Buying shoes online has made shopping much easier for me. I can compare different styles, check prices, read reviews, and order from home without spending hours visiting different stores. However, one thing that can make online shoe shopping difficult is choosing the correct size.
I have learned that buying the usual shoe size is not always enough. Different brands can have slightly different sizing systems, and even shoes from the same brand can feel different depending on their design. This is why I believe checking measurements and understanding the size guide is one of the most important steps before placing an online shoe order.
In this article, I will share the simple things I personally consider when choosing the right shoe size online.
Start by Measuring Your Feet
The first thing I recommend is measuring your feet before ordering. Even if you already know your usual shoe size, measuring your feet can give you a better idea of what size you actually need.
For this, I usually recommend placing a clean sheet of paper on a flat floor. Put your foot naturally on the paper while standing. Ask someone to mark the back of your heel and the end of your longest toe.
Measure the distance between these two points. This gives you the length of your foot.
It is better to measure both feet because they may not be exactly the same size. In my experience, many people have one foot that is slightly longer than the other. If this happens, use the measurement of the larger foot when choosing your shoe size.
Measure Your Feet at the Right Time
The time of day can also make a difference. Feet can become slightly larger after walking or standing for several hours. For this reason, I prefer measuring my feet later in the day.
If I measure my feet when they are completely rested in the morning, the measurement may be slightly different from how my feet feel after a busy day.
If you normally wear socks with the shoes you want to buy, wear similar socks while measuring your feet. This can help you get a more realistic idea of the space you need.
Check the Brand Size Chart
One of the biggest mistakes I see people make when shopping online is assuming that every brand uses exactly the same measurements.
A size 9 in one brand may feel slightly different from a size 9 in another brand. This does not necessarily mean that the brand is wrong. Shoe designs, materials, shapes, and sizing systems can all be different.
Before buying, I always recommend opening the size chart provided by the seller or brand. Look for measurements in centimeters or inches and compare them with your own foot measurement.
I personally prefer using the actual foot measurement instead of choosing a size only because it is the number I normally wear.
Understand Different Sizing Systems
Online stores may use different sizing systems depending on where the shoes are made or sold. You may see US, UK, and European sizes on the same website.
This can be confusing if you are not familiar with these systems.
For example, a person who normally wears a particular US size should not automatically assume that the same number will work in a European sizing system. Instead, I recommend checking the conversion chart provided by the seller.
When possible, I also look for the foot length in centimeters. I find this much easier because centimeters give me a direct measurement rather than asking me to guess between different sizing systems.
Think About the Type of Shoe
The style of the shoe also matters when choosing a size.
A running shoe, casual sneaker, formal shoe, boot, and sandal may not fit exactly the same way. Some shoes have a wider design, while others have a narrow shape.
For everyday sneakers, I usually want enough room around my toes so they do not feel squeezed. For formal shoes, I pay more attention to the overall shape and width because a tight fit can become uncomfortable after wearing them for a few hours.
Boots can also require extra consideration, especially if I plan to wear thicker socks.
This is why I never choose a size based only on the number. I also think about how I will use the shoe.
Leave Enough Room for Your Toes
One important thing I always consider is toe space. Your toes should not feel pressed against the front of the shoe.
When looking at product information online, check whether the shoe has a rounded, square, or narrow toe area. A shoe may have the correct length but still feel uncomfortable if its toe box is too narrow.
For sneakers and walking shoes, I generally prefer a comfortable amount of space around my toes. This gives my feet more freedom to move naturally.
At the same time, I would not choose a shoe that is much too large just to get extra toe space. The goal is to find a balanced fit where the heel stays secure and the toes have enough room.
Pay Attention to Shoe Width
Length is not the only measurement that matters. Width can make a huge difference in comfort.
Some people have narrow feet, while others have wider feet. If a shoe is too narrow, it can feel uncomfortable even when the length is correct.
When shopping online, I look for words such as wide, extra wide, narrow, regular, or standard. Some brands provide specific width measurements in their size charts.
Product descriptions and customer reviews can also give useful information about width. If several customers mention that the shoe feels narrow, I take that seriously before ordering.
Read Customer Reviews Carefully
Customer reviews are one of my favorite tools when shopping for shoes online.
I do not just look at the star rating. I read comments about sizing, comfort, width, and whether the shoes feel larger or smaller than expected.
For example, if many customers say that a particular shoe runs small, I consider that information before making a purchase.
I also pay attention to reviews from people who mention their usual size and the size they ordered. These details can give me a better understanding of how the shoe actually fits.
Photos uploaded by customers can sometimes be useful too, especially when they show how the shoe looks when worn.
Check the Return and Exchange Policy
Even after careful measuring, there is still a chance that the shoes will not fit perfectly. This is why I always check the return or exchange policy before ordering.
A good return policy gives me more confidence because I know what options are available if the size is wrong.
I look for information about the return period, exchange process, shipping charges, and whether the product must be unused.
I believe checking this information before buying is much better than discovering after delivery that the shoes cannot be returned.
Consider the Material
The material of a shoe can also affect how it feels.
Some materials are flexible and may become more comfortable after a short period of use. Other materials are less flexible and may keep their original shape.
Leather, fabric, mesh, synthetic materials, and other shoe materials can all feel different.
For me, comfort is more important than simply choosing a shoe that looks attractive in the product photos. If the material looks stiff, I pay extra attention to sizing and customer comments before ordering.

Do Not Trust Photos Alone
Online shoe photos can look excellent, but pictures cannot tell me everything about the fit.
A shoe can look wide in a photograph but feel narrow when worn. Similarly, a shoe can look perfect on a model but feel completely different on my own feet.
This is why I use photos mainly to understand the style, color, shape, and design. For sizing, I rely more on measurements, size charts, reviews, and product descriptions.
Compare Your Current Shoes
Another simple method I find useful is comparing the measurements of a shoe I already own.
If I have a pair that fits me comfortably, I can check its size, brand, and model information. I can then compare those details with the new shoe I want to buy.
However, I still do not assume that the exact same size will work automatically. I use my existing shoes only as a reference and then check the new brand’s size chart.
Think About How You Will Wear Them
Before ordering, I ask myself how I plan to use the shoes.
If I am buying walking shoes, I want comfort and enough room for movement. If I am buying shoes for an event, I may focus more on style while still making sure they are comfortable enough to wear.
For sports shoes, fit becomes even more important because movement can put additional pressure on the feet.
Knowing the purpose of the shoe helps me make a better sizing decision.
Take Your Time Before Ordering
One thing I have learned from online shopping is that rushing can lead to unnecessary mistakes.
When I find a pair of shoes I like, I try not to order immediately. I check the size chart, measure my feet, read reviews, check the material, and look at the return policy.
These steps only take a few minutes, but they can save me from the trouble of returning an unsuitable pair.
Final Thoughts
Choosing the right shoe size online does not have to be difficult. In my opinion, the key is to stop relying only on the shoe size you normally wear.
I recommend measuring both feet, checking the brand’s size chart, understanding the sizing system, considering shoe width, reading customer reviews, and checking the return policy. I also think about the type of shoe, the material, and how I plan to use it.
The most important lesson for me is that a good fit is about more than just a number. Comfort, foot length, width, toe space, and shoe design all matter.
When I take a few extra minutes to check these details before ordering, I feel much more confident about buying shoes online. A little preparation can make the difference between receiving a pair that stays in the box and receiving a pair that I actually enjoy wearing.

