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Converting Asian Size to US Size for E-commerce businesses

Sam|
March 12, 2025|
10 min read

Running a successful online clothing venture is not just about stocking your inventory, listing your products, then waiting for an order. The minor details, such as understanding and storing different styles and sizes – especially sizes – will greatly influence your company. When consumers receive the wrong size products, they will expect refunds, returns, and customer policy. There are many significant challenges as e-commerce companies offer clothes in one area like Asia to consumers familiar with apparel styles in another. When you run a retail store as an eCommerce company, you must learn how to convert Asian sizes into U.S. sizes.

This article will go through the idea of size conversion, learn how Asian sizes differ from the US sizes, and how you can manually convert Asian sizes to the US sizes to meet your customers’ expectations.

About Asian Size to US Size conversion

Sizing is the first important element in clothing ventures – and as an e-commerce store owner, you should understand the significance of size conversion and the advantages it brings to your business. The challenge is that there’s no official sizing system, and manufacturers usually make clothes based on local and regional sizing. This is where problems blow in.

For example, Asian sizes are usually much smaller than European/American sizes, so when you source products from Asia to sell in the European/American market, it’s necessary to convert those sizes to fit your target audience’s measurements.

The importance of Size Conversion to E-commerce businesses

When shopping overseas, it is effortless to order the wrong clothing size. That’s why you need to provide your customers with precise information about size conversion to guarantee them the best shopping experience.

Meet customers’ expectations

Clothing sizes
Clothing sizes

Every store owner wants happy customers. When a customer makes a clothing purchase in an e-commerce store, they will surely have certain expectations from your services (shipping time, customer policy, etc.) and, most importantly, the product. Happy customers get what they have expected, and for a clothing product, the sizing should be as precise as written in the description and fit the customers perfectly with no defects. By supplying your consumers with the exact size details, you can help decide their needs’ suitability and save their time.

Avoid returns and customer inconvenience

When you source products from Asia to the US market without converting the product sizes, your customers will likely buy the wrong-sized items. The scenario will surely frustrate them, and they will ask for a return as a result. If your return policy guarantees full benefits for your customers, it may not influence their overall shopping experience.

However, it’s always troublesome for a business owner to deal with returns as you will have to go through a whole process just to handle one order. Not to mention that returning items to the suppliers may be expensive, which earns you no overall profit. Or you might have to provide a refund if the item is not returnable.

As I’ve mentioned, receiving product returns might not be the worst-case – there’s still a chance to win back your customers’ trust if your return policy is generous and your customer service is in time. The worse scenario is that these wrong sized items can deter the customers from coming back to your store again, which is a big minus to your business growth. Therefore, you must ensure that your customers are informed about the size charts to get the right-sized items.

Be prepared in case the suppliers don’t provide size conversion

Sometimes an exact conversion does not exist. In such situations, you can seek to log precise measurements of the product, and you can check the inventory records, and the consumers can determine if the item is correct for them. If you can’t find measuring details on the product, ask whether the manufacturer is the safest one to deal with and whether the item is correct for your shop. Maybe an alternative product for which you can receive sizing details would be a safer choice would pose fewer problems.

Related posts:

How to convert Asian size to US size

Converting Asian sizes to US sizes with your suppliers

Convert Asian sizes to US sizes
Convert Asian sizes to US sizes

The first and foremost thing to do is to get in contact with your suppliers. Your suppliers usually must have a size and measurement chart of all the items they make, so you should email them and order an Asian-to-American conversion chart. When you have the size chart, you will find that it’s quick and convenient to convert your products from Asian sizes to American sizes. If you are using AliExpress or Shopify, you will be grateful as most suppliers on these platforms are willing to give you a sizing chart of their products, which makes your size conversion from Asian to American more seamless.

You could find yourself in a little binding if you cannot find the size charts for an item you’re interested in stocking. You may simply search for the same or related product on other e-commerce websites to solve this issue. They might have a size chart on their page, which will make it easier for you to deal with such a situation.

Converting Asian sizes to US sizes in your store

Once you’ve obtained the right size charts that possibly help you proceed with the Asian-to-American size conversion, you should tabulate those details and display them in how your customers can easily access them. As a store owner, you’re responsible for ensuring that both your prospective and returning customers can get the correct information to make the desired purchase.

Below are several common characteristics of area-specific size structures:

  • In China sizes, clothes are labeled in two numbers, although different sizing standards are used to measure two different parts of the body. For example, a Chinese size of 88-90 is also 165-170, or 36-37, and it’s equivalent to the US’s women 4-6.
  • Sizings in Japan usually consist of a system of letters and numbers, such as S-36 converted into the international standard of “XS”, which is extra small for American people.
  • In Korea, general numbers are used for sizing guidelines. For example, 90 in Korea is “XS” for the international standard for men’s clothes.
  • U.K. clothing sizes are usually one or two sizes bigger than the U.S. sizes.

Asian sizes to US sizes charts examples

Creating sizing charts for your online shop provides your consumers with valuable details they can use when choosing the best clothes to buy. You have to ensure that your size charts contain clear information – or else they will just be useless.

Here are some examples of Asian-to-American size charts to make your size conversion easier.

