How to measure foot size correctly (step-by-step guide)
It is essential to know how to correctly measure your children's foot size to ensure they have comfortable shoes that fit perfectly. A common mistake is to measure the foot by placing a finger behind the heel to check if there is extra space. This technique is not accurate and can lead to incorrect foot positioning, such as clawing the toes.
Materials needed for measuring at home
To do this, you don't need anything unusual:
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Paper
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Ballpoint pen
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Tape measure
Length measurement: draw the outline and add 1 cm
This is the safest method to avoid falling into the typical trap of "I think it fits." The key is to measure the foot as it is, without pushing it into the shoe or using the trick of placing your finger behind the heel (which can distort the measurement).
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Place your foot on the paper, ideally standing with your weight evenly distributed.
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Draw the outline of the foot, marking the contour clearly.
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Mark the rearmost point of the heel and the tip of the longest toe (not always the big toe).
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Measure the distance between these two points in centimeters: that is the length of the foot.
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Add 1 cm to that measurement to obtain the "target" length with a margin.
Example: if the foot measures 18.0 cm, the reference with margin would be 19.0 cm.
Width measurement: confirms actual space in the forefoot (not just "fits")
When it comes to comfortable footwear, width is just as important as length: you can get the length right and still end up with a shoe that fits poorly if it compresses the forefoot.
How to measure it easily:
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With your foot resting on the paper, mark the outermost points of the widest area (metatarsals).
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Measure that distance in centimeters.
How to interpret this when choosing footwear:
- If you usually have "plenty of length but just enough width," you need a Fit or a more anatomical toe box.
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The correct fit is noticeable because the forefoot is supported, but without lateral pressure or "cramped" toes.
Why correct measurement is essential in respectful footwear
Because in comfortable footwear, the correct size is one that allows free movement inside the shoe: the foot should not be "restricted," but rather comfortable and with room to move naturally throughout the day. If the measurement is incorrect, the size may seem right, but the shoe limits that freedom and the foot begins to feel tight without you realizing it.
Difference between size and actual space for fingers
The size is a guideline, but what really makes the difference is the usable interior space. Two shoes of the same size can vary greatly depending on the shape of the toe, the width of the Fit the volume of the instep. That's why measuring properly prevents you from sticking with "my usual size."
Importance of Fit and wide box
Fit respects the actual shape of the foot and allows the toes to be positioned naturally. That wide "box" at the front is not an extra feature: it is what allows the foot to move freely. In comfortable footwear, the idea is simple: the shoe accompanies the foot, rather than forcing the foot to adapt to the shape of the shoe.
Recommended growth margin in adults and children
The margin is not "a little extra space": it is what prevents the foot from rubbing when it moves. Throughout the day, the foot changes (it activates, expands, and may swell) and, in children, it also grows. Without that margin, a shoe may seem right when trying it on, but fall short in actual use and start to rub or feel tight.
- Children: as a practical reference, add 1 cm to the foot measurement for comfort and to ensure they will not become too small too quickly.
- Adults: as a practical reference, add 1 cm to the foot measurement for comfort.
Common mistakes when measuring feet (and how to avoid them)
Measure while sitting instead of standing
When seated, the foot does not behave in the same way. For a more accurate measurement, measure with your foot flat on the floor and your body weight distributed evenly.
Do not measure both feet
It is normal for one foot to be slightly longer or wider than the other. Measure both feet and choose based on the larger foot.
Not taking into account the time of day
Your feet can change throughout the day. If possible, measure them in the evening or after being active for a while.
Be guided solely by your usual size
Comfortable footwear is influenced by the Fit, width, and shape of the toe box. That's why it's more reliable to decide based on centimeters than on habit.
How to interpret a size guide correctly
Conversion between centimeters and European sizes
Whenever possible, prioritize guides that indicate cm (recommended foot size or inner measurement). If only EU sizes are available, use them as a reference, but rely on cm to get it right.
Differences between brands and lasts
The same EU size may feel different depending on:
- actual width of the forefoot
- toe shape
- instep volume
That's why not all brands "fit the same," even if the size is the same.
What to do if you are between sizes
If you're torn between two options, decide based on this idea: the foot should have free movement without losing support.
- If you notice that you tend to swell up or go on long walks, it is usually more comfortable to go uphill.
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If there is too much length and the heel is not stable, the smaller size may be more suitable.
And always: zero lateral pressure and a feeling of freedom inside the shoe.
How to measure children's feet step by step
Recommended measurement frequency according to age
With little ones, there is no "linear" growth that can be calculated by eye: sometimes weeks go by without any change, and other times they have a growth spurt. Therefore, as a practical guide, check the measurement every two weeks. And always keep in mind: every foot and every child is different.
Adequate growth margin
As a rule of thumb, adding 1 cm to the foot measurement usually works well to ensure a comfortable fit with some extra room.
Signs that your shoes are too small
- Red marks on fingers or sides.
- He takes them off, complains, or avoids walking with them.
- Bruised nails or deformed toe
- New stumbles or walking strangely with those shoes
Measurement in wide feet or with high instep
How to determine if you need Fit shoes
Typical signs:
- good length, but pressure on the forefoot
- marks on the sides when removing the shoe
- feeling of "tightness" in the metatarsals
- the toe deforms outward
Correct adjustment without lateral compression
A proper fit feels like this:
- stable heel (no dancing)
- comfortable upper (without cutting)
- forefoot with freedom (without lateral pressure)
- overall feeling of free movement
Frequently asked questions about how to measure foot size
How often should I measure my foot?
- Adults: when you change brands/models or notice changes (increased activity, discomfort, etc.).
- Children: depending on age (above) and always if there is rubbing or complaints.
Is it reliable to measure yourself only with a mobile app?
It can serve as a guide, but to refine size and Fit, the paper method in centimeters is usually more consistent.
Does the size change over the years?
It can change: feet can widen or vary depending on habits, activity, pregnancy, or injuries. That's why it helps to measure them in centimeters from time to time.
Does the type of sock influence the measurement?
Yes. If you are going to wear thick socks, measure yourself with those socks on or take them into account when choosing the margin. If you are going to wear sandals or go without socks, measure without them.
Instagram video
We leave here the video to make the measuring process easier for you.
Put what you've learned to the test
Answer the questions to see how much you know about this topic.
1. What measurement should you use to choose your size if one foot is slightly longer than the other?
2. What is the key step in the method we are using to calculate the length “with a margin”?
3. Why is it important to measure width as well when it comes to adaptive footwear?
4. As a general guideline, how often should a child’s height be checked?
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