Conversions
Length converter
Convert metres into common length units.
Calculators / Conversions / Shoe size estimate
Shoe size estimate calculator
Apply a user-supplied conversion offset to a shoe size.
On this page
Estimated target size10
Calculator controls
How to calculate
Apply a user-supplied conversion offset to a shoe size.
Estimated target size = size+offset
Worked example
Source shoe size: 9; Target system offset: 1.
Estimated target size: 10 .
Assumptions and limits
Shoe sizing is not globally standardized and brands use different lasts. Use the manufacturer’s chart and foot length.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Apply a user-supplied conversion offset to a shoe size. The displayed figures use the inputs and formula shown on this page.
When this tool is useful
Use the shoe size estimate to compare a scenario, check an estimate, or verify a manual calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Source shoe size | Enter a number of at least 0 and no more than 30. |
| Target system offset | Enter a number of at least -20 and no more than 20. |
Frequently asked questions
What should I check before using the shoe size estimate result?
Shoe sizing is not globally standardized and brands use different lasts. Use the manufacturer’s chart and foot length.
Is this shoe size estimate result exact?
It is exact for the stated mathematical model and entered values. Real-world results can differ when rates, timing, fees, definitions or measurement conditions differ.