Clothes

Women’s clothes

InternationalUSUKChinaJapanKorea
XS46160-165/
84-86
S
36
5
44
XS68160/165
84/86
S
36
7
44
S810165/170
88-90
M
38
9
55
S1012165/170
88-90
M
38
9
55
M1214167-172/
92-96
L
40
11
66
M1616167-172/
92-96
L
40
11
66
L1818168-173/
98-102
LL, XL
42
13
77
L2020168-173/
98-102
LL, XL
42
13
77
XL2222170-176/
106-110
XXL
3L
15
88
XL2424170-176/
106-110
XXL
3L
15
88
XXL2626 4L
17
 
XXL2828 5L
19
 

Women’s clothes size charts by Blitzresults

Men’s clothes

InternationalUS/UKChinaJapanKorea
XS14 S
36
90
XS14.5 S
37
90
S15165
88-90
M
39
95
S15-15.5165
88-90
M
39
95
M15.5-16170
96-98
L
40
100
M16170
96-98
L
41
100
L16.5175
108-110
LL
XL
42
105
L17175
108-110
43105
XL17.5180
118-122
44110
XL17.5180
118-122
44110
XXL 185
126-130
  
XXL 185
126-130
  

Men’s clothes size chart by Blitzresults

Children’s clothing sizes

UKEuropeanUSAustralia
12m80 cm12-18 m 
18m80-86 cm18-24m18m
24m86-92 cm23/24m2
2-392-98 cm2T3
3-498-104 cm4T4
4-5104-110 cm55
5-6110-116 cm66
6-7116-122 cm6X-77
7-8122-128 cm7 to 88
8-9128-134 cm9 to 109
9-10134-140 cm1010
10-11140-146 cm1111
11-12146-152 cm1412

Children’s clothing sizes by Tripsavvy

Shoes

Women’s shoes

USUKChinaJapanKorea
3.5 3521.5220
4 3522220
52.535.522.5225
5.533623230
63.53723.5235
6.543824240
74.53924.5245
7.554025250
85.540.525250
974226260
9.57.54226265
1084427270
10.59.54527.5 
1110.54628 
1211.54728.8 
12.5134929 

Women’s shoe size chart by Blitzresults

Men’s shoes

USUKChinaJapanKorea
542723.5235
5.54.53924240
65.54024.5245
6.56.54125250
7.574225.5255
87.254326260
8.57.754426.5265
984527270
9.58.54627.5275
1094728280
119.547.528.5285
11.510.54829290
1211 29.5295
12.511.5 30300
1312  305
1412.5  310
14.513  315

Men’s shoe size chart by Blitzresults

Children’s shoes

UKEuropeanUSJapan
4204 ½ or 512 ½
4 ½215 or 5 ½13
521 or 225 ½ or 613 ½
5 ½22613 ½ or 14
6236 ½ or 714 or 14 ½
6 ½23 or 247 ½14 ½ or 15
7247 ½ or 815
7 ½258 or 915 ½
825 or 268 ½ or 916
8 ½269 ½16 ½
9279 ½ or 1016 ½ or 17
102810 ½ or 1117 ½
10 ½ or 112911½ or 1218 or 18 ½
11 ½3012 ½18
12311319 or 19 ½
12 ½3113 or 13 ½19 ½ or 20
1332120
13 ½32 ½1 ½20 ½
1331 ½ or 221
2342 ½ or 322

Children’s shoe size chart by Tripsavvy

Some tips for handling size conversion issues

Make sure to contact your suppliers in advance

Each supplier will use specific size guidelines, and certain manufacturers can get correct product dimensional information or “fit” information. Tell your supplier to present you with an Asian-US size chart and add the chart to your website. Be sure you follow the measurements or dimensions of your manufacturer. You should also not copy a supplier’s charts and use other suppliers’ as a default model.

Order samples before selling

If you’re still uncertain about the correct sizings even when provided with a size conversion chart, don’t hesitate to order some initial check-up samples. Order at least one size for each product you’re planning to sell and let your models wear it in advance to check the exact sizing. You can use the measurements from these samples as a reference to your manual Asian-to-US conversion size chart as well.

Display size charts based on categories and measurements

When you present size charts on your e-commerce website, make sure to filter them by categories such as men’s, women’s, or children’s clothing. Also, display detailed body measurements customized for each product, such as height, arm length, waist, hips, shoulders, etc. to help your customers visualize more easily.

Plug in customizable size chart

You can consider plugging in a customizable size chart extension to help minimize manual effort. An ideal custom size chart should be easy to design and applicable to any types of products available in store. It should create a professional appearance for your online store as well.

If you’re selling on Shopify, consider integrating the Size Chart on Shopify app store for FREE as the extension is a comprehensive solution to the uncomfortable sizing issues.

If you’re using other platforms rather than Shopify, such as Magento or any else, take a look at Size Chart on AVADA.io.

With AVADA Size Chart, you can get 11 ready-to-use templates for all your product types with just one instant click. You can design your size chart however you want, add/remove any elements, upload unlimited photos and images, and apply this size chart to almost every place on your website. See how intuitive your store can turn out with the AVADA Size Chart here.

AVADA Size Chart FREE
AVADA Size Chart FREE

Final words

A part of e-commerce consumers is hesitant to shop for clothes online for fear of getting the wrong sized items, which eventually results in unwanted returns, or if worse, getting stuck with a paid product they can’t even use. Sizing issues or errors is unavoidable when you source clothes from one region to another, especially Asia to the US since Asian sizes are much smaller. Therefore, you should understand the idea and conduct of size conversion to apply to your business and build a successful venture.

Sam Nguyen is the CEO and founder of Avada Commerce, an e-commerce solution provider headquartered in Singapore. He is an expert on the Shopify e-commerce platform for online stores and retail point-of-sale systems. Sam loves talking about e-commerce and he aims to help over a million online businesses grow and thrive.