Japanese Size Converter
Convert clothing, shoe, and ring sizes between Japanese and international standards (US, EU, UK).
Size Conversion Tips
Japanese Clothing Sizes: Japanese sizes typically run 1-2 sizes smaller than US sizes.
Number System: Women's clothing in Japan often uses odd numbers (7号, 9号, 11号).
Fit: Japanese clothing tends to have a slimmer fit compared to Western brands.
Understanding Japanese Sizing Systems
Japanese sizing differs fundamentally from Western sizing systems due to different body type averages and measurement philosophies. Where Western sizing often uses abstract letter codes (S/M/L) or arbitrary numbers that vary wildly by brand, Japanese sizing strives for more standardized, measurement-based systems - though brand variation still exists.
Clothing Sizes: Japanese clothing sizes use a combination of letter sizes (S, M, L, LL, 3L) and number systems. Women's clothing often uses 号 (gō) numbers: 7号, 9号, 11号, etc. These numbers roughly correspond to specific bust measurements in centimeters. The LL designation (equivalent to XL) reflects how Japanese sizing extends beyond standard small-medium-large. What's particularly important to note is that Japanese sizing typically runs 1-2 sizes smaller than US sizing, and the cut is often designed for narrower shoulders and shorter torsos.
Shoe Sizes: Japan uses a refreshingly straightforward centimeter-based system. A size 25.0 means your foot length is 25.0 cm from heel to toe. This removes much of the guesswork from online shoe shopping - simply measure your foot in centimeters and find the matching size. Additionally, Japanese shoe sizing includes width measurements (E, EE, EEE, EEEE) because foot width significantly affects comfort and fit.
Ring Sizes: Japanese rings use a 号 (gō) number system with odd numbers only (1, 3, 5, 7... 27). Each number corresponds to a specific inner circumference in millimeters. For example, size 13 equals 52mm circumference or approximately 16mm diameter. This system is more precise than the arbitrary US numerical system, but it requires knowing your exact ring size through professional measurement.
Japanese Shopping Guide: Getting the Right Fit
Shopping for Japanese clothing and accessories - whether in Japan or online - requires a different approach than Western shopping. Here's how to ensure you get items that actually fit:
Before You Shop
- Measure yourself accurately in centimeters: bust, waist, hips, inseam, shoulders, and arm length
- For shoes: Trace your foot on paper and measure heel to longest toe in cm, plus measure width at widest point
- For rings: Get professionally sized at a jeweler or use a ring sizer tool for circumference in mm
- Keep measurements handy - store them in your phone notes for quick reference when shopping
While Shopping
- Always check the brand's specific size chart - don't assume standard conversions
- Look for actual measurements in the product description (chest: 88cm, length: 60cm, etc.)
- Read customer reviews for fit feedback: "runs small," "narrow cut," "true to size"
- Consider sizing up if you're between sizes or prefer a looser fit - Japanese cuts tend to be slim
- Check fabric composition - stretch fabrics are more forgiving for size variations
Shopping in Japan vs. Online
In Physical Stores: Many Japanese stores provide measuring tape at fitting rooms. Staff are usually happy to help you find the right size. Don't hesitate to try multiple sizes - fitting rooms are expected to be used. Department stores (デパート) often have the most size variety including larger sizes.
Online Shopping: Sites like ZOZO Town, Rakuten, and UNIQLO provide detailed measurements for each item. Use browser translation to understand size charts. Check return policies - international returns can be expensive. Proxy shopping services can help if you're buying from Japanese-only sites.
Special Considerations for Larger Sizes: Finding plus sizes in Japan can be challenging. Look for brands that specialize in larger sizes like Bellemaison, Nissen, or international brands with Japanese presence (H&M, ZARA, UNIQLO). Department store "Queen Size" (クイーンサイズ) sections cater to larger sizes. Online retailers often have better plus-size selection than physical stores.
Measurement Tips for Accurate Sizing
Accurate measurements are crucial for Japanese shopping since sizing is more measurement-specific than Western sizing. Here's how to measure yourself correctly:
Clothing Measurements
- Bust/Chest: Measure around the fullest part, keeping tape parallel to ground. Wear a bra for bust measurement.
- Waist: Measure around the narrowest part of your natural waistline, typically 1-2 inches above belly button.
- Hips: Measure around the fullest part of your hips and buttocks, standing with feet together.
- Inseam: Measure from crotch to ankle bone along inner leg. Best done with pants that fit well.
- Shoulder Width: Measure from one shoulder bone to the other across the back.
Shoe & Ring Measurements
- Foot Length: Stand on paper, mark heel and longest toe, measure in cm. Do this in the evening when feet are largest.
- Foot Width: Measure the widest part of your foot from side to side while standing.
- Ring Size: Wrap string around finger base, mark overlap, measure length in mm. Professional jeweler sizing is most accurate.
- Ring Fit: Fingers swell in heat and shrink in cold. Measure at room temperature, multiple times of day.
Common Measurement Mistakes to Avoid
- Measuring over bulky clothing - wear fitted clothing or measure against skin
- Pulling tape too tight or leaving it too loose - it should lie flat without digging in
- Not keeping tape parallel to ground for chest/waist/hip measurements
- Measuring shoes while sitting - always measure while standing with weight on foot
- Using old measurements - body measurements change, re-measure every 6-12 months
Frequently Asked Questions
Why are Japanese sizes smaller than Western sizes?
Japanese sizing is based on average Japanese body measurements, which historically have been smaller than Western averages. A Japanese Large (L) typically equals a Western Small or Medium. This isn't about quality or fit - it's simply different body type standards. Always check actual measurements in centimeters rather than relying on letter sizes when shopping online.
What does 'フリーサイズ' (free size) mean?
フリーサイズ (furii saizu) or 'one size fits all' is common in Japanese fashion, especially for accessories, casual wear, and stretchy garments. It's designed to fit the average Japanese body type, typically equivalent to Western XS-M. If you're larger than Western Medium or have a non-average body type, フリーサイズ items may not fit comfortably. Always check the actual dimensions provided.
How do I measure myself for Japanese clothing?
Use a soft measuring tape and measure in centimeters. For clothing: chest/bust (widest part), waist (narrowest part), and hips (widest part). For shoes: trace your foot on paper and measure heel to longest toe in cm. For rings: measure finger circumference in mm or visit a jeweler. Japanese sizing is more precise with measurements than Western sizing, so accurate measurements are crucial for online shopping.
Do all Japanese brands use the same sizing?
No, sizing can vary significantly between brands, just like in Western fashion. Fast fashion brands (UNIQLO, GU) often use sizing closer to Western standards to appeal to international markets. Traditional Japanese brands and boutique shops tend to run smaller. Always check each brand's specific size chart and read customer reviews about fit before purchasing.
What are E, EE, and EEE shoe widths?
Japanese shoe sizing includes width measurements: E (narrow), EE (medium/standard), EEE (wide), and EEEE (extra wide). This is different from Western B, D, and EE systems. Most Japanese shoes are designed for narrower feet compared to Western shoes. If you have wide feet, specifically look for EEE or EEEE widths, or consider sizing up in length for better width accommodation.
Dedicated Size Pages
Jump to focused size charts and quick lookup pages.