How to convert shoe sizes between countries and avoid exchanges

Buying shoes online is inherently risky; when numbers from other countries are involved, the risk of error appears to double. The same foot can be 37 in Brazil, 38 in Europe, 6.5 in the USA and 4.5 in the United Kingdom, depending on the brand and model. If the conversion is done “by eye”, it is very likely that the result will be a sneaker that is tight in the front, a sandal that is too wide or that boot that hurts the heel on the first use.

In this guide, you will understand how the main shoe numbering systems work, learn how to measure your foot correctly at home and see how SizesGrid can help you translate between BR, EU, US, UK and other systems, greatly reducing the chance of error when shopping online.

Why shoe sizes are so confusing

Just like with clothes, there is no single shoe numbering standard in the world. Various systems have emerged over time, with different measurement logics and “steps” between one number and another.

In summary:
- In Brazil, shoe numbering tends to follow a system close to the European one, but shifted a few points (for example, EU 38 ≈ BR 36 in some manufacturers).
- In continental Europe, most brands use the EU system, based on Paris points, with fixed length increments between sizes.
- In the United States, there are separate systems for men, women and children, and the “jumps” between numbers may be different from those in Europe.
- In the UK, the size scale starts at different values ​​and also has variations for adults and children.

Furthermore, each manufacturer adjusts the last according to the target audience and the type of footwear.

Understanding the most common equivalences (BR, EU, US, UK)

Although each brand has its own table, some approximate standards are often cited for women's shoes:

- BR 34 ≈ EU 36 ≈ US 5–5.5 ≈ UK 3
- BR 35 ≈ EU 37 ≈ US 6 ≈ UK 4
- BR 36 ≈ EU 38 ≈ US 7 ≈ UK 5
- BR 37 ≈ EU 39 ≈ US 7.5–8 ≈ UK 5.5–6
- BR 38 ≈ EU 40 ≈ US 8.5–9 ≈ UK 6.5–7

For men's shoes, the logic is similar, but with a different basis of equivalence; for example, an EU 42 usually corresponds to a male US 9 and a BR around 40–41, depending on the manufacturer.

The best practice is to always combine the conversion table, foot length in centimeters and brand information.

How to measure foot length at home

Knowing your foot length in centimeters helps eliminate doubts when you are between two numbers and makes the conversion more accurate.

Step by step to measure your foot:
1. Place a sheet of paper on the floor, against a straight wall.
2. Stand on the paper, with your heel against the wall and your weight distributed equally on both feet.
3. Mark the tip of your longest finger on the paper (not always your big finger).
4. Measure, with a ruler or tape measure, the distance between the wall and the finger mark; write down the value in centimeters.
5. Repeat the process on the other foot and consider the highest value.

Some brands suggest measuring at the end of the day, when feet tend to be a little wider.

When it makes sense to use SizesGrid for shoe conversion

SizesGrid is useful in two main scenarios:
1. When the store's website has the numbering in a single system (e.g. EU) and you want to know what the equivalent would be in BR, US or UK.
2. When you have your foot length in cm and want to see how it translates to the different numbering systems in the world.

Instead of opening several tables spread across the internet, SizesGrid centralizes this logic in a single interface.

How to use SizesGrid to convert shoe sizes

1. Access the “Fashion” category and choose the footwear converter (Women’s, Men’s or Children’s).
2. Choose the type of entry: the size you already use today (BR 37) or the length of your foot in centimeters.
3. Select the target systems to see the table with the most likely matches.
4. Analyze the results taking into account the type of footwear (open or closed, rigid or soft material).

Practical conversion examples with SizesGrid

Example 1: Women’s sneakers – Brazil → Europe and USA
If you wear BR 36 and measure your foot at 24.0–24.5 cm. On SizesGrid, you might see something like: BR 36 ≈ EU 38 ≈ US 7 ≈ UK 5. If it's a structured running shoe, testing EU 38 or 38.5 makes sense.

Example 2: Men's sandals – Brazil → USA
A man who wears BR 41 and has a foot measuring 27 cm will see similar equivalences on SizesGrid: BR 41 ≈ EU 43 ≈ US 10 ≈ UK 9. In an adjustable sandal, there is a margin, but in a closed model, it is worth paying attention.

Tips to reduce the chance of error when buying shoes online

- Read the brand’s “fit notes” (“fits small”, “true to size”).
- Consider the width of your foot.
- See customer reviews.
- Test your new shoes at the end of the day.
- Respect the exchange period.

Common mistakes when converting shoe sizes

- Assume that the same number applies to any brand and model.
- Ignore the length in cm.
- Confusing male and female systems (a male US 8 is not equivalent to a female US 8).
- Do not take into account the intended use.

FAQ – shoe numbering between countries

1. Is there a 100% accurate converter for any shoe? No. Converters provide approximate values.
2. If the converter indicates two possible sizes, which one should I choose? For closed models, prefer the larger one; for sandals, sometimes smaller is better.
3. Do children follow the same equivalences? The bases are similar, but there are more variations. Use size in cm and children's tables.
4. Do I need to measure my foot every time? No, but from time to time it's good, or if you change brands.
5. What if the shoe is a little loose or tight? If it's painful, change it. Uncomfortable shoes cause long-term problems.

Next steps: using SizesGrid as an ally

Measure your foot length in cm, use the SizesGrid converter to see international equivalences and compare with the store table. Save the combinations that worked well so that each new purchase is predictable and stress-free.