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Shoe Size Conversion | Convert US, UK, EU, and cm Sizes

Converts shoe sizes between US, UK, EU, and centimetre systems. Enter a size in any system and choose whether it is for men, women, or kids, and the tool returns the equivalent sizes in every other system, with the measurement in centimetres, so international online shopping fits first time.

Last updated: June 2026 · Free · No sign-up required

Results

Enter values above and click Calculate to see your result instantly.

Quick reference

Women's shoe size conversion:

USUKEUCM
6436–3722.5
7537–3823.5
8638–3924.5
974025.5

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Interpretation guide

Men's shoe size conversion:

USUKEUCM
874126.0
984227.0
1094328.0
111044–4529.0

lightbulb Worked example

Let's say you are using the Shoe Size Conversion. Converts shoe sizes between US, UK, EU, and centimetre systems. Enter a size in any system and choose whether it is for men, women, or kids, and the tool returns the equivalent sizes in every other Enter the values that match your situation into the input fields and press calculate — using realistic numbers makes the result directly useful for you.

Result: The calculator instantly applies the formula EU size approx = (foot length in cm + ~1.5 growth allowance) x 1.5; CM = foot length and returns the result with appropriate precision.

What this means: Read the result in the context of what you are measuring. The step-by-step breakdown lets you confirm the math and understand which input most affects the outcome.

Formula & methodology

Formula: EU size approx = (foot length in cm + ~1.5 growth allowance) x 1.5; CM = foot length

The Shoe Size Conversion is built on a well-established calculation method. It uses the formula EU size approx = (foot length in cm + ~1.5 growth allowance) x 1.5; CM = foot length to turn your inputs into a reliable result. Converts shoe sizes between US, UK, EU, and centimetre systems. Enter a size in any system and choose whether it is for men, women, or kids, and the tool returns the equivalent sizes in every other system, with the The steps are shown on the page so you can follow the reasoning from input to output.

Shoe sizing differs by region and gender, so the converter maps your size across US, UK, EU, and centimeter (Mondopoint) scales. The most reliable approach is to measure foot length in centimeters and match it to the chart, because brand and shape vary. UK sizes typically run about 1 to 1.5 below US sizes, and EU sizes are roughly 1.5 times the foot length in cm.

What is the Shoe Size Conversion?

The Shoe Size Conversion is a free, browser-based everyday calculator tool that helps you Converts shoe sizes between US, UK, EU, and centimetre systems. Enter a size in any system and choose whether it is for men, women, or kids, and the tool return. Instead of working through the math by hand or in a spreadsheet, you enter your values and the calculator returns an accurate result instantly — while still showing the formula and the steps so you can verify the reasoning. It is designed for quick everyday use: no sign-up, no installation, and everything runs locally in your browser for complete privacy.

How to use the Shoe Size Conversion

  1. Enter the required values into the input fields.
  2. Press the calculate button — the result appears immediately, updated live as you change any value.
  3. Read the step-by-step breakdown below the result to see exactly how the calculation was performed.
  4. Use the interpretation guide to understand what the result means for your situation, and try different inputs to see how they change the outcome.

How to use the Shoe Size Converter

Measure your foot length in centimetres from the heel to the longest toe, ideally at the end of the day when feet are slightly swollen, then enter it along with the sizing system you want — US, UK, EU, or Mondopoint. The tool converts with the standard relationships: EU size ≈ (foot length in cm + ~1.5 cm growth allowance) × 1.5, and Mondopoint equals the foot length in millimetres. US men's, US women's, and UK sizes each use their own offset, which the calculator applies automatically.

Interpreting your result

Size systems are not interchangeable — a US men's 10 is a UK 9.5, a US women's 11.5, and roughly a EU 43, so buying across borders without conversion is a common source of returns. Foot length in millimetres (Mondopoint) is the only truly objective measure, which is why it is the ISO standard for athletic shoes. The tool gives the conversion plus the width guidance where available; remember that shoes also vary by brand and last shape, so the converted size is a strong starting point, not a guarantee.

