Shoe Size Conversion Calculator
Convert shoe sizes between different countries and measurement systems. Get accurate conversions for US, UK, EU, Japan, China, and more.
Input Your Size
Foot Measurement
Your Foot Length:
25 cm
9.84 inches
💡 Measure your feet later in the day
💡 Fit to your larger foot
💡 Leave room for swelling
US/Canada Women
US/Canada Men
UK/India
European Union
Japan/Mexico
China
Conversion Formulas
US/Canada
Women: 3L - 21
Men: 3L - 22
(L in inches)
UK/India
Adult: 3L - 23
(L in inches)
European Union
Size: (3/2)L + 2
(L in cm)
Japan/Mexico
Size: L
(L in cm)
China
Size: 2L - 10
(L in cm)
Understanding Shoe Sizing Systems
Shoe size is a complicated topic due to the lack of a global standard. Differences in the way shoe size is measured and determined in various countries, between men's and women's feet, in the way different brands label and manufacture their shoes, and even the fact that individuals often have different sized feet, all contribute to the complication in finding a proper shoe size.
Much of the reason for a lack of a standard is due to shoe making having existed long before mass production. Shoe makers had to make shoes individually, and thus would cater to the individual, wherever they may have been. This led to the development of many different methods of measurement and fabrication, and there was not enough motivation for different countries or regions to collaborate and develop a standard. As with other cases such as units of measurement, once various methods become ingrained in a society, it is difficult to change them even if it would create a better system.
Our calculator estimates shoe size solely based on foot length. While there are many other factors that impact overall shoe fit (discussed below), our calculator provides a consistent reference through which you can identify a shoe that is most likely to be a good fit. The tables and formulas provided are our best interpretation of shoe size based on foot length, and may differ slightly from those provided by different websites, manufacturers, and brands.
Comprehensive Shoe Size Charts
Women's Shoe Sizes
| US/CA | UK/IN | EU | JP/MX | CN | Inches | CM |
|---|---|---|---|---|---|---|
| 4 | 2 | 34 | 21 | 32 | 8.3 | 21.2 |
| 4.5 | 2.5 | 34 | 21.5 | 33 | 8.5 | 21.6 |
| 5 | 3 | 35 | 22 | 34 | 8.7 | 22.0 |
| 5.5 | 3.5 | 36 | 22.5 | 35 | 8.8 | 22.4 |
| 6 | 4 | 36 | 23 | 36 | 9.0 | 22.9 |
| 6.5 | 4.5 | 37 | 23.5 | 37 | 9.2 | 23.3 |
| 7 | 5 | 38 | 23.5 | 37 | 9.3 | 23.7 |
| 7.5 | 5.5 | 38 | 24 | 38 | 9.5 | 24.1 |
| 8 | 6 | 39 | 24.5 | 39 | 9.7 | 24.6 |
| 8.5 | 6.5 | 39 | 25 | 40 | 9.8 | 25.0 |
| 9 | 7 | 40 | 25.5 | 41 | 10.0 | 25.4 |
| 9.5 | 7.5 | 41 | 26 | 42 | 10.2 | 25.8 |
| 10 | 8 | 41 | 26 | 42 | 10.3 | 26.2 |
| 10.5 | 8.5 | 42 | 26.5 | 43 | 10.5 | 26.7 |
| 11 | 9 | 43 | 27 | 44 | 10.7 | 27.1 |
Foot Measurement Systems
Shoe size estimation is based on the measurement of foot size. A given shoe size is a function of the manufacturer, the shoe last (the physical form used to manufacture and repair shoes), a country's standards, and more. There are numerous foot measurement systems including the Brannock device, theRITZ stick, and the Mondopoint system.
Brannock Device
The Brannock device is used to acquire three key measurements:
- Foot length: Distance from heel to longest toe
- Foot width: Width at the ball of the foot
- Arch length: Distance from heel to inside ball
US Men: (length × 3) - 22
US Women: (length × 3) - 21
RITZ Stick
The RITZ stick was the standard measuring device prior to the Brannock device. It is a wooden slide ruler with men's and women's shoe sizes and a conversion chart on the opposite side for converting between width and length.
Both devices are useful for quick measurements, but shoe size is only one of many factors that need to be considered for proper fit.
Mondopoint System
The Mondopoint system is commonly used in the sports industry for athletic shoes like ski boots, skates, and ballet shoes. It's also the primary shoe sizing system in Russia, East Germany, Taiwan, China, Japan, and South Korea.
Foot Length
Horizontal distance from heel to longest toe (mm)
Foot Width
Distance between 1st and 5th metatarsophalangeal joints (mm)
Perimeter
Circumference around the ball of the foot (mm)
Since it considers width and circumference, Mondopoint generally allows for better fitting than systems based primarily on foot length.
How to Find the Right Shoe
Finding the right shoe can be difficult as there are many factors that determine how well a shoe fits. Even with the same foot length, two people may find the same shoe to fit very differently.
Factors Impacting Shoe Fit
👣 Foot Length
Although foot length is an important estimator, two people with the same foot length may find the same shoe fits very differently. Size varies between brands and even models within the same brand.
📏 Foot Width
Not only the width at the widest point, but width throughout the foot impacts fit. Increasingly, shoes include different width sizes, though there's no standard for width labeling.
🦶 Foot Shape
Overall shape including circumference, arch position, and toe structure significantly impact fit. Different brands design for different foot shapes.
⚥ Sex Differences
Men and women have differently shaped feet. Women's feet aren't just scaled-down versions. Key differences occur around the arch, lateral side, first toe, and ball of the foot.
🎂 Age Changes
As we age, changes in ligaments and tendons can result in feet lengthening and widening. Your size 9 from youth may become a size 10 or 11 later in life.
🏭 Manufacturer
Different manufacturers and brands use different shoe lasts and processes. Length, width, and overall fit vary even if shoes are labeled the same size.
How to Measure Your Foot Correctly
Measure Later in the Day
Feet swell as the day progresses. Measure in the afternoon or evening for accurate sizing.
Use Proper Tools
Use a Brannock device or similar measurement tool for more accurate readings than a regular ruler.
Fit to Largest Foot
Many people have different sized feet. It's better to have a slightly loose shoe than too tight.
Consider Usage Context
For everyday wear, leave more room. For sports like climbing or soccer, tighter fit may be preferred.