SuperBuy Sizing Conversion: Asian Charts to US Fits

Why Sizing Errors Are the Most Common Return Reason

In 2026, sizing remains the number one reason SuperBuy buyers request returns, exchange disputes, or simply accept unwearable items. The problem is not that Asian sizing is "wrong." It is that it is different — different body proportions, different grading systems, and different assumptions about fit. A "Large" on a Chinese spreadsheet is designed for a body profile that differs from the average US Large in shoulder width, arm length, and torso proportions.

The solution is not to size up blindly. It is to measure your own body, measure a garment you already own that fits well, and compare those numbers directly to the spreadsheet's size chart. This guide gives you the conversion framework, the measurement techniques, and the category-specific adjustments that turn guessing into precision.

The Measurement Foundation

Before you can use any size chart, you need four baseline measurements. Take these once, write them down, and reference them every time you order. All measurements should be taken in centimeters, since Chinese size charts universally use the metric system.

**Chest / Bust**: Wrap a measuring tape around the fullest part of your chest, keeping the tape level and snug but not tight. Exhale normally — do not hold your breath.

**Shoulder Width**: Measure from the outer edge of one shoulder bone to the outer edge of the other, across your upper back.

**Sleeve Length**: Bend your arm slightly and measure from the outer shoulder edge to your wrist bone.

**Total Length**: For tops, measure from the highest shoulder point to your desired hem. For pants, measure from your natural waist to your ankle.

For pants and shorts, add two more measurements:

**Waist**: Measure around your natural waistline, where your pants normally sit. Do not use your jean size — measure your actual waist.

**Inseam**: Measure from the crotch seam to your ankle along the inside of your leg.

These six numbers are your personal sizing baseline. Every size chart you encounter should be compared against these numbers, not against your US size letter.

The Conversion Framework: Not Just One Size Up

The naive approach to Asian sizing is "order one size up." This works sometimes but fails often, especially for items with non-standard fits. A better framework is to compare your actual centimeter measurements to the chart's flat-lay measurements, then apply category-specific adjustments.

Flat-lay measurements on Chinese size charts represent the garment laid flat and measured across one side. For chest width, the chart shows half the total circumference. If the chart lists "Chest 58 cm," the full chest circumference is 116 cm. Always double flat-lay width measurements before comparing to your body.

Your US Size	Your Chest (cm)	Typical Asian Chart Match	Adjusted Order
XS	86–90	M	M or L for oversized
S	91–96	L	L or XL for oversized
M	97–102	XL	XL or 2XL for oversized
L	103–108	2XL	2XL or 3XL for oversized
XL	109–114	3XL	3XL or 4XL for oversized
XXL	115–120	4XL	4XL or 5XL for oversized

Category-Specific Adjustments

Different clothing categories require different adjustments beyond the basic conversion. Here are the most important ones for SuperBuy spreadsheet buyers in 2026:

Hoodies and Sweaters

Oversized hoodies and drop-shoulder styles are intentionally larger than standard fits. If the spreadsheet describes the item as "oversized" or "boxy," add 6–12 cm to your normal chest measurement when selecting a size. A 100 cm chest measurement might require a chart size of 112–120 cm chest for the intended oversized look. If you prefer a standard fit, use your normal measurement.

For drop-shoulder hoodies, shoulder width is more important than chest width. The shoulder seam should sit 8–12 cm past your natural shoulder point. If it sits at your natural shoulder, the hoodie will look fitted rather than oversized.

T-Shirts

T-shirt sizing is simpler than hoodies but still tricky because of fabric variation. A 250 gsm heavyweight cotton tee will fit differently than a 180 gsm lightweight tee even at the same chart measurements. Heavyweight cotton has less stretch and drapes more rigidly. Size up 1 cm for heavyweight, down 1 cm for lightweight.

Vintage-wash and enzyme-washed tees often shrink 3–5% on the first wash. If the chart measurements are for the unwashed garment, subtract 3–5% from the chest and length measurements to estimate post-wash fit. When in doubt, size up one level for vintage washes.

Pants and Shorts

Pants are the most error-prone category because Chinese sizing charts often use waist measurements that do not correspond to US sizing conventions. A "32" on a Chinese chart may represent a 32-inch measurement, or it may represent an Asian sizing grade where "32" means something closer to a US 30.