Common mistakes to avoid

The most common error is assuming US men's and women's sizes are the same — women's sizes run about 1.5 larger (a women's 9.5 fits like a men's 8). Second, ignoring the growth allowance: adding 1.5 cm for comfort is standard in EU sizing but inflates the number if you measure without it. Third, measuring in the morning or while sitting, which can understate your size by half a size or more. Finally, buying the converted size blindly across brands — always check the brand's own size chart, since lasts differ.

Tips for best results

Measure both feet and use the larger one — most people have a half-size difference. Add about 0.5–1 cm of toe room for comfort rather than a tight fit. For online shopping, compare the Mondopoint millimetres rather than the US/UK letters, because that is the measurement brands publish most consistently. Shop at the end of the day when feet are at their largest. When in doubt between two sizes, choose the larger for closed-toe shoes and the smaller for sandals that need grip.

Authoritative source: timeanddate.com

Frequently asked questions

How do I convert US to EU shoe size?
Enter the required values into the input fields and press the calculate button. The tool applies the formula EU size approx = (foot length in cm + ~1.5 growth allowance) x 1.5; CM = foot length and returns the result with a short explanation of each step, so you can check the working yourself.
How do I measure my foot size?
Stand on a piece of paper with your heel against the wall, mark the longest toe, and measure the distance to the wall in centimetres. Measure both feet and use the longer one. Measure at the end of the day when feet are slightly swollen, and add a small allowance for toe room. The calculator converts the foot length directly to your size in any system.
Why is my size different across brands?
The Shoe Size Conversion is free, private, and accurate: it runs entirely in your browser (no uploads, no accounts), applies the standard calculation, and explains each step so you can verify the result. Converts shoe sizes between US, UK, EU, and centimetre systems. Enter a size in any system and choose whether it is for men, women, or kids, and the tool returns the equivalent sizes in every other system, with the measurement in centimetres, so international There is no limit on usage, and it works on any device.
What's the difference between US men's and women's sizes?
US women's sizes run about 1.5 sizes larger than men's for the same foot length: a US men's 8 is approximately a US women's 9.5. The conversion is not a universal factor across all brands, but the 1.5 offset is the standard rule of thumb. The calculator applies the correct offset when you switch between men's and women's sizing.
How much room should shoes have?
Aim for about half an inch (1–1.3 cm) of space between your longest toe and the shoe's end — enough to wiggle toes but not slide. For running shoes, the thumb-width rule (roughly 1 cm of room) is standard because feet swell and slide forward when running. The calculator includes the recommended allowance when converting foot length to size.
What does the Shoe Size Conversion do?
Converts shoe sizes between US, UK, EU, and centimetre systems. Enter a size in any system and choose whether it is for men, women, or kids, and the tool returns the equivalent sizes in every other system, with the measurement in centimetres, so international. The calculator takes your inputs, applies the standard calculation, and returns a clear result so you can make an informed decision without doing the math by hand.
What formula does the Shoe Size Conversion use?
The Shoe Size Conversion applies the standard formula: EU size approx = (foot length in cm + ~1.5 growth allowance) x 1.5; CM = foot length. The tool walks through each step of the calculation so you can verify the numbers yourself.
Is the Shoe Size Conversion free and private?
Yes — the Shoe Size Conversion. There is no sign-up, no paywall, no trial, and no limit on how many calculations you can run. CalcaTools covers its costs with non-intrusive display advertising, so the calculator itself never asks for payment or restricts any feature.
How accurate is the Shoe Size Conversion?
The Shoe Size Conversion applies the standard formula: EU size approx = (foot length in cm + ~1.5 growth allowance) x 1.5; CM = foot length. It is tested against published worked examples before launch and uses native double-precision arithmetic, so results are accurate to typical precision for the values you enter — with no intermediate rounding that could distort the answer.

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