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Shoe Size Conversion

Use this shoe size conversion calculator to convert compatible units or encoded values for shoe size conversion.

Primary answer
Mondopoint estimate
Inputs to verify
Foot length
Use type
Use as an estimate that depends on assumptions.
Keyword intent
shoe size conversion calculator

Calculator

Shoe Size Conversion

Calculates mondopoint estimate from foot length. Defaults are filled in so you can review a working example before changing inputs.

mm

Adult foot length in millimeters, measured from heel to longest toe.

Result

Result reflects the current submitted inputs.

  • Risk B
  • Reviewed 2026-05-26
  • 3 sources
Mondopoint estimate260 mm
EU size estimate41
UK size estimate7.5
U.S. men's estimate8.5
U.S. women's estimate9.5
Foot length26 cm
Foot length10.2362 in
Fit noteApproximate adult conversion only; brand charts, width, last shape, socks, and materials can change the best size.

Breakdown

EU raw estimate
40.9805
UK raw estimate
7.6966
Rounding
nearest half size
  • This packet covers adult foot lengths from 210 mm to 322 mm only.
  • Foot length means measured heel-to-longest-toe length, ideally using the longer foot.
  • Size estimates are approximate starting points, not a fit guarantee.
  • Brand-specific lasts, width, socks, materials, and country-specific labeling can change the best size.
  • Children's sizing and medical/podiatry fitting concerns are outside this packet.
  • Final purchase decisions should check the brand's own chart and return policy.

Accuracy notes

Risk level
B
Reviewed
2026-05-26
Sources
3
Primary result
Mondopoint estimate

Formula logic is kept in a pure calculator module with fixtures, source notes, and page-visible assumptions.

Categories

What the result means

Mondopoint estimate answers the page's main shoe size conversion question. Foot length rounded to the nearest 5 mm. Read the converted value first, then verify the source unit, target unit, and factor before reusing the number. Use EU size estimate, UK size estimate, and u.s. men's estimate to explain why mondopoint estimate moved when an input changed. Keep the original value next to the converted value when using it in a workflow.

Mondopoint estimateFoot length rounded to the nearest 5 mm.
EU size estimateApproximate adult European/Paris-point size rounded to the nearest half size.
UK size estimateApproximate adult UK size rounded to the nearest half size.
U.S. men's estimateApproximate adult U.S. men's size based on the rounded UK estimate plus 1.

Use the result this way

  1. Start with Mondopoint estimate, then use supporting outputs only to explain the primary answer.
  2. Verify foot length before copying the result.
  3. Keep units consistent with the labels shown in the form and stay within the documented minimum and maximum ranges.
  4. Keep the original value next to the converted value when using it in a workflow.

User job

How to use this calculator

Use Shoe Size Conversion when you need mondopoint estimate, then use eu size estimate and uk size estimate to check the context for unit checks, engineering notes, recipes, travel, shopping, and measurement cleanup.

Best for

  • Converting compatible units
  • Auditing the factor used for a repeated conversion
  • Reviewing a default example before entering your own foot length.

Check before relying

  • Make sure the source and target units measure the same kind of quantity.
  • This packet covers adult foot lengths from 210 mm to 322 mm only.
  • Foot length means measured heel-to-longest-toe length, ideally using the longer foot.
  • Source context: International Organization for Standardization, reviewed 2026-05-26.

Next useful step

Formula

For adult foot length in millimeters, estimate EU = (length + 2 x 6.67) / 6.67 and UK = (length + 2 x 8.47) / 8.47 - 25, rounded to the nearest half size. U.S. men's = UK + 1 and U.S. women's = UK + 2. Key assumptions: This packet covers adult foot lengths from 210 mm to 322 mm only. Foot length means measured heel-to-longest-toe length, ideally using the longer foot. Size estimates are approximate starting points, not a fit guarantee.

  • For adult foot length in millimeters, estimate EU = (length + 2 x 6.67) / 6.67 and UK = (length + 2 x 8.47) / 8.47 - 25, rounded to the nearest half size. U.S. men's = UK + 1 and U.S. women's = UK + 2.
  • This packet covers adult foot lengths from 210 mm to 322 mm only.
  • Foot length means measured heel-to-longest-toe length, ideally using the longer foot.
  • Primary source context: International Organization for Standardization.

Inputs

Enter foot length for unit checks, engineering notes, recipes, travel, and measurement cleanup. Before calculating, keep units consistent with the labels shown in the form and stay within the documented minimum and maximum ranges. Foot length: Adult foot length in millimeters, measured from heel to longest toe.

Foot lengthAdult foot length in millimeters, measured from heel to longest toe.

Example

Using the default inputs, Shoe Size Conversion returns mondopoint estimate of 260. Adjust foot length to match your own scenario.

FAQ

How is mondopoint estimate calculated here?

For adult foot length in millimeters, estimate EU = (length + 2 x 6.67) / 6.67 and UK = (length + 2 x 8.47) / 8.47 - 25, rounded to the nearest half size. U.S. men's = UK + 1 and U.S. women's = UK + 2. The first assumption to check is: This packet covers adult foot lengths from 210 mm to 322 mm only.

What does Mondopoint estimate mean for shoe size conversion?

Read the converted value first, then verify the source unit, target unit, and factor before reusing the number. Secondary values such as EU size estimate, UK size estimate, and u.s. men's estimate are there to explain the primary answer, not to replace it.

What should I enter for Foot length?

Adult foot length in millimeters, measured from heel to longest toe. Use mm for this field. Keep units consistent with the labels shown in the form and stay within the documented minimum and maximum ranges.

What can make the shoe size conversion answer change?

The answer can change when inputs, units, rounding, or source assumptions change. Compare source unit, target unit, dimension compatibility, exchange or conversion rate, and rounding precision.

Why does the shoe size conversion example show 260 for mondopoint estimate?

The default inputs produce 260 for mondopoint estimate. Treat that as a format and scale check, then replace every default value with your own inputs.

How do I avoid a shoe size conversion unit-direction mistake?

Keep the original value beside the converted value, confirm both units measure the same quantity, and check whether rounding is acceptable for the task.

Sources

Last reviewed: 2026-05-26

  • Reviewed 2026-05-26
    ISO 19407:2023 Footwear - Sizing - Conversion of sizing systemsInternational Organization for Standardization. Use of foot length as the logical starting point for shoe-size conversion and the limitation that conversion tables are guidelines because sizing systems developed differently.
    Scope
    International standard for footwear size conversion systems.
    Supports
    Use of foot length as the logical starting point for shoe-size conversion and the limitation that conversion tables are guidelines because sizing systems developed differently.
  • Reviewed 2026-05-26
    ISO 19407:2023 sampleISO sample via iTeh Standards. Adult conversion interval constants and the formulas used to estimate European and UK sizes from foot length.
    Scope
    Public sample pages for the ISO footwear conversion standard.
    Supports
    Adult conversion interval constants and the formulas used to estimate European and UK sizes from foot length.
  • Reviewed 2026-05-26
    Handbook 44 Appendix C: General Tables of Units of MeasurementNational Institute of Standards and Technology. Millimeter, centimeter, and inch conversion assumptions used for foot length outputs.
    Scope
    U.S. customary and metric unit conversion reference.
    Supports
    Millimeter, centimeter, and inch conversion assumptions used for foot length outputs.

Disclaimer

This calculator is an educational estimate based on the inputs and assumptions shown on the page.