Millimetre length
Foot length in mm with your phone
Shoe charts care about millimetres. A phone AR scan reports heel-to-toe length in mm (plus ball girth) so you can map to EU/US/UK charts without squinting at a paper ruler.
Last updated October 2026 · arfits.com editorial
Manual method: trace the foot and measure heel-to-longest-toe in millimetres with a ruler. Phone method: complete the guided AR scan; length is the primary size input. Existing ARFits scanning copy states length and ball girth to within ±2 mm of a podiatrist scan (about 99% accuracy) when guidance, lighting, and surface are adequate.
From mm to a size label
- Capture length (mm) for both feet; use the longer foot.
- Capture ball girth when possible — width changes size choice.
- Run shoe size converter for chart mapping.
- For a specific brand/model, prefer size recommender offsets.
Do not invent tighter tolerances
This page intentionally reuses the on-site ±2 mm / ~99% language from the foot-scanning explainer. No new millimetre marketing claims.
Manual mm tips and common tracing mistakes: how to measure foot size.
Frequently asked questions
Should I measure one foot or both?
Both. Feet often differ; size from the longer foot and consider girth differences.
Is millimetre length enough alone?
Length is primary, but ball girth / width is why two feet with the same length can need different sizes.
Where is the ±2 mm claim from?
From the existing how-foot-scanning-works content on arfits.com — reused here, not newly invented.