5 | 96% | -0.4 mm |
| US 9 | 278 mm | US 9 | 96% | -0.4 mm |
| US 9.5 | 283 mm | US 9.5 | 96% | -0.4 mm |
| US 10 | 287 mm | US 10 | 96% | -0.4 mm |
| US 10.5 | 291 mm | US 10.5 | 96% | -0.4 mm |
| US 11 | 295 mm | US 11 | 96% | -0.4 mm |
| US 11.5 | 299 mm | US 11.5 | 96% | -0.4 mm |
| US 12 | 304 mm | US 12 | 96% | -0.4 mm |
| US 12.5 | 308 mm | US 12.5 | 96% | -0.4 mm |
| US 13 | 312 mm | US 13 | 96% | -0.4 mm |
| US 13.5 | 316 mm | US 13.5 | 96% | -0.4 mm |
| US 14 | 321 mm | US 14 | 96% | -0.4 mm |
| US 14.5 | 325 mm | US 14.5 | 96% | -0.4 mm |
| US 15 | 329 mm | US 15 | 96% | -0.4 mm |
| US 15.5 | 333 mm | US 15.5 | 96% | -0.4 mm |
| US 16 | 338 mm | US 16 | 96% | -0.4 mm |
| US 16.5 | 342 mm | US 16.5 | 96% | -0.4 mm |
| US 17 | 346 mm | US 17 | 96% | -0.4 mm |
| US 17.5 | 350 mm | US 17.5 | 96% | -0.4 mm |
| US 18 | 355 mm | US 18 | 96% | -0.4 mm |
| US 18.5 | 359 mm | US 18.5 | 96% | -0.4 mm |
| US 19 | 363 mm | US 19 | 96% | -0.4 mm |
| US 19.5 | 367 mm | US 19.5 | 96% | -0.4 mm |
| US 20 | 371 mm | US 20 | 96% | -0.4 mm |
| US 20.5 | 376 mm | US 20.5 | 96% | -0.4 mm |
| US 21 | 380 mm | US 21 | 96% | -0.4 mm |
| US 21.5 | 384 mm | US 21.5 | 96% | -0.4 mm |
| US 22 | 388 mm | US 22 | 96% | -0.4 mm |
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Frequently Asked Questions
How does the Air Max Plus size compare to the Air Monarch IV?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Air Max Plus has an internal fit offset of 0.12mm compared to -0.24mm for the Air Monarch IV.
Do these shoes fit wide feet comfortably?
The Air Max Plus has a roomy/wide width profile, while the Air Monarch IV is snug/narrow.