Asian Size to US Size Conversions: Every Type Compared
Compare Asian-to-US conversions for shirts, pants, bras, and shoes while using supplier-specific body and garment measurements to make safer sizing recommendations.
Asian size to US size conversions are estimates because each supplier uses its own measurements and cut. A US medium might match an Asian large from one supplier. Another supplier may use a different label because the country, garment, cut, and pattern all affect the fit. Treat the charts below as estimates, then make your choice from the measurements on the exact product listing.
When I ran a print-on-demand apparel store on Shopify, two garments marked large fit like different US sizes. Returns made the lesson expensive. The supplier's measurements mattered more than any blanket conversion.
Key takeaways
Why do Asian clothing sizes run smaller than US sizes?
Asian size to US size conversions vary because countries and suppliers base labels on different measurements and patterns. China's GB/T 1335 and the US ASTM tables start from different body measurements. Japan and Korea also use their own labels. An Asian large can therefore represent several physical sizes.
China's GB/T 1335.1 standard defines labels for mass-produced men's garments. On a label such as 170/92B, the numbers give height and chest measurements in centimeters. The final letter describes body shape. Together, these details show the body dimensions behind the label.
The US ASTM D5585 reference covers adult female misses sizes. It gives designers baseline body measurements. Brands can use different measurements, which is why one US size 8 may fit differently from another.
The standards explain the labels, while the garment pattern determines the actual cut. An exporter might use Western measurements, allow a different tolerance, or attach a generic tag. In practice, I choose from the product's centimeter or inch measurements and use the letter to locate that option.
Asian shirt size to US size
Asian and US shirt letters can represent different chest values, so match chest or bust to the closest US range. The three charts below cover women, men, and children. A country label gives you a starting point. The body measurement decides the closest US label.
Work through the shirt references in this order,
- Women's shirts: Start with the fullest part of the bust, then choose the US label.
- Men's shirts: Start with the chest, then confirm the sleeve and shoulder measurements.
- Children's shirts: Match the child's current height before you consider the age band.
Each section starts with the main body measurement, then covers the fit boundary. The carried charts preserve the live article's data. Their original dataset is undocumented, so treat them as estimates. Let the current supplier measurements decide.
1. Women's Asian shirt size to US size
Asian and US women's shirt letters may represent different bust ranges, so compare the listed bust measurement. The chart lines up US sizes with Chinese height and bust codes, Korean labels, and Japanese labels. Choose enough room across the chest before assessing the waist.
You'll see repeated rows because several country labels can match one US letter size. If your measurement falls between rows, choose the larger garment measurement. Then check whether stretch or a relaxed cut changes the fit.
2. Men's Asian shirt size to US size
Match Asian and US men's shirts by chest and shoulder measurements before choosing a US size. The chart lines up US letters with Chinese body codes, Korean chest labels, and Japanese letters or numbers.
Check the shoulders separately from the chest. If the chest works but the shoulder looks narrow, I choose the larger size. The buyer needs enough shoulder room from the start.
3. Kid's Asian shirt size to US size
Use current height to convert children's shirts because Asian codes and US age bands differ. The Chinese and Japanese columns mainly use height-based numbers, while Korean labels follow a different series.
When you list children's clothing, ask for the garment length and chest width as well. Parents can compare those measurements with a shirt that already fits. This avoids assigning one national label to every child of the same age.
Asian pants size to US size
Asian and US pants labels may represent different waist, hip, rise, and inseam measurements. Compare the dimensions of the exact pair. The references below separate men's and women's pants. For men's pants, match the waist before checking rise and inseam. For women's pants, match waist and hips before reading across to the closest US number.
Use the two pants references as follows,
- Men's pants: Match the waist first, then check the rise and inseam.
- Women's pants: Match the waist and hips together before choosing a US number.
Choose the matching chart, then verify its secondary measurements.
1. Men's Asian pants size to US size
Chinese, Japanese, and US men's pants systems use different labels and intervals, so match the measured waist first. The chart compares US waist ranges with Chinese numbers, Japanese alpha labels, and international letters.
Lay a similar pair flat and measure the waistband. Double that figure before comparing it with the supplier's garment measurement. Include the inseam because it tells the buyer where the hem will fall.
2. Women's Asian pants size to US size
Chinese, Japanese, and US women's pants labels can map to different waist and hip measurements, so check both dimensions. The chart compares US numbered sizes with Chinese sizes, Japanese alpha or numeric labels, and international letters.
