How to Measure Your Foot Properly
Ask five people their shoe size and at least three will give the wrong answer — not because they misread a chart, but because they were measured once, years ago, in a shop, while standing in a way that flattened their arch.
Measuring properly takes four minutes and fixes most fit problems before they happen.
What you need
- A sheet of paper larger than your foot
- A pencil
- A ruler
- A wall or hard surface to stand against
- Socks of the thickness you will actually wear
The four-step method
Step 1 — Measure in the afternoon. Feet swell through the day. Measuring in the morning gives you a size that will feel tight by evening.
Step 2 — Stand, do not sit. Stand with your full weight on the foot being measured, heel against the wall. Sitting puts less load through the arch and produces a shorter measurement — typically 3–5 mm shorter, which is enough to change a half size.
Step 3 — Trace. Place the paper under your foot, heel touching the wall. Keep the pencil vertical and trace the outline. Do not press the pencil inward; the line should sit exactly at the edge of your foot.
Step 4 — Measure both dimensions.
- Length: from the back edge of the heel to the tip of the longest toe. Measure both feet and use the longer one.
- Width: across the widest part, usually just behind the ball of the foot.
Why both feet
Almost nobody has two identical feet. A difference of 3–5 mm is normal; 8 mm is not unusual. Always fit to the larger foot — it is far easier to accommodate a slightly loose shoe than a tight one.
Converting to a size
Length in centimetres maps roughly to EU size:
| Foot length | EU | UK | US (men) | |---|---|---|---| | 24.5 cm | 39 | 6 | 7 | | 25.5 cm | 41 | 7 | 8 | | 26.5 cm | 42 | 8 | 9 | | 27.5 cm | 43 | 9 | 10 | | 28.5 cm | 44 | 10 | 11 | | 29.5 cm | 45 | 11 | 12 |
Two caveats that matter more than the table:
- Brands differ. A Nike 42 and a Salomon 42 are not the same length. Always check the brand's own size guide if it publishes one.
- Last shape matters more than length. A narrow last in your size may still pinch; a wide last may need a half size down.
Fit, not size
Once you have the number, judge the fit by feel:
- Toe box: a thumb's width (about 10 mm) between your longest toe and the end of the shoe.
- Heel: should hold without slipping more than a few millimetres when you walk.
- Width: the upper should feel snug across the ball of the foot but not compress it. If you can see the material bulging at the sides, it is too narrow.
- Instep: no pressure across the top of the foot when laced normally.
Common mistakes
- Measuring while seated — under-reports length.
- Measuring in thin socks then wearing thick ones — accounts for a half size.
- Trusting a shoe's printed size over the actual fit — sizing labels drift between production runs.
- Buying for the smaller foot — guarantees one shoe that hurts.
A note on sneakers specifically
Sneakers break in differently from leather shoes. Knit uppers stretch; leather uppers mould; moulded soles do not change at all. If a sneaker feels slightly tight across the instep, it will likely relax. If it feels short in the toe, it never will.
When comparing models, it helps to view pairs from the same family side by side — Nike, Air Jordan and New Balance each have fairly consistent last shapes within their own ranges, which makes sizing between them more predictable than sizing across brands.