Enter the US Men’s shoe size and foot length into the calculator to determine the foot width. This calculator helps to estimate the width of your foot based on standard shoe size and foot length measurements.

Foot Width Formula

The following formula is used to estimate the foot width:

FW = (SS * 3 - 22 + (FL / 5)) / 3


  • FW is the foot width (inches)
  • SS is the US Men’s shoe size
  • FL is the foot length (inches)

To estimate the foot width, multiply the shoe size by 3, subtract 22, add the foot length divided by 5, and then divide the total by 3.

What is Foot Width?

Foot width is a measurement that indicates how wide a person’s foot is across the widest part. It is an important measurement for finding comfortable and well-fitting shoes. Foot width can vary significantly from person to person and is not always proportional to foot length or shoe size.

How to Calculate Foot Width?

The following steps outline how to estimate the Foot Width.

  1. First, determine the US Men’s shoe size (SS).
  2. Next, measure the foot length (FL) in inches.
  3. Use the formula FW = (SS * 3 – 22 + (FL / 5)) / 3 to estimate the foot width (FW) in inches.
  4. Finally, calculate the Foot Width (FW).
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

US Men’s shoe size (SS) = 10

Foot length (FL) = 10.5 inches