How to Find Your Shoe Size at Home: A Step-by-Step Guide

by YDA UK

You can find your shoe size at home with a sheet of paper, a pen, a ruler and about ten minutes. Stand on the paper, mark your heel and your longest toe, measure the gap in millimetres, and repeat for both feet. Then match the larger measurement to the brand’s own size chart. The method is simple. Most wrong sizes come from small slips in how you do it.

This guide walks through the whole process and explains why timing and socks matter. It also covers how to turn a measurement into a UK, EU or US size, and when a ruler is not enough.

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TL;DR

  • Measure in the late afternoon or evening, when your feet are at their largest, and measure both feet.
  • Stand on paper, mark the heel and the tip of the longest toe, and measure that distance in millimetres.
  • Size to your larger foot, then check the brand’s own chart. Sizes differ between makers, but millimetres do not.
  • Phone apps vary a lot in accuracy. For supportive or medical footwear, a ruler is only a starting point.
  • If you have diabetes, or foot pain or deformity, ask a podiatrist or your diabetes foot protection team before you choose shoes.

Table of Contents

What you need

You probably have everything in the house already:

  • Two sheets of plain paper (A4 is fine)
  • A pen or sharp pencil
  • A ruler or tape measure with millimetres
  • A hard, flat floor and a wall to stand against
  • The socks you plan to wear with the shoes
  • A second person, if you can get one, to mark the paper while you stand

A hard floor matters. On carpet the paper shifts and your weight spreads differently, which can throw the reading out by a few millimetres.

When to measure

Feet swell through the day. Guidance from Gloucestershire podiatry says to measure late in the day, when your feet are largest, and to measure both feet, because most people have one slightly bigger than the other. Always size to the larger foot.

If you measure first thing in the morning, you may buy shoes that feel fine in the kitchen and pinch by teatime. Do it after work or after a walk instead.

Wear the socks you will actually wear. A thick walking sock and a thin trainer sock can change how a shoe feels, so use the pair that matches your plan.

Step by step: measuring your foot length

  1. Tape the paper down. Put a sheet on the hard floor with one edge flat against a wall.
  2. Stand on it. Place one foot on the paper with your heel touching the wall. Keep your weight evenly spread, standing upright, not sitting. Your foot lengthens and widens a little under body weight.
  3. Mark the longest toe. Hold the pen upright, not angled in under your toes, and mark the tip of your longest toe. This is not always the big toe. Many people have a longer second toe.
  4. Step off and measure. Draw a straight line from the wall edge to your mark, or measure the distance between the heel edge and the mark directly. Write it down in millimetres.
  5. Repeat with the other foot. Use a fresh sheet.
  6. Measure twice. If the two readings for the same foot differ by more than 2 or 3 mm, do it again.

A second method is to trace around your foot. Keep the pen vertical and close to the foot, then measure from the back of the heel to the tip of the longest toe on the outline. Tracing is slower and less precise, but it also shows you the shape of your foot, which helps with the width step below.

Measuring width

Length is only half the story. Width decides whether a shoe feels roomy or cramped across the ball of the foot.

  • Mark the two widest points on your tracing, usually the joints at the base of the big toe and little toe.
  • Measure straight across between those marks.
  • Or wrap a soft tape measure loosely around the ball of the foot for a circumference. Do not pull it tight.

Some brands list widths as letters or fittings, others as circumference in millimetres. Compare your number with the chart for the pair you want, and keep in mind that a foot with a high instep or a bunion needs more room than the width figure alone suggests.

Turning millimetres into a shoe size

This is the step that trips people up. UK, EU and US sizes are not the same scale, and brands interpret them differently. The most reliable number is your foot length in millimetres.

There is a system built on exactly that idea. The Mondopoint system, set out in ISO 9407, describes size by the foot length the shoe is intended to fit, so a size 260 suits a 260 mm foot. The standard’s aim is to reduce confusion for people buying across countries. A BSI summary of the standard notes that some makers write size in centimetres instead of millimetres, such as 26 in place of 260, which is one more reason to read charts carefully. The later ISO 19407:2023 provides conversion tables between Mondopoint, European, UK, and the Chinese, Japanese, Korean and US systems, according to its abstract.

Add room for your toes

Your foot length is not the same as the inside length of the shoe. You need space in front of the longest toe so your foot can move as you walk. A guide on choosing shoes for diabetic feet suggests about half to three quarters of an inch (1.27 to 1.9 cm) of clearance at the longest toe. Brand charts normally build some allowance into the size already, so use the chart first and then check with the thumb test when the shoes arrive: press down at the front and you should feel roughly a thumb’s width of room.

A worked example

Say your right foot measures 268 mm and your left 264 mm at 5 pm, in your usual socks.

  1. Use 268 mm, the larger foot.
  2. Open the size chart of the exact brand and style you want.
  3. Find the row whose foot length range includes 268 mm.
  4. If you fall between two rows, choose the larger one, especially for lace-ups you may want to wear with thicker socks.
  5. If the brand has no foot length column, look for a conversion instead. Our own guides cover UK, EU and US conversions for men and a measure-first conversion chart for women.

