Shoe size calculator: measuring your foot

What it does

Enter your foot length (and, if you have them, the ball width and the heel-to-ball length). The calculator gives your size in US (men's, women's or children's), UK and EU, the cm to look for on a brand's size chart, the Mondopoint (length/width in mm), and an estimate of your width letter.

Open it from Calculators → Data Tools → Shoe Size Calculator.

Measuring at home

1. Measure late in the day, wearing the socks you will wear in the shoe.
2. Stand on paper with your heel against a wall and your weight on the foot.
3. Trace around the foot with the pen upright.
4. Length: heel to the tip of the longest toe. Width: straight across the widest part, at the ball of the foot.
5. Measure both feet. The calculator sizes for the longer one.

Choose A pen tracing on paper: the pen line sits outside your foot, so 3 mm comes off the length and the width (you can change the amount).

The scales behind it

• US sizes use the Brannock scale shoe stores use: men's size = 3 × foot length in inches − 22. One size is ⅓ inch (8.5 mm).
• US women's is shown on the scale most running brands print (men's + 1.5). The Brannock device's own women's scale reads half a size lower; both are shown.
• Children's sizes run to 13½, then youth 1–7 on the men's scale.
• UK = US men's − 1. EU = 1.5 × foot length in cm + 2.
• Heel to ball: if your ball sits further forward than your toe length implies, the shoe is sized by it, so its flex point lands under your ball. A tracing makes this hard to mark: 6 mm is a whole size, and the calculator warns when it sizes you up a size or more.
• Width letters come from the Brannock width scale (men's D and women's B are standard). Women's letters are set two steps below men's at the same width, because women's lasts are built narrower. Treat the letter as a guide: brands differ.

Running, everyday, cycling

• Running / triathlon adds half a size of toe room for swelling on long runs and for downhills.
• Everyday gives the size your foot measures.
• Cycling shoes are sized in EU and fit snug: no extra room.

Brand charts

Brands disagree by up to a full size. Every brand chart lists a foot length in cm per size: pick the size whose cm is at least the one the calculator shows. Adidas uses EU sizes in thirds.