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 | 266 mm | US 7 | 98% | -0.2 mm |
| US 7.5 | 269 mm | US 7.5 | 98% | -0.2 mm |
| US 8 | 272 mm | US 8 | 98% | -0.2 mm |
| US 8.5 | 276 mm | US 8.5 | 98% | -0.2 mm |
| US 9 | 279 mm | US 9 | 98% | -0.2 mm |
| US 9.5 | 282 mm | US 9.5 | 98% | -0.2 mm |
| US 10 | 286 mm | US 10 | 98% | -0.2 mm |
| US 10.5 | 289 mm | US 10.5 | 98% | -0.2 mm |
| US 11 | 292 mm | US 11 | 98% | -0.2 mm |
| US 11.5 | 296 mm | US 11.5 | 98% | -0.2 mm |
| US 12 | 299 mm | US 12 | 98% | -0.2 mm |
| US 12.5 | 302 mm | US 12.5 | 98% | -0.2 mm |
| US 13 | 306 mm | US 13 | 98% | -0.2 mm |
| US 14 | 312 mm | US 14 | 98% | -0.2 mm |
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Frequently Asked Questions
How does the Charged Assert 10 size compare to the Charged Surge?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Charged Assert 10 has an internal fit offset of -0.88mm compared to -1.08mm for the Charged Surge.
Do these shoes fit wide feet comfortably?
The Charged Assert 10 has a snug/narrow width profile, while the Charged Surge is standard medium.