Sock Size Calculator - Size by Shoe Size, Age, and System

A sock size calculator turns a US, UK, or EU shoe size into the matching US sock size band and a general size name (small, medium, large, or toddler, infant, newborn for kids). It is built for everyday-life clothing questions where the only thing you usually have on hand is the shoe the sock has to fit.

• • Buying socks as a gift: Pick a size that matches the recipient's shoe size when you do not have a recent measurement.
• • Stocking up multipacks: Estimate sizes for everyone in the household using one shared chart instead of guessing labels.
• • Outfitting growing kids: Switch to age-based kids sizing when the child's shoe size keeps changing faster than the labels on hand.
• • Cross-border shopping: Convert a European or UK shoe size to a US sock size when buying from a foreign storefront.

Use it before you buy a new multipack, before you replace a lost sock, and whenever the brand you are shopping from uses a different convention than the brand you are used to.

If you also need to replace the laces on the same pair of shoes, shoelace length calculator covers the matching shoelace size for any eyelet count.

The calculator takes your shoe size in the system you know, converts it to a US shoe size internally, and then maps that US shoe size to the correct row in the men's, women's, or kids sock chart. For children, you can also size by age in months instead of by shoe size.

• audience: Adult or child. Picks the men's, women's, or kids chart.
• gender: For adults, picks the men's or women's chart. The ranges overlap in the small band.
• shoeSizeUnit: US, UK/AU, or EU. The calculator converts the entered number to a US shoe size first.
• shoeSize: Shoe size in the chosen system. For kids, ranges are smaller than for adults.
• kidsSizeMode: Choose shoe size when you have a measurement, age when you only have the child's age.
• kidsAgeMonths: Child's age in months. Used when kidsSizeMode is age.

For adult sizing, men's US and men's UK shoe sizes differ by about 1 and women's US and women's UK shoe sizes differ by about 2, and EU shoe sizes convert to US sizes through a standard offset the calculator applies in the background.

According to Omni Calculator - Sock Size, US sock sizes are based on foot length in inches, and the men's, women's, and kids sock size charts map shoe sizes in US, UK/AU, and EU systems to a US sock size band and a general size name such as small, medium, or large.

When you only have the foot length in inches, shoe size converter turns that single measurement into US, UK, and EU shoe sizes you can paste back into the sock size input.

Four ideas that explain why sock size labels look the way they do.

These four ideas line up with the same one-size-or-measurement trade-off behind every clothing chart: when the printed label is ambiguous, a fresh body or foot measurement is more reliable than the size on the package.

Both rely on a band plus a general size label, which is the same trade-off the clothing size converter faces when a label like small or medium has to be translated into a numeric US, UK, or EU size.

A short walkthrough that covers adult men, adult women, and kids in age or shoe-size mode.

1. 1 Pick the audience: Choose Adult for men or women, or Child to size socks for a younger person.
2. 2 Set gender or kids size mode: Adults pick Man or Woman. Kids pick By shoe size or By age depending on what you have available.
3. 3 Choose a shoe size system: Pick the system printed on the shoe you already own: US, UK / AU, or EU. The calculator converts internally.
4. 4 Enter the shoe size or age: Type the size for shoe-mode inputs, or the age in months for kids age mode. 0-132 months covers newborn to 11 years.
5. 5 Read the result: The calculator returns a US sock size band (like 9-11) and a general size name (Small). For kids, the size name may also be Toddler, Infant, X-Small, or Newborn.

For an adult man with a US shoe size 10, set audience to Adult, gender to Man, shoe size system to US, and shoe size to 10. The result is 10-13 (Medium). For a 3-year-old, set audience to Child, kids size mode to By age, and age in months to 36 to get 7-8.5 (Small).

If your foot length is in centimeters, cm to in calculator converts it to inches in one step before you read the US sock size band.

A few practical wins from converting shoe size to sock size before you buy.

• • Stop guessing between sizes: the calculator returns a US sock size band and a general size name that match the brand label on the multipack.
• • Size everyone in one pass: use the same chart for adults and children, so a single set of inputs covers the whole household.
• • Shop across brands and countries: convert a UK or EU shoe size to a US sock size before ordering from a foreign storefront or a new online shop.
• • Plan gifts and school shopping: a quick shoe size lookup is faster than measuring the recipient's foot when you only have the shoe they usually wear.
• • Outfit kids at any age: switch to age-based kids sizing when you do not have a recent shoe measurement, and read the matching size name (Toddler, Small, Medium) for the next multipack.
• • Match a band to the package label: the result lines up with the printed 9-11 small or 10-13 medium on the sock band, so the package you pick matches the size you need.

When you already have a foot length in inches, a quick measurement is enough to confirm which US sock size band to pick.

Both start from a single measurement you already have on hand, and feet and inches calculator handles the addition, subtraction, and conversion work for foot length in either unit.

Inputs and conditions that change which band the calculator returns.

• • Brand-specific sock charts vary by a half size, and compression socks, athletic socks, and dress socks can use single-size or extended-size labels that the general chart does not capture. Check the brand's sizing table if you are buying a specialty sock.
• • Kids grow at different rates. The age-based kids chart uses a typical foot length for the age, so children who are early or late bloomers may need a band above or below the calculator's recommendation.

If you have a recent foot length in inches, the bands are easier to confirm because US sock size is just foot length in inches rounded up to the next whole inch.

According to Wikipedia - Shoe size, US, UK, and EU shoe sizes follow different historical scales, and the US men's and women's scales are offset by about 1 size from UK and 30 to 33 sizes from EU that the calculator applies in the background.

Apparel sizing is a measurement-to-label problem at heart, and ring size converter follows the same pattern of turning a single body measurement into a US, UK, EU, or ISO ring size label.