How to Tell if a Shoe Fits You Well: A Guide to Getting the Right Size When Shopping Online

Choosing the right size when buying shoes online is not simply a matter of selecting the number you usually wear. The shape of the design, the material, the width of the last and the type of footwear can all affect the fit. That is why it is advisable to take a few measurements and review the product information before placing your order. In this guide, you will find a practical method for knowing whether a shoe fits well, both before buying it and when you receive it at home.

Measure your feet before choosing your size

The most reliable way to start is to measure both feet at the end of the day, when they may be slightly more swollen. Place a sheet of paper on the floor, rest your heel against a wall and place your foot on top, distributing your weight naturally. Mark the point furthest from your toes and measure the distance between the edge of the paper and that mark.

Repeat the process with the other foot and use the measurement of the longer foot as your reference. Wear the socks or stockings you would normally wear with that type of footwear, as their thickness can affect the amount of space inside.

• Measure both feet: they are not always exactly the same length.
• Do it standing up, not sitting down, to obtain a more accurate measurement.
• Note the measurement in centimetres so you can compare it with the product’s size chart.

Check the model’s size guide

The conversion between centimetres and shoe size can vary depending on the brand, country of manufacture and last. Before choosing, look for the model-specific size guide and compare it with your foot measurement. If the product description provides information about the fit, material or width, take that into account as well.

Do not assume that you will always need the same size in ballet flats, lace-up shoes, sandals or boots. The design and shape of the footwear can affect how roomy and secure it feels.

• Give priority to the specific size chart over general conversions.
• Check whether the measurements refer to foot length or the shoe’s inner length.
• If you are between two sizes, review the type of footwear and the fastening system before deciding.

Check the length: your toes need room

A well-fitting shoe should not press against your toes or make them hit the toe box when you walk. When trying it on, there should be a small amount of room in front of your toes, without your foot sliding forwards. With closed styles, walk for a few minutes and pay attention to the toe area, especially if the design is narrow or has a pronounced shape.

It is also best not to compensate for insufficient length by relying on the footwear to stretch. Some materials may adapt slightly with wear, but a short shoe will remain uncomfortable.

• Your toes should be able to move without being compressed.
• Your longest toe should not touch the toe box when you walk.
• Check the fit on both feet, starting with the larger one.

Check the width, heel and support

Size does not only determine length. A shoe can be long and still be too narrow or too loose. Check whether the instep is being squeezed, whether the foot protrudes over the sides of a sandal, or whether the heel lifts excessively when walking.

Laces, Velcro, buckles and other fastening systems allow you to adjust the footwear more precisely. By contrast, slip-on models should provide balanced support: they should not be tight enough to prevent the foot from slipping out, nor so loose that they make you curl your toes as you walk.

• The heel should remain reasonably secure without rubbing.
• The instep should not be compressed by the upper or fastening.
• In sandals, the foot should remain within the sole without protruding at the front or sides.
• Consider models with laces or Velcro if you need to adjust the support more precisely.

Try the footwear on at home realistically

When you receive your order, try on both shoes on a clean surface and for long enough to walk, sit down and go up or down a few steps. Do so with your usual socks or tights and, if you use insoles, check that they fit correctly only in compatible models.

Look out for signs of an unsuitable fit: localised pressure, irritating creases, constant slipping, immediate rubbing or a feeling of instability. A slight difference in sensation between one foot and the other may be normal, but the footwear should feel comfortable and secure on both.

• Always try on both shoes, not just one.
• Walk in them before deciding whether the size is right.
• Keep the box and follow the exchange or return conditions indicated by the store.
• If you need insoles, check that the design is compatible and does not reduce the interior space too much.

Common mistakes when buying footwear online

One of the most common mistakes is choosing a size solely out of habit. It is also common to measure your foot in the morning, ignore the width, assume that all materials stretch equally or buy a larger size for added comfort without checking whether the heel is loose.

The best decision combines your foot measurements, the information in the product listing and a careful trial at home. If the model does not suit the shape of your foot, changing the design may be more effective than changing the size.

• Do not choose a size based solely on the one you wear in another brand.
• Do not confuse a wider fit with an excessively long size.
• Do not wear new shoes for many hours until you have checked their fit.
• Do not ignore the retailer’s care, exchange, and return instructions.

Conclusion

To get the right size when buying shoes online, measure both feet, consult the guide specific to the model, and check the length, width, heel, and support. The correct size is the one that allows you to walk comfortably, without unnecessary pressure or slipping. If the design does not fit the shape of your foot well, consider another type of footwear or a more adjustable fastening system instead of automatically choosing a different size.