About

This tool converts Chinese Shoe Sizes (both the modern GB/T Mondopoint standard and the older Euro-based system) to US, UK, and European standards. Unlike simple multipliers, shoe sizing varies by manufacturer and foot shape. This calculator uses the L (Foot Length) correlation based on ISO 9407 to provide the most accurate fit estimation.

The modern Chinese standard (CN) is based on foot length in millimeters. For example, a size 255 represents a foot length of 255 mm. Older Chinese shoes may use a system similar to EU sizes (e.g., 41). This tool automatically detects the scale based on your input.

Note: Athletic brands (Nike, Adidas) often have slight deviations. Always prioritize the mm or cm measurement printed on the tongue label for the best accuracy.

Formulas

The approximate conversion from Foot Length L (in inches) to US Men's size S is:

S≈3×L−22

However, the modern Chinese system (CN) is defined directly by millimeters:

CN Size = L_mm

To convert CN (mm) to Inches:

L_in = L_mm25.4

Reference Data

CN (mm)	US Men	US Women	UK	EU	Foot Length (in)
220	-	5.0	2.5	35	8.66
225	-	5.5	3.0	35.5	8.86
230	4.0	6.0	3.5	36	9.06
235	4.5	6.5	4.0	37	9.25
240	5.5	7.5	5.0	38	9.45
245	6.5	8.0	6.0	39	9.65
250	7.0	8.5	6.5	40	9.84
255	7.5	9.0	7.0	41	10.04
260	8.5	10.0	8.0	42	10.24
265	9.5	11.0	9.0	43	10.43
270	10.0	11.5	9.5	44	10.63
275	10.5	12.0	10.0	45	10.83
280	11.0	12.5	11.0	46	11.02
285	12.0	13.5	11.5	47	11.22
290	12.5	14.0	12.0	48	11.42
295	13.0	15.0	13.0	49	11.61
300	14.0	-	13.5	50	11.81

Frequently Asked Questions

CN 255 stands for a foot length of 255 millimeters (25.5 cm). In US sizes, this corresponds to roughly a Men's 7.5 or Women's 9.0.

Not exactly. While older Chinese sizes (e.g., 40) look like EU sizes, they often run smaller or wider due to different lasts. The modern Chinese standard uses millimeters (e.g., 250), which is more precise.

Place your heel against a wall on a piece of paper. Mark the tip of your longest toe. Measure the distance in millimeters. This is your CN size (e.g., 260mm).

Major brands often have their own "vanity sizing". However, the "JP" or "CHN" size on the label is almost always the foot length in millimeters. Use that number in this converter for the best result.

Always size up. If your foot is 263mm, the 260 shoe will be too tight. Choose size 265 (US 9.5) for comfort, especially if you plan to wear socks.