Converting between UK, EU and US sizes

If you shop from abroad, or a pair is listed in another system, these guides on our site will help you move between them:

A conversion gives you a starting point. It cannot account for last shape, which is the mould a shoe is built around. Two pairs both labelled UK 8 can fit differently. That is why the millimetre figure and the maker’s own chart come first.

Can you measure your shoe size with a phone?

Yes, but with care. Several apps use the camera, often with an A4 sheet as a scale reference. Research shows their quality is uneven. A scoping review of mobile apps for foot measurement found that all the apps assessed failed to meet even half of the measurement criteria needed for custom-made footwear, and only 6 of 26 reportedly used external scanners or advanced algorithms.

There are better results in research settings. A study of the OptiFit application reported accuracies of 95.23% for length and 96.54% for width, though lower for arch height at 89.14%. The authors point out that simple 2D measurements miss things such as instep girth and arch height.

OptiFit accuracy across three foot measures

In practice: an app is a handy second opinion for an everyday shoe. Do not rely on one alone for supportive footwear.

Common mistakes to avoid

  • Measuring one foot only. The two feet are rarely identical.
  • Measuring sitting down. Your foot spreads when it takes your weight.
  • Angling the pen. A tilted pen under the toe adds several millimetres.
  • Trusting your old size. Feet change with age, pregnancy, weight changes and injury, so remeasure every year or so.
  • Ignoring the brand chart. A size is a label. A foot length in millimetres is a fact.
  • Buying for the shortest foot. Pressure on the longer foot leads to rubbing and sore toes.

The cost of getting it wrong is more than annoyance. West Northamptonshire Council’s foot care advice says poorly fitting shoes can cause problems such as corns, calluses, bunions and ingrown toenails. nidirect also recommends choosing the right shoes to help prevent corns and calluses.

If you have diabetes or a foot condition

A ruler measurement is not enough if you have diabetes, reduced feeling in your feet, deformity, swelling or a history of ulcers. In these cases, ask your GP, podiatrist or local diabetes foot protection service to check your feet and advise on footwear. Foot pain is not something to put up with, and new redness, swelling, blisters or bruising need to be looked at promptly.

When you do shop, the local-authority guidance points to a consistent set of features. West Northamptonshire Council advises a roomy toe box, a heel no higher than 3 cm (1.5 inches) and breathable materials. Gloucestershire’s podiatry guidance adds fastenings such as laces, straps or Velcro to hold the foot firmly, and lightweight, shock-absorbing soles.

Check inside the shoe, too. Run your hand along the lining for seams or rough patches that could rub, and try shoes on in the afternoon with the socks you will wear.

Hand checking shoe lining for rough seams

Our perspective: size is the start, not the finish

At Ydauk we sell footwear designed around foot health, comfort and energy efficiency, and our YDA Technology is built to stabilise and assist each step. That makes sizing a daily conversation for us.

We see the same pattern again and again. People measure carefully, find a number, and then discover that the number is only half the answer. Length tells you whether your toes have room. It says little about how the shoe holds your heel, how it supports your arch or how it behaves across a full day. For everyday wear, we would rather you spend ten minutes measuring properly than return a pair that nearly fitted.

Our advice is to treat the measurement as a fact about your foot and the size label as a convention that changes from maker to maker. Write your millimetre figures down and keep them somewhere you can find them. When you shop, read the chart for that exact pair, and if you land between sizes, go for the one that lets your toes lie flat without sliding.

If your feet are problem feet, whether through diabetes, bunions or long-standing pain, please bring a professional into the decision. We would rather you were comfortable and well advised than pleased with a quick purchase.

— Panagiotis

Choosing your pair at Ydauk

Once you have your length and width, you are ready to browse. Our high performance footwear is made for people who want style and comfort alongside foot health technology, including those with sensitive or problem feet. Keep your measurements to hand, check them against the size information on the product page, and if you are unsure, our how-to guides, such as how to measure foot size for shoes at home and the 2026 home guide, go through the process again in more detail.

FAQ

How do I figure out my shoe size?

Measure the length of both feet in millimetres, standing, in the late afternoon. Take the larger figure and find it on the size chart for the exact brand and style. If you fall between two sizes, choose the larger.

Can I measure my shoe size with my phone?

You can, but accuracy varies a great deal between apps. A review of foot measurement apps found that none met even half of the criteria for custom-made footwear. Use an app as a cross-check against a ruler measurement, not as your only source.

How do I check my UK foot size?

Measure your foot length in millimetres, then look it up on the UK column of the maker’s chart. UK sizes are not tied to a single universal scale, so charts differ slightly between brands. The Mondopoint system, which uses millimetres directly, avoids that ambiguity where a brand lists it.

Should I measure both feet?

Yes. Most people have one foot slightly larger than the other, and Gloucestershire podiatry guidance says to size to the larger one. Shoes that fit the bigger foot can be adjusted with laces or a thin insole for the smaller one, but shoes that are too tight cannot be stretched to fit comfortably.

Sources

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