With rigid denim, compare the waist-based and hip-based sizes, then use the larger match. For stretch fabric, check the composition and stated stretch percentage. The finished waist and hip widths can also show whether the smaller option has enough room.
Asian bra size to US size
Asian and US bra systems use different cup sequences, while the complete fit still depends on the band and bust measurements together. The chart compares the sequences used in the US, China, and Japan. The same cup letter can represent a different fit across the columns.
Band size also changes cup volume, so two garments with the same cup letter can fit differently when their bands differ. A complete size combines the band and cup, so ask the supplier for the underbust and full-bust range of every option.
This chart translates cup-letter progression. The product chart supplies the band conversion and makes the final choice possible, particularly when the bra has structured cups or underwire.
Measure the underbust with the tape firm and level, then let the tape rest lightly around the fullest bust point. Compare both results with the supplier's range for each band and cup pair. When a listing gives cup letters alone, get the missing band chart before publishing a fit recommendation.
Asian shoe size to US size
Japanese, Chinese, Korean, and US shoe numbers use different scales, so convert them through foot length. The charts below separate men, women, babies, toddlers, and youth. These examples show Japan in centimeters and Korea in millimeters, while the Chinese listings use another number scale. Measure the foot and read across from its length.
Work through the six shoe references in this order,
- Men's shoes: Match the heel-to-toe length, allowing room for the toe box.
- Women's shoes: Begin with foot length, then check the width shown on the listing.
- Children's shoes: Find the correct age-stage table before matching the length.
- Baby shoes: Measure both feet while the child lies or sits.
- Toddler shoes: Take the measurement while the child stands because their weight spreads the foot.
- Youth shoes: Check the chart again where the range restarts its US numbers.
All six charts use foot length as the shared field.
1. Men's Asian shoe size to US size
Match Japanese, Chinese, and Korean men's shoe labels to a US size through heel-to-toe length. In the chart, each US size sits beside those country labels and the foot length in inches.
Measure both feet while standing, then use the longer measurement. Wide feet, heavy socks, or a pointed toe can change the fit even when length matches. Follow the supplier's stated allowance for extra space. If that detail is missing, ask the manufacturer or measure a sample before setting the conversion.
Check which length the listing reports because foot length runs from the heel to the longest toe. Insole length includes the room inside the shoe, while outsole length includes material around it. Those three figures describe different distances, so publish the same measurement type that the supplier used.
2. Women's Asian shoe size to US size
Convert Japanese, Chinese, and Korean women's shoes through foot length, then check width and toe shape. Beside each US size, the chart lists the country labels and foot length in inches.
At the same foot length, high heels and narrow lasts may call for a different size than sneakers. An insole length already includes fitting space, so match it with another insole measurement. If width or toe allowance is missing, get that detail or verify a sample before publishing the conversion.
3. Kid's Asian shoe size to US size
Asian and US children's shoe numbers can restart across growth stages, so choose the age-range chart before matching foot length. The baby, toddler, and youth charts may restart or overlap their US numbers. The age label identifies the correct table, while the current measurement chooses the row.
Children's feet grow at different rates, and one foot may be longer than the other. Put the actual length beside every child-size label so parents can choose from a current measurement. The birthday serves as a guide to the appropriate chart.
4. Baby shoe sizes (0-24 months)
Choose baby shoes by foot length and let the larger foot determine the row. The chart matches small US sizes with Japanese, Chinese, and Korean labels, then gives the corresponding length in inches.
Soft booties can allow more room than structured first-walker shoes, but the chart remains an estimate. Check the supplier's stated allowance or measure a sample, since the upper material and opening shape also determine whether the shoe stays on.
5. Toddler shoe sizes (2-4 years)
Measure a toddler's feet while they're standing because body weight makes each foot longer and wider. The chart compares US, Japanese, Chinese, and Korean labels with foot length in inches.
On both feet, measure from the back of the heel to the longest toe. If the child curls their toes, the result can come up short, so repeat the measurement before choosing a row.
6. Youth shoe sizes (4-12 years)
Japanese, Chinese, Korean, and US youth shoe numbers may restart within a sequence, so use foot length to identify the row. Match the inch value first, then read across to the country label and US size.
When the US numbering starts again, confirm the foot-length row against the supplier's chart before publishing. Each children's range and brand last sets its own breakpoint.
What "one size" or "free size" means
Free size is a single garment size that the supplier designs for a limited range of bodies. The label alone doesn't state the bust, waist, hip, or garment length it fits. Get those measurements from the exact supplier listing before you publish a recommendation.
