Buying shoes online is easier when you know the measurements behind your usual size. A UK 7 in one brand may feel different from a UK 7 in another, and old trainers do not reveal whether your feet need more width or toe space. Learning how to measure feet for shoes gives you a reliable starting point when trying an unfamiliar brand.
You only need paper, a pencil and a ruler. Measure both feet, record the results in millimetres and compare them with the chart for the specific shoes you want.
What you need before measuring
Find two pieces of paper large enough for your feet, a pencil, a ruler or tape measure and a hard, level floor beside a straight wall. Avoid thick carpet, which can distort your outline. Secure slippery paper without creating a raised edge.
Measure towards the end of the day, when feet may be slightly larger after walking. Wear the socks you expect to use with the shoes, such as thicker socks for walking boots. Stand naturally rather than sitting; weight on the foot can change its shape.
How to measure foot length accurately
Position your heel against a wall
Put paper on the floor with one edge flush against the wall. Place your heel lightly against the wall, stand upright and distribute your weight evenly. Keep your toes relaxed. Ask someone to help if bending down makes you shift your weight.
Mark your longest toe
Hold the pencil upright and mark the tip of your longest toe. That might be your second toe, not your big toe. Step off the paper and measure from the wall-side edge to the mark using the millimetre scale. This is your heel-to-toe foot length.
Repeat and check
Measure again before moving to the other foot. If the results differ by several millimetres, check your heel position and pencil angle. Repeat the method on your other foot. Many people have one foot longer than the other, so keep both results rather than averaging them.
How to measure foot width at home
Length tells only part of the story. To measure foot width, stand on fresh paper and mark the outermost points across the ball of your foot, just behind the toes. Measure the straight-line distance between the marks in millimetres. Keep your toes relaxed.
Be careful with width figures. Flat width is not the same as a circumference measurement around the ball of the foot. Some UK fitting systems, including children’s fittings, use circumference to assign width. Follow the retailer’s instructions; never enter one measurement type into a field asking for the other.
When a tape measurement is required, wrap it gently around the widest part of the ball while standing. Keep it snug without squeezing. Note whether your result is flat width or girth so you can compare it correctly.
Turn your measurements into a useful size record
Record the date, left and right lengths, widths, units and socks worn. For example, your left foot might measure 258 mm long and your right 262 mm. Use 262 mm as the starting point for selecting length, while retaining separate width readings. That four-millimetre difference could matter near a size-chart boundary.
Keep the record on your phone. A repeatable foot measurement guide helps you track genuine changes instead of guessing based on how worn shoes feel.
How to use your results with UK shoe size charts
Find the manufacturer’s chart for the exact footwear range. Check whether its centimetre or millimetre column describes foot length, insole length or shoe length. These are different. If the chart gives foot length, compare your heel-to-toe result directly; do not automatically add extra millimetres. Its recommended size should account for the intended fit.
Suppose your longer foot is 26.2 cm. Find that measurement on the relevant chart, then read its UK size and guidance for measurements between entries. Do not rely on a generic UK-to-EU conversion alone: sizing and shoe shapes vary between brands.
A UK shoe size conversion guide helps when a shop displays EU or US labels. A wide fit shoes guide is useful if length looks right but the forefoot feels cramped. Both are better starting points than automatically ordering a full size larger.
Check the fit when the shoes arrive
Measurements narrow down options but cannot guarantee comfort. Try shoes indoors with your usual socks and stand up before judging them. Your toes should move freely, the broadest part of your foot should sit comfortably inside, and your heel should feel secure without painful rubbing.
As a general check, NHS guidance suggests approximately 1 cm of space beyond the longest toe in a suitable shoe. That is room inside the fitted shoe, not an amount to add to every foot-length chart. Toe-box shape and intended use still matter. Walk around and check for pressure at the sides or above your toes.
If a larger size relieves side pressure but makes your heel slip, seek a different width or shape. A shoe that pinches immediately is unlikely to become the right shape through wear. A shoes that fit properly guide can help with final try-on checks.
Common measurement mistakes to avoid
Measuring while seated, tipping the pencil under the toes or using carpet can make readings unreliable. So can tracing bulky socks and treating a thick pencil line as an exact boundary. Use a fine mark and measure twice.
Identical lengths do not guarantee identical fit across footwear types. Trainers, pointed shoes, sandals and walking boots distribute space differently. If you wear orthotic insoles, check their depth in the actual shoes rather than relying on length alone.
Frequently asked questions
Can I measure my feet without a measuring device?
Yes. Paper, a wall, a pencil and a ruler are enough to measure foot size at home. A trained fitter can help when results are inconsistent or finding comfortable shoes is difficult.
Should I use centimetres or millimetres?
Record millimetres for precision, then divide by ten if a chart uses centimetres. For example, 262 mm equals 26.2 cm. Check the units before entering your measurement.
What if one foot is bigger than the other?
This is common. Start with the longer foot for shoe length and assess both feet when trying shoes. Lacing adjustments may help a slightly looser shoe but should not compensate for painful tightness.
How often should I remeasure?
Adults can recheck when replacing shoes or noticing a fit change. Children’s feet grow faster, so check regularly and whenever shoes feel tight. Professional fitting is especially useful for growing feet.
A few minutes that make shoe shopping easier
Measure each foot on a hard floor, record length and width separately, and compare the larger measurements with the correct brand chart. Then let the try-on confirm your choice. Knowing your shoe size at home is useful; understanding why a particular pair fits is even better.