Shoe measurement methods compared
Millimetres on the foot length axis beat every sizing label — but how you measure matters. Brannock devices, paper tracing, and printable rulers each introduce different error; we rank them by repeatability for online shoe buying.
Which foot measurement method is most accurate?
| Method | Typical error | Best for |
|---|---|---|
| Brannock device | ±2–3 mm when used correctly | In-store fitting; gold standard reference |
| Paper tracing + ruler | ±3–5 mm (pen width, posture) | Home measurement — see how to measure |
| Printable ruler (100% scale) | ±4–8 mm if printer scale wrong | Quick check only — use the calibrated printable kit and verify scale with a credit card width |
| Wall mark + tape measure | ±5 mm+ (heel slip, angle) | Rough estimate, not purchase decisions |
Should I measure in the morning or evening?
Measure in the evening when feet are largest — they swell during the day and during activity. For running shoes, add 10–12 mm toe clearance on top of your measured length.
Does Mondopoint (CM) replace US/EU?
Mondopoint (foot length in mm ÷ 10) is the ISO-aligned axis we use internally. US, UK and EU labels are generated from the same mm value — see how we calculate.