# Sock Size Calculator

URL: https://speedycalculator.com/calculators/everyday-life/sock-size/
Last updated: 2026-10-25

> The sock size calculator finds your sock size and S/M/L size from your shoe size or foot length for men, women and children.

## Inputs

- Sizing
- I know
- US shoe size
- Foot length (cm, in, mm, m)

## Results

- Foot length (in)
- US sock size
- General size
- Foot length (cm)

## Formula

```
Sock size ≈ foot length in inches, rounded up
Foot length from US shoe size: men (size + 22) ÷ 3, women (size + 21) ÷ 3
```

## Explanation

US sock sizes are based on foot length in inches, so a sock size 11 fits a foot about 10–11 in long. Packs are often sold as S, M, L or as a range of shoe sizes. Stretchy socks cover a range of about two sock sizes.

### How to use the Sock Size Calculator

- **Sizing**
- **I know**
- **US shoe size**
- **Foot length**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Choose men's, women's or children's sizing and enter your US shoe size, or choose to enter foot length.

### Tips

- Measure over thin clothing with a soft tape held snug but not tight, and keep the tape level all the way round.
- Take each measurement twice; if you are between sizes, the larger size is usually the safer choice.
- Size charts vary by brand and country – check the maker's own chart when it is available.
- For sewing projects, pre-wash fabric before cutting and buy 10% extra for shrinkage, pattern matching and mistakes.

### Common mistakes to avoid

- Mixing inches and centimetres between the tape and the size chart.
- Forgetting seam and hem allowances when cutting fabric.
- Measuring an old, stretched garment instead of your body.

### Inputs explained

FieldWhat to enterSizingChoose one: Men's, Women'sI knowChoose one: US shoe size, Foot lengthUS shoe sizeA numberFoot lengthUnits: cm, in, mm, m

### What each result means

- **US sock size** = ceil([Foot length (in)] - 0.000001)
- **Foot length (cm)** = [Foot length (in)]×2.54

### Example values

How the main result changes when **US shoe size** changes and everything else stays at the example values above:

US shoe sizeUS sock size597.510101112.51215132014

## Worked example

Inputs — Sizing: Men's; I know: US shoe size; US shoe size: 10; Foot length: 26.67 cm.

Results — Foot length (in) = 10.67; **US sock size = 11**; General size = M; Foot length (cm) = 27.1.

## FAQ

**What sock size for a size 10 shoe?**
Men's US 10 shoe ≈ sock size 11 (medium–large).

**Is sock size the same as shoe size?**
No – sock sizes are usually 1–2 numbers higher than US men's shoe sizes.

**What does "sock size 10–13" mean?**
The sock fits feet about 10–13 in long, roughly men's shoe sizes 8–12.

**What formula does the Sock Size Calculator use?**
Sock size ≈ foot length in inches, rounded up.