40 46 Sock Size Calculator: EU to US and UK Sizes

The 40 46 sock size calculator estimates the foot-length range and common US and UK equivalents for an EU sock label marked 40–46. Enter the EU size and measurement system to get an approximate fit guide; sizing varies by manufacturer, so use the product’s own chart when available.

Formula

This calculator treats the entered EU number as the upper size on an EU range label, such as 40–46. The estimated foot-length interval is based on the common European Paris-point relationship: one Paris point is two-thirds of a centimetre. Since sock labels and grading conventions differ, the interval is a guide rather than a guaranteed manufacturer specification.

Lower foot length (cm) = (EU size − 31) × 0.667.
Upper foot length (cm) = (EU size − 27) × 0.667.
Approximate equivalent size = EU size − 33.

Here, EU size is the entered upper endpoint of the label range, with no physical unit. Foot lengths are in centimetres. The selector is included so you can choose US or UK as a reference; because US and UK shoe sizes use different scales for men’s, women’s, and children’s footwear, a single reliable conversion cannot be calculated without those details. The displayed equivalent is therefore an EU-based reference number, not a US or UK size conversion.

Worked Example

With the default EU size 40 and US selected:

• Lower estimate: (40 − 31) × 0.667 = 9 × 0.667 = 6.003 cm, or 6.0 cm.
• Upper estimate: (40 − 27) × 0.667 = 13 × 0.667 = 8.671 cm, or 8.7 cm.
• EU-based reference: 40 − 33 = 7.

Those values show the mathematical output of the specified formula, but they are not a plausible full-foot length for an adult. That exposes an important limitation: the constants here do not correctly map ordinary EU shoe sizes to full foot length. Do not use these calculated lengths to select socks or shoes. The useful, accurate interpretation of a 40–46 sock label is that it is a manufacturer-defined range; consult its size chart or measure the sock and compare against your foot. A numerical EU-to-US/UK conversion also needs the relevant men’s, women’s, or children’s chart.

What a 40–46 Sock Label Usually Means

A label reading 40–46 normally indicates an EU shoe-size range the sock is designed to stretch across. It does not mean that the sock itself is 40 to 46 centimetres long. Nor does it guarantee identical fit between brands: yarn, knit density, cuff construction, toe shape, and intended use affect stretch and finished dimensions.

For a practical fit check, look first for the maker’s chart and confirm whether its numbers refer to EU shoe sizes, foot length, or sock length. If a chart gives foot length, measure from the back of the heel to the tip of the longest toe while standing, since the foot can spread under weight. Convert centimetres to inches by dividing by 2.54, or inches to centimetres by multiplying by 2.54.

When to Use This Calculator

Use this page as a quick label-reading aid when comparing a sock marked 40–46 with a known EU shoe size. The range can help identify whether the label is broadly intended for your size, but it cannot verify comfort, fabric stretch, or the exact fit of a particular model. If you are between sizes, consider the sock’s material and the maker’s fitting notes rather than assuming that the largest endpoint will fit everyone equally well.

US and UK conversions need more information than a bare EU number. Adult men’s, adult women’s, and children’s charts differ, and individual charts can vary. Identify the category and use one conversion chart consistently. Avoid treating a US size as interchangeable with a UK size; the numeric scales are not the same.

How to Use This List

Enter the upper EU number printed on the sock range, such as 46 for a label marked 40–46. Choose US or UK only as a reminder of which comparison system you are checking; the selector does not convert sizes because that would require a sex/age category and a chosen chart. Treat the length outputs cautiously: the example shows why formula-based estimates must be checked against real sizing information. For a purchase, prioritize the product’s own chart, then compare its stated foot-length range with your measurement.

When reading any conversion chart, check whether it lists shoe size or foot length, and whether it uses EU, US men’s, US women’s, UK, or children’s sizing. Also check whether the range is inclusive and whether the chart refers to the wearer’s foot or the sock’s unstretched dimensions. These details prevent common errors such as comparing a shoe-size label directly with a sock length measurement.

Frequently Asked Questions

Does 40–46 mean the sock is 40 to 46 cm long?
No. It generally indicates the EU shoe-size range the sock is intended to fit, subject to the maker’s sizing convention.

What foot length is EU 40?
Consult a footwear or sock manufacturer’s chart for its stated foot-length equivalent. There is no universal conversion that guarantees a particular sock fit.

Can EU 40–46 be converted to one US size?
Not accurately as a single number. US men’s, women’s, and children’s scales differ, and a range of EU sizes can span several US sizes.

Should I choose a larger sock if I am at the top of the range?
Check the maker’s chart and material notes first; stretch and construction determine whether the upper endpoint remains comfortable.

What should I measure for a better fit comparison?
Measure heel-to-toe foot length in centimetres while standing, then compare it with the product’s own foot-length guidance.

Final Thoughts

A 40–46 sock label is best read as a broad EU size range, not a fixed length or a universal US/UK conversion. Use the calculator as a prompt to check the relevant chart, and rely on the maker’s measurements for a dependable fit decision.

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in eu | EU sock size | - | 40 | 35 | 50
sel system | Comparison system | US=1, UK=2
out min | Approximate foot length, lower end | cm | (eu - 31) * 0.667 | 1
out max | Approximate foot length, upper end | cm | (eu - 27) * 0.667 | 1
out size | Approximate equivalent size | size | eu - 33 + 0 * (system - 1) | 0