True-to-Size Millimeter Sizing Comparison

Under Armour Charged Assert 10 vs Under Armour Charged Surge 4

Detailed size conversion chart, cavity measurements in millimeters, and crowd-sourced fit advice for choosing your perfect size.

Shoe Amen
Under Armour Charged Assert 10
5.0(1,691 reviews)
Fit TendencyRuns Small (-4mm)
Width ProfileStandard (Medium)
View Full Charged Assert 10 Breakdown
Shoe Bunisex
Under Armour Charged Surge 4
4.6(372 reviews)
Fit TendencyRuns Small (-4mm)
Width ProfileStandard (Medium)
View Full Charged Surge 4 Breakdown
Fit Verdict

True to Size Comparison

Both shoes share a very similar length profile. We recommend ordering your standard size in both.

Length Delta0 mm
Width DeltaIdentical

Interactive Size Converter

Select what size you wear in the Charged Assert 10 to see your calculated size in the Charged Surge 4.

Recommended Size in Under Armour Charged Surge 4
US 10.5100% Match

Internal shoe cavity difference: 0.0 mm (snugger)

Complete Size Conversion Matrix

Direct millimeter-calibrated mapping comparing all available sizes between both shoes.

Charged Assert 10 (US)Internal CavityCharged Surge 4 EquivalentMatch AccuracyFit Difference
US 7263 mmUS 7100%0.0 mm
US 7.5266 mmUS 7.5100%0.0 mm
US 8269 mmUS 8100%0.0 mm
US 8.5273 mmUS 8.5100%0.0 mm
US 9276 mmUS 9100%0.0 mm
US 9.5279 mmUS 9.5100%0.0 mm
US 10283 mmUS 10100%0.0 mm
US 10.5286 mmUS 10.5100%0.0 mm
US 11289 mmUS 11100%0.0 mm
US 11.5293 mmUS 11.5100%0.0 mm
US 12296 mmUS 12100%0.0 mm
US 12.5299 mmUS 12.5100%0.0 mm
US 13303 mmUS 13100%0.0 mm
US 14309 mmUS 14100%0.0 mm

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Frequently Asked Questions

How does the Charged Assert 10 size compare to the Charged Surge 4?

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 -4mm compared to -4mm for the Charged Surge 4.

Do these shoes fit wide feet comfortably?

The Charged Assert 10 has a standard medium width profile, while the Charged Surge 4 is standard medium.