True-to-Size Millimeter Sizing Comparison
Under Armour Charged Assert 10 vs Under Armour Charged Surge
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 Charged Assert 10 to see your calculated size in the Charged Surge.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Charged Assert 10 (US) | Internal Cavity | Charged Surge Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 7 | 263 mm | US 7.5 | 88% | -1.0 mm |
| US 7.5 | 266 mm | US 8 | 88% | -1.0 mm |
| US 8 | 269 mm | US 8.5 | 100% | 0.0 mm |
| US 8.5 | 273 mm | US 9 | 88% | -1.0 mm |
| US 9 | 276 mm | US 9.5 | 88% | -1.0 mm |
| US 9.5 | 279 mm | US 10 | 100% | 0.0 mm |
| US 10 | 283 mm | US 10.5 | 88% | -1.0 mm |
| US 10.5 | 286 mm | US 11 | 88% | -1.0 mm |
| US 11 | 289 mm | US 11.5 | 100% | 0.0 mm |
| US 11.5 | 293 mm | US 12 | 88% | -1.0 mm |
| US 12 | 296 mm | US 12.5 | 88% | -1.0 mm |
| US 12.5 | 299 mm | US 13 | 100% | 0.0 mm |
| US 13 | 303 mm | US 14 | 76% | +2.0 mm |
| US 14 | 309 mm | US 14 | 53% | -4.0 mm |
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Frequently Asked Questions
How does the Charged Assert 10 size compare to the Charged Surge?
The Charged Surge is about 4mm shorter than the Charged Assert 10. We suggest ordering 1/2 size up in Charged Surge. The Charged Assert 10 has an internal fit offset of -4mm compared to -8mm for the Charged Surge.
Do these shoes fit wide feet comfortably?
The Charged Assert 10 has a standard medium width profile, while the Charged Surge is standard medium.