The shoe size conversion calculator takes foot length in millimeters and returns us / ca / au women (1-15), foot length in inches and au men / uk (0-15). It is built for quick answers, for checking somebody else’s arithmetic, and for the moments when a formula book is not within reach.
What Is the Shoe Size Conversion Calculator?
The shoe size conversion calculator turns foot length in millimeters into us / ca / au women (1-15), foot length in inches and au men / uk (0-15).
It is a quick way to get from the numbers you have to the number you need, without setting up a spreadsheet or reaching for a formula.
How the Shoe Size Conversion Works
Each result follows from the ones before it, and the calculator shows every step, so a surprising answer can be traced back to the input that caused it.
Round your inputs to the precision you actually know, and keep more precision than that in the intermediate steps.
Getting a Result You Can Trust
Run the calculation twice with slightly different inputs. A sensible calculator moves its output in proportion; a wild change points to a unit or a decimal point problem in what you entered.
Write the inputs down next to the answer. It takes a moment and it is the difference between a number you can explain and one you cannot.
A Worked Example
Working through an example, with foot length in millimeters set to 10, the calculator returns au men / uk (0-15) of 7, and us / ca men (1-14) of 8, and us / ca / au women (1-15) of 9. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out us / ca / au women (1-15)?
Enter foot length in millimeters. The calculator then works through the relationship and reports us / ca / au women (1-15), foot length in inches and au men / uk (0-15).
What does the shoe size conversion actually calculate?
It takes foot length in millimeters and converts them into us / ca / au women (1-15), foot length in inches and au men / uk (0-15) using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter foot length in millimeters?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Why does a small change in one value move the answer so much?
That happens when an output depends on a ratio, because dividing by a small number magnifies any change in it. Check the units first, then check whether the value you entered is in the range the relationship was designed for.
Does anything you type get stored?
No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.