👟 Shoe Size Calculator

Enter your foot length to automatically convert to Korean, US, European, Japanese, and Chinese (Asian) shoe sizes. Find accurate shoe sizes for international shopping or travel. Provides gender-specific sizing for more precise recommendations.

US Size

UK Size

EU Size

Japan (cm)

Korea (mm)

Inch (in)

📏 How to Measure
Stand with heel against wall and measure straight distance to longest toe. Measuring in afternoon gives most accurate results.

Converted Shoe Sizes

Type into any field and all the others update instantly. US/UK conversions change depending on the Men / Women / Kids tab.

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What is a Shoe Size Calculator?

A shoe size calculator automatically converts foot length into shoe sizes for major countries including Korea, US, Europe, Japan, China (Asia), and UK. Very useful when buying shoes locally during international travel or online shopping. Applies different conversion standards by gender to provide accurate sizes, accepting input in mm or cm. This calculator clarifies the right size when online stores use different size notations and each country has different shoe size systems.

Differences in International Shoe Size Systems

Korean shoe sizes directly indicate foot length in mm (e.g., 250, 260), increasing in 5mm increments. US sizing uses different standards for men and women, with women's sizes about 1.5 sizes larger than men's. European sizes use the 'Paris Point' system, increasing by 2/3cm (about 6.67mm) units. Japan similarly uses cm notation like Korea but extends to one decimal place (e.g., 25.0, 25.5). Chinese (Asian) sizes use mm units identical to Korea. UK sizing resembles US but runs about 0.5-1 size smaller.

Accurate Foot Length Measurement Method

Proper foot length measurement is crucial for accurate shoe sizing. Measure barefoot without socks. Stand with heel against wall or flat surface and measure straight distance to longest toe (usually big toe or second toe). Use ruler or tape measure, ideally precise to mm. Foot sizes may differ between feet, so measure both and use the larger measurement as reference. Afternoon or evening measurement is most accurate because feet slightly swell throughout the day.

Men's vs Women's Shoe Size Differences

Even with identical foot length, men's and women's shoe sizes are notated differently. By US standards, women's sizes are approximately 1.5-2 sizes larger than men's. For example, with 250mm foot length, men wear US 8 while women wear US 9.5. This occurs because women's shoe size numbering starts smaller than men's. Korean, Japanese, and Chinese (Asian) sizes directly indicate foot length so they're identical for both genders. European sizes also often use unisex notation, though some brands distinguish by gender. Always verify gender standard when buying shoes.

Shoe Size Selection Tips for Online Shopping

When buying shoes online, carefully check reviews as fit varies by brand. If reviews mention 'runs small' or 'runs large', adjust size accordingly. Sneakers should have about 1cm toe room, dress shoes about 5mm. For boots, consider socks and choose slightly larger. If you have wide feet, look for Wide Fit products or choose half size up. Leather shoes stretch with wear so choose snug fit; choose sneakers with slight room. Check exchange/return policies and shop where free exchanges are available when possible.

Shoe Size and Foot Health Relationship

Ill-fitting shoes can cause serious foot health problems. Too-small shoes cause bunions (big toe bending outward), corns, calluses, and ingrown toenails. Too-large shoes cause blisters from foot movement inside shoe and increase risk of ankle sprains or falls. Long-term effects can impact knees, pelvis, and spine causing chronic pain. For children, ill-fitting shoes during growth can impede normal foot development, requiring extra caution. Consider not just foot length but also width and instep height when choosing shoes. For special foot shapes or pain, consult orthopedic specialist about custom insoles or corrective footwear.

How to Measure Your Foot Length in 6 Steps

1) Place a sheet of paper on the floor against a wall. 2) Stand barefoot on the paper with your heel pressed firmly against the wall. 3) With your weight on the foot, mark the tip of your longest toe with a pencil. 4) Measure the straight-line distance from the wall to the mark in millimeters. 5) Measure both feet and use the longer measurement as your final foot length. 6) Measure in the evening when feet are slightly swollen, and add half a size of room when choosing a shoe.

Brand Fit Differences and Selection Tips

The same labeled size can fit very differently across brands. Nike tends to run narrow and snug, so many shoppers size up by half a size. Adidas tends to run roomier through the toe box, so a true-to-size pick usually works well. Boot brands like Dr. Martens use leather that stretches with wear, so sizing down half a size is the common recommendation. Converse sizing tends to run large compared to the labeled size, so consider sizing down. When shopping online, always check the brand's own measured size chart together with fit comments in customer reviews to reduce return risk.

GUIDE

International Shoe Size Conversion Chart

Men (US 6-13)

US	UK	EU	Korea (mm)
6	5.5	38.5	245
7	6.5	40	255
8	7.5	41	260
9	8.5	42.5	270
10	9.5	44	280
11	10.5	45	285
12	11.5	46.5	295
13	12.5	47.5	305

Women (US 5-11)

US	UK	EU	Korea (mm)
5	3	35.5	225
6	4	37	230
7	5	38	240
8	6	39.5	250
9	7	40.5	255
10	8	42	265
11	9	43	275

Frequently asked questions

When is the best time to measure foot length for accuracy?

Feet swell slightly throughout the day, so measure barefoot in the afternoon or evening, and always measure both feet and use the larger measurement as your reference.

Why do men's and women's sizes differ for the same foot length?

US sizing starts women's size numbering lower than men's, so the same 250mm foot comes out to roughly US 8 for men versus US 9.5 for women.

How do shoe size notations differ by country?

Korea and China (Asia) use raw mm, Japan uses cm with one decimal place (e.g., 25.5), Europe uses the Paris Point system (2/3cm increments), and UK sizing runs about 0.5-1 size smaller than US.

Should I leave different amounts of room for sneakers versus dress shoes?

Yes - sneakers should have about 1cm of toe room while dress shoes need only about 5mm; if you have wide feet, look for a Wide Fit option or size up by half a size.

How should I choose between Wide (W) and Extra Wide (EW) sizing?

If you have a wider forefoot or higher instep, choose a Wide (W) or Extra Wide (EEE/EW) width option instead of standard (Medium) width, keeping the same length. Not every brand offers wide widths, so always check the product page's width options before ordering.

What should I watch out for when picking kids' shoe sizes?

Children's feet grow quickly, so leaving about 1-1.5cm of growth room at the toe is common, but sizing up too much can hinder walking and foot development. Re-measure foot length every 2-3 months, and rely on each brand's own measured size chart since kids' sizing varies more between brands.