What is a shoe size conversion calculator?
A shoe size conversion calculator helps relate a measured foot length to a shoe sizing system. Different regions and manufacturers use different size labels, which can make shoe shopping confusing.
This calculator uses your foot length in centimeters and an additional allowance to produce an illustrative European shoe size. It also displays the foot length in millimeters, which is useful when comparing measurements with Mondopoint-style sizing information.
Unlike a complete US, UK and EU size chart, this specific calculator does not directly output US or UK shoe sizes.
Enter the actual heel-to-toe length of your foot in centimeters.
Estimate a European shoe size using the selected length allowance.
Express your measured foot length in millimeters.
How to use the shoe size calculator
- Measure your foot. Find the distance from your heel to the tip of your longest toe.
- Enter foot length. Type the measurement in centimeters. For example, enter 26 for a 26 cm foot.
- Choose the allowance. Enter a last-length allowance between 0 and 3 centimeters.
- Calculate. Select Calculate to display the results.
- Compare with the brand. Use the manufacturer's official size chart before choosing a shoe.
Shoe size conversion formula
The calculator uses a simplified EU-size estimate based on the European Paris-point scale. One Paris point equals two-thirds of a centimeter, so multiplying a length in centimeters by 1.5 produces a corresponding Paris-point count.
Approximate EU shoe size
EU size estimate = (Foot length in cm + Allowance in cm) × 1.5
The allowance represents the difference between the measured foot length and the illustrative shoe-last length used by this formula.
Mondopoint length in millimeters
Foot length in mm = Foot length in cm × 10
Mondopoint sizing is based on foot measurements in millimeters. A full Mondopoint designation may also specify foot width; this calculator reports the length component only.
Worked example: 26 cm foot length
Example inputs
- Foot length: 26 cm
- Last-length allowance: 1.5 cm
Step 1: Calculate the estimated EU size
EU size = (26 + 1.5) × 1.5
EU size = 27.5 × 1.5
Approximate EU size = 41.25
Step 2: Calculate the length in millimeters
Mondopoint length = 26 × 10
Mondopoint length = 260 mm
Result interpretation
The formula produces an EU-size estimate of 41.25, not a guaranteed retail shoe size. A manufacturer may offer whole or half sizes and may use a different fit allowance. Compare the 260 mm foot measurement with the brand's published size chart.
Foot length to approximate EU size table
The following table applies the calculator's illustrative formula using a fixed 1.5 cm last-length allowance. These are mathematical estimates, not official manufacturer size recommendations.
| Foot length (cm) | Foot length (mm) | EU estimate |
|---|---|---|
| 22.0 | 220 | 35.25 |
| 22.5 | 225 | 36.00 |
| 23.0 | 230 | 36.75 |
| 23.5 | 235 | 37.50 |
| 24.0 | 240 | 38.25 |
| 24.5 | 245 | 39.00 |
| 25.0 | 250 | 39.75 |
| 25.5 | 255 | 40.50 |
| 26.0 | 260 | 41.25 |
| 26.5 | 265 | 42.00 |
| 27.0 | 270 | 42.75 |
| 27.5 | 275 | 43.50 |
| 28.0 | 280 | 44.25 |
| 28.5 | 285 | 45.00 |
| 29.0 | 290 | 45.75 |
| 29.5 | 295 | 46.50 |
| 30.0 | 300 | 47.25 |
How to measure your foot length accurately
Accurate foot measurements help you compare sizes across different shoe brands. You can measure at home using a sheet of paper, a pencil and a ruler.
- Place a sheet of paper on a hard, flat floor against a wall.
- Stand on the paper with your heel gently touching the wall.
- Keep your weight on the foot being measured.
- Mark the position of your longest toe.
- Measure the distance from the wall-side edge of the paper to the mark.
- Repeat for your other foot.
- Use the larger measurement when comparing with a manufacturer's size chart.
For shoes worn with socks, follow the manufacturer's measuring instructions, including whether to measure with socks.
What is Mondopoint shoe sizing?
Mondopoint is a footwear sizing approach based on actual foot dimensions, usually expressed in millimeters.
For example, a measured foot length of 26 centimeters corresponds to 260 millimeters.