Always use the centimeter measurements on the chart, not the size number. For waist, add 2–4 cm to your actual waist measurement for comfort. For inseam, add 1–2 cm if you want a slight break at the shoe, subtract 1–2 cm for a cropped look. Cargo pants and relaxed-fit styles add 3–5 cm to the thigh measurement for the intended silhouette.

Chinese pants size charts sometimes list "waist" as the flat-lay measurement, meaning half the total circumference. A chart that says "Waist 42 cm" means a total waist of 84 cm, not 42 cm. Always check whether the chart specifies flat-lay or full circumference.

Shoes

Shoe sizing conversion is simpler than clothing because insole length is a direct measurement. The most reliable method is to measure your bare foot from heel to longest toe, then add 0.5 cm for a snug fit or 1.0 cm for a comfortable fit. Compare this total to the chart's insole length measurement.

For example, a 27.5 cm foot with 1.0 cm added equals 28.5 cm. If the chart shows EU 44 = 28.0 cm insole and EU 45 = 29.0 cm insole, the 28.5 cm foot falls between sizes. In this case, choose based on shoe type: for sneakers with thick socks, go up to 29.0 cm (EU 45). For low-profile shoes with thin socks, 28.0 cm (EU 44) with thin insoles may work.

???

The recommended extra length to add to your bare foot measurement when comparing to a spreadsheet insole length chart.

Jackets and Outerwear

Jackets require the most size-up because they are designed to be worn over other clothing. A jacket that fits perfectly over a T-shirt will be too tight over a hoodie. When selecting jacket size, measure your chest while wearing the thickest layer you intend to wear underneath, then add 4–6 cm for movement comfort.

Puffer jackets have additional bulk from fill, which compresses slightly when worn but still adds volume. Add 2–3 cm beyond your normal jacket adjustment for puffers. Hard-shell jackets with linings add 1–2 cm. Always check whether the chart measurements are with or without fill compression — some charts measure deflated, others measure naturally lofted.

When the Chart Is Missing or Wrong

Not every spreadsheet listing includes a size chart. Some sellers use generic charts that do not match the actual garment. When you encounter a listing without a chart, you have three options:

Message the seller through SuperBuy: Ask for flat-lay measurements of the specific item in your desired size. Most sellers respond within 24–48 hours.

Search Reddit for the item: Other buyers may have posted QC photos with measurements or fit reviews.

Order one size as a test: If the item is inexpensive, order your best-guess size, inspect the QC measurements, and adjust for a second order if needed.

When the chart seems wrong — for example, a "Large" hoodie with a 52 cm chest that should be 60+ cm — trust your measurement instincts over the label. A 52 cm flat-lay chest is a 104 cm total, which corresponds to a US Small, not a Large. This is a common chart error where sellers copy generic templates without adjusting for their actual product grading.

Building a Personal Sizing Database

The most efficient long-term strategy is to track your own sizing data across orders. Create a simple document with these columns:

Item name and spreadsheet source

Chart size ordered

Chart chest / waist / length measurements

Your actual body measurements at time of order

Post-delivery fit assessment (too small, perfect, too large)

Adjusted size for future orders from same seller

Fabric weight or type (affects fit)

After 5–10 orders, you will have a personalized conversion database that eliminates guesswork. You will know that Seller A's hoodies run small by one size, that Seller B's tees shrink 5%, and that Seller C's jackets are true-to-chart. This data is more valuable than any generic conversion table because it reflects your body and your preferences.

Bottom Line: Measure First, Order Second

Sizing errors are expensive — not just in return fees and shipping costs, but in time, disappointment, and the frustration of owning an unwearable item. The fix is systematic: measure your body in centimeters, compare to flat-lay chart measurements, apply category-specific adjustments, and track your results over time. Never order by size letter alone. Never assume "one size up" is always right. And never skip the chart because you are in a hurry.

The five minutes spent measuring and converting will save you hours of return negotiations and weeks of waiting for replacements.

*Find items worth measuring for? Browse the full directory{target="_blank" rel="noopener nofollow"}.*