Select your gender and enter the total measurement of your foot in inches into the calculator. The calculator will evaluate your shoe size based on the length of your foot and sex.

## Shoe Size Formula

The following three formulas are used to calculate your shoe size based on your foot length.

USM= (3 * L) – 22

USF= (3 * L) – 21

USC= (3 * L) – 9.67

- Where L is length in inches
- USM is men’s size
- USF is females size
- USC is childrens size

How to calculate shoe size

**First, measure your foot**Measure the length of your foot from heal to toe in inches.

**Select the proper formula**Select the correct formula from above based on your gender.

**Calculate your shoe size**Using the length of your foot and inches, and the equation above, calculate your proper shoe size.

## FAQ

**What is a shoe size?**

A shoe size is a standard measure of unit used for estimating the size of a shoe. The reason for shoe sizes is so that individuals can purchase shoes that will fit there foot as best as possible.