A full Mondopoint size designation can include both foot length and width. This calculator converts only the length measurement; it does not calculate foot width or assess overall fit.
EU, US and UK shoe sizes explained
Shoe sizing systems differ between regions. European sizes are commonly associated with Paris points, while US and UK systems traditionally use barleycorn-based size increments.
US shoe sizes can also differ between men's, women's and children's categories. Even shoes carrying the same regional size label may fit differently depending on the manufacturer.
This calculator provides an approximate EU-size result and foot length in millimeters. It does not produce direct US or UK shoe size conversions.
For a purchase involving another sizing system, use the specific manufacturer's chart for the model you intend to buy.
What is last-length allowance?
A shoe last is a three-dimensional form used during footwear design and manufacture. The length of a shoe last is not necessarily the same as the measured length of the foot.
The allowance in this calculator is an illustrative difference between the foot length and the last length.
Changing the allowance changes the estimated EU-size result, but does not change the measured foot length or its millimeter conversion.
How allowance changes the estimate
For a measured foot length of 26 cm:
| Allowance | Estimated EU size |
|---|---|
| 0.5 cm | 39.75 |
| 1.0 cm | 40.50 |
| 1.5 cm | 41.25 |
| 2.0 cm | 42.00 |
These values demonstrate the formula. They are not recommendations for how much space a particular shoe should provide.
Why shoe sizes vary between brands
Shoe sizes are labels rather than exact guarantees of fit. Different manufacturers can use different shoe lasts, internal dimensions and fitting standards.
Important differences include:
- Foot width: Narrow and wide feet may need different footwear even at the same length.
- Toe-box shape: Pointed, rounded and anatomical toe boxes can feel different.
- Shoe type: Running shoes, boots, dress shoes and sandals may fit differently.
- Brand conventions: Size labels and recommended foot lengths may not match across brands.
- Children's sizing: Growing feet require appropriate fit checks rather than relying only on an adult sizing estimate.
Common shoe sizing mistakes
- Using the size label from one brand as an exact match for every other brand.
- Measuring only one foot when the two feet have different lengths.
- Confusing foot length with shoe-last length.
- Ignoring width and toe-box fit.
- Treating a decimal EU estimate as an available retail size.
- Assuming a mathematical conversion guarantees comfort or fit.
Accuracy and limitations
The centimeters-to-millimeters conversion is exact: one centimeter equals ten millimeters.
The EU-size calculation is an illustrative model based on the entered allowance. Actual commercial sizing may use different allowances, rounding conventions or manufacturer-specific charts.
This calculator does not account for foot width, arch shape, medical foot conditions, or the internal dimensions of a particular shoe model.
Frequently asked questions
How do I calculate my EU shoe size from foot length?
This calculator uses the illustrative formula: EU size = (foot length in cm + allowance in cm) × 1.5. The result should be checked against the shoe manufacturer's size chart.
What EU shoe size is a 26 cm foot?
With the calculator's default 1.5 cm allowance, a 26 cm foot produces an approximate EU-size value of 41.25. This is a formula result, not a guaranteed retail shoe size.
What is 26 cm in Mondopoint length?
26 cm equals 260 mm. The calculator reports this length component without a separate foot-width measurement.
Does this calculator convert US to UK shoe sizes?
No. The current tool estimates EU size from foot length and allowance and displays foot length in millimeters. It does not directly convert US or UK sizes.
What is last-length allowance?
It is the additional length included in this calculator's illustrative shoe-last calculation. The appropriate allowance can vary by footwear design and manufacturer.
Should I measure both feet?
Yes. Foot lengths may differ. Measure both feet and consult the brand's guidance using the larger measurement.
Why is my calculated EU size a decimal?
The formula returns a mathematical estimate. Actual shoe sizes are sold in the increments offered by the manufacturer, which may not correspond exactly to the result.
Can I use this calculator for children's shoes?
The formula can produce a numerical estimate from a child's foot measurement, but it is not a dedicated children's sizing system. Use the manufacturer's age-appropriate measurement and fitting guidance.
Does Mondopoint include foot width?
A full Mondopoint designation may include length and width. This tool reports the foot-length component only.
Are my foot measurements uploaded?
The calculator is designed to perform the calculation in your browser. Website analytics and advertising may operate separately.
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