Stretch, ties, or an oversized cut can extend the fit range, whereas firm seams and structured fabric restrict it. The hips, garment length, armholes, and shoulders each need a separate check.
When a supplier uses the phrase alone, I hold the listing. A useful listing gives the exact bust, waist, hip, length, and opening measurements from a sample or measured flat lay.
Check the supplier's size chart before listing
For any product, the exact supplier chart should override a general conversion. A marketplace combines factories and sellers with different patterns. Their grading rules and tolerances vary too. The same letter can appear on products with different measured widths.
Save the exact product, variant, and shop you intend to source. Dropship.io's Product Library shows sales trends, ratings, variants, related videos, and shop analytics. Fit comes from the supplier chart and a measured sample. Record the variant measurements from the supplier's original listing before writing the product page.
Use a generic conversion to spot an obvious mismatch. Let the supplier chart guide your recommendation, then confirm it against the received sample. If the two disagree, pause the listing and send the supplier a photo of the measured difference.
Keep a short sizing record for every apparel or footwear product,
- Source: Record the product, shop, variant, country-code label, and supplier listing URL.
- Chart: Copy the supplier's body and garment measurements separately, including their units.
- Sample: Measure one physical item at the same points shown on the chart.
- Publish: Put the supplier values and your US estimate in separate columns.
- Monitor: Tag each fit complaint by product and variant, then record whether it was too small, large, short, or long.
This record also works for hats, rings, and fitted protective gear. A small measurement error can make those products unusable.
Convert Asian Clothing Sizes for an Online Store
Publish both units, separate body from garment measurements, explain the fallback, and use same-variant fit reviews. Together, these steps turn the supplier's original chart into a buyer-facing size choice.
Apply them to every fitted listing,
- Publish supplier measurements: Show inches and centimeters for the points the supplier measures.
- Separate body and garment dimensions: Identify each set, then compare like with like: flat width to flat width or circumference to circumference.
- Explain the fallback: When the chart is incomplete, wait for a measured sample before publishing a US estimate.
- Sort reviews by fit: Use same-variant reviews that include the buyer's measurements and purchased size.
Place the chart beside the size selector, ahead of the shipping copy. On mobile, let the table scroll or stack while keeping the type readable. Test the smallest, middle, and largest rows before publishing a unit converter. Each row passes when its inch-to-centimeter result matches the supplier's displayed rounding.
When measurements are missing, sizing up is a temporary ordering estimate for a sample. Shoes require length and width, bras require band and cup, and rigid pants require waist and hips. Tell buyers which measurements led to the published recommendation.
Use reviews tied to the same product and variant. Keep fit comments connected to the current listing so their sizing advice applies to the item being sold.
How to take measurements for clothing
Match the buyer's body measurements at the exact points named on the supplier chart. Keep the tape level over the layer worn with the item.
Take only the measurements the product calls for,
- Chest or bust: Let the tape rest lightly around the fullest point.
- Waist: Measure the natural crease while breathing normally.
- Hips: Circle the fullest part with the feet together.
- Inseam: Run the tape from the crotch seam to the expected hem.
- Foot length: Stand on a sheet of paper and measure from the heel to the longest toe.
Body measurements show who may fit the item, and garment measurements show the maker's added room. For a shirt laid flat, double its body width before comparing it with chest circumference.
If a measurement falls between two sizes, take it again. Then choose based on the garment's cut and fabric. For a rigid item, I recommend the larger option near the top of a range. For stretch fabric, use the composition, stretch percentage, and finished width to judge the smaller option.
This approach works when the supplier publishes the same measurement you took. Some listings give S, M, and L alone. Request the missing chart or measure a sample, then build the conversion from those values.
FAQs for Asian size to US size
Asian-to-US sizing decisions depend on supplier measurements, return terms, and growth-stage charts.
How much should I size up from an Asian supplier?
Use one size up when fit notes support it, and use two when the product chart supports it. For a store listing, publish the US equivalent after supplier measurements or a measured sample supports the choice.
Does every Asian supplier use the same size chart?
Suppliers can use different patterns, tolerances, labels, and garment measurements. Before you promise a US equivalent, compare the exact listing's chart with a sample you've measured.
Can I return an item if the conversion is wrong?
A wrong-size return depends on the exact seller policy and supplier agreement that cover the order. Read both before ordering and record which party handles the cost when the received measurements differ from the published chart.
Do kids' Asian sizes convert like adult sizes?
Children's conversions use the correct growth-stage chart and the child's current height or foot length. Use age to identify the table, then use the current measurement to choose the row.
