The following three formulas are used to calculate your shoe size based on your foot length. USM= (3 * L) - 22 U SM = (3 ∗ L) − 22. USF= (3 * L) - 21 U SF = (3 ∗ L) − 21. USC= (3 * L) - 9.67 U SC = (3 ∗ L) − 9.67. Where L is the length in inches. USM is men's size. USF is females size. USC is children's size. Shoe Size Definition.
EU Shoe Size: EU‑Shoe size = (Foot length cm + 2 × 0,667) / 0,667 EU‑Shoe size = (22 + 2 × 0,667) / 0,667 EU‑Shoe size = (22 + 1.334) / 0,667 EU‑Shoe size = 23.434 / 0,667 EU‑Shoe size = 35. UK Shoe Size: Performing foot inches to shoe size conversions: UK‑Shoe size = (3 × inches) - 23
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