True-to-Size Millimeter Sizing Comparison

Nike Run Swift 3 vs On Cloud 6

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

Shoe Awomen
Nike Run Swift 3
4.8(230 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Run Swift 3 Breakdown
Shoe Bwomen
On Cloud 6
4.0(384 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Cloud 6 Breakdown
Fit Verdict

True to Size Comparison

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

Length Delta+0.28 mm
Width Delta+0.15 mm

Interactive Size Converter

Select what size you wear in the Run Swift 3 to see your calculated size in the Cloud 6.

Recommended Size in On Cloud 6
EU 4785% Match

Internal shoe cavity difference: +1.3 mm (slightly roomier)

Complete Size Conversion Matrix

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

Run Swift 3 (US)Internal CavityCloud 6 EquivalentMatch AccuracyFit Difference
US 5232 mmEU 362%+8.3 mm
US 5.5236 mmEU 3649%+4.3 mm
US 6240 mmEU 3697%+0.3 mm
US 6.5245 mmEU 36.580%-1.7 mm
US 7249 mmEU 37.585%+1.3 mm
US 7.5253 mmEU 3897%+0.3 mm
US 8257 mmEU 38.597%+0.3 mm
US 8.5261 mmEU 3991%-0.7 mm
US 9266 mmEU 4085%+1.3 mm
US 9.5270 mmEU 40.597%+0.3 mm
US 10274 mmEU 4191%-0.7 mm
US 10.5278 mmEU 4273%+2.3 mm
US 11283 mmEU 42.597%+0.3 mm
US 11.5287 mmEU 4397%+0.3 mm
US 12291 mmEU 4473%+2.3 mm
US 12.5295 mmEU 4480%-1.7 mm
US 13299 mmEU 4585%+1.3 mm
US 13.5304 mmEU 4661%+3.3 mm
US 14308 mmEU 4691%-0.7 mm
US 14.5312 mmEU 4785%+1.3 mm
US 15316 mmEU 47.597%+0.3 mm
US 15.5321 mmEU 4880%-1.7 mm
US 16325 mmEU 4832%-5.7 mm
US 16.5329 mmEU 480%-9.7 mm
US 17333 mmEU 480%-13.7 mm
US 17.5338 mmEU 480%-18.7 mm
US 18342 mmEU 480%-22.7 mm
US 18.5346 mmEU 480%-26.7 mm
US 19350 mmEU 480%-30.7 mm
US 19.5355 mmEU 480%-35.7 mm
US 20359 mmEU 480%-39.7 mm
US 20.5363 mmEU 480%-43.7 mm
US 21367 mmEU 480%-47.7 mm
US 21.5371 mmEU 480%-51.7 mm
US 22376 mmEU 480%-56.7 mm
US 22.5380 mmEU 480%-60.7 mm
US 23384 mmEU 480%-64.7 mm
US 23.5388 mmEU 480%-68.7 mm

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Frequently Asked Questions

How does the Run Swift 3 size compare to the Cloud 6?

Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Run Swift 3 has an internal fit offset of -0.48mm compared to -0.2mm for the Cloud 6.

Do these shoes fit wide feet comfortably?

The Run Swift 3 has a snug/narrow width profile, while the Cloud 6 is roomy/wide.