Convert measured foot width between units, estimate adult US men’s shoe size from measured length, or compare size and length using an approximate model.

Measure across the widest part of your forefoot. Width cannot be inferred from shoe size.

Optional in shoe-size modes; blank omits width conversion.

Related Calculators

US Men's Shoe Size vs. Foot Length (Approximate Formula)

This calculator uses an approximate adult US men's model relating size to measured foot length in inches. It is not a universal brand sizing standard; compare your measurements with the specific brand/model chart:

SS โ‰ˆ 3 ร— FLแตขโ‚™ - 22

The inverse gives a nominal length under the same model, not a measurement of an actual foot:

FLแตขโ‚™ โ‰ˆ (SS + 22) / (3)

Variables:

  • SS is the US Men's shoe size
  • FLin is the foot length in inches

Foot width note: Foot width is not uniquely determined by shoe size and foot length. Shoe widths are typically given as width codes (for example, D, EE) and the mapping between codes and inches varies by brand and model. For best results, measure foot width directly and consult the specific brandโ€™s width chart.

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 determine (measure) foot width.

  1. Stand on a sheet of paper with your full weight on the foot you are measuring (wear the type of socks you plan to use).
  2. Mark the widest points of your forefoot (across the ball of the foot) and measure the distance between the marks to get your foot width (FW).
  3. Measure foot length (FL) from the back of the heel to the longest toe.
  4. Choose the relevant solve mode to convert measured width, estimate US men's size, estimate nominal length from size, or compare size with measured length. Shoe-size estimates use the calculator's nearest-half convention; this is not a fitting recommendation.
  5. For shoe shopping, compare your measurements to the specific brand/model sizing chart (width codes and fit vary by manufacturer).

Example Problem:

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

Foot length (FL) = 10.5 inches

Estimated US Men's shoe size (SS) โ‰ˆ 3 ร— 10.5 โˆ’ 22 = 9.5

Measured foot width (FW) = 4.0 inches (which is 4.0 ร— 2.54 = 10.16 cm)