Microapp

Shoe Size Converter

The Shoe Size Converter handles all five major international sizing systems — US, UK, EU, JP, and AU — for men, women, and kids categories. Pick your category, the system you already know, enter the size, and see the equivalent in all other systems plus foot length in cm and inches. The conversions follow standard industry charts (Brannock + Mondopoint) — but brand-specific sizing varies by half a size in either direction, so always check the brand's specific size chart for snug-fit shoes.

Convert shoe sizes between US, UK, EU, JP, and AU systems. Pick category (men/women/kids), enter a known size in any system, and see the equivalent in all others. Includes foot length in cm — the international ISO Mondopoint standard. Whole and half sizes only.

Sizing differs by category — especially women's.

Pick the system you already know.

Half sizes supported (5.5, 9.5, etc.).

Closest match for US 9 (men)
Foot length: 270 mm (27.0 cm / 10.63")
US
9
UK
8.5
EU
42.5
JP (cm)
27
AU
8.5
How to measure your feet at home: Stand on a piece of paper with your heel against a wall. Mark the longest toe (often not the big toe). Measure heel-to-mark in mm. Do this in late afternoon (feet swell) and on both feet (one is usually larger). Order to fit the larger foot.
Educational tool only. Brand-specific sizing varies by ±0.5 size for the same nominal size — Nike runs slightly small, New Balance often slightly wide, Vans roomier in the toe box, etc. When in doubt, check the brand's specific size chart and read user reviews. Foot width (B/D/EE) also matters for fit and isn't captured here.

How to use

  1. 1

    Pick category: men's, women's, or kids. Sizing differs significantly between categories.

  2. 2

    Pick the size system you already know (US, UK, EU, JP, AU, or foot length in cm).

  3. 3

    Enter your size value. Half sizes (5.5, 9.5, etc.) are supported.

  4. 4

    The calculator returns the equivalent size in all other systems plus foot length in mm/cm/inches.

  5. 5

    Use the foot-measurement instructions below if you don't know any size — measure your foot in mm, then enter as cm.

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📏 Length Converter 🔄 Unit Converter 📐 Aspect Ratio Calculator

Frequently asked questions

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What This Calculator Does

The Microapp Shoe Size Converter handles all five major international sizing systems — US, UK, EU, JP, AU — across men's, women's, and kids' categories. Pick what you know, see what you wear in every other system. Plus foot length in mm, cm, and inches for the precise option.

Worked example. Men's US 9:
• UK: 8.5
• EU: 42.5
• JP: 27 cm
• AU: 8.5
• Foot length: ~270 mm (10.6")

The Five Systems

US (Brannock): Most common in North America. Whole and half sizes. Men's and women's are different scales (women's are 1.5 larger for same foot length).

UK: Same numerical scale as US but men's are 0.5-1.5 sizes smaller depending on category. Used in UK, Australia (mostly), India, and many Commonwealth countries.

EU (Continental): Unisex single scale. EU 42 fits a 42, regardless of gender. Used across Europe, including some neighboring countries.

JP (Japan): Foot length in centimeters. JP 27 = 27 cm foot. Direct, unambiguous, and growing in popularity globally.

AU (Australia): Mostly aligns with UK; Australian women's sizes can use either UK or US conventions depending on brand.

How to Measure Your Feet

  1. Stand on a piece of paper, heel against a wall.
  2. Have someone mark where your longest toe ends (often the second toe, not the big toe).
  3. Measure heel-to-mark in millimeters.
  4. Repeat for the other foot — they're rarely the same size.
  5. Order to fit the larger foot.

Best time: late afternoon. Feet swell 4-5% throughout the day; measuring in the morning gives a slightly small reading.

Brand-Specific Sizing

Standard size charts assume a standard last shape. Real brands deviate:

  • Nike: Runs about half a size small for most lines (Air Max, Pegasus). Order half size up.
  • Adidas: Mostly true to size, but Stan Smiths run slightly large.
  • New Balance: True to size, available in widths.
  • Vans: Roomier toe box; true to size length but feels wider.
  • Converse: Notorious half-size large; order down.
  • Allen Edmonds (dress): True to size in length, available in widths.
  • Doc Martens: True to size but very stiff initially; expect half-size adjustment over break-in.

Always check user reviews for "fits true to size" or "runs small/large" feedback before first-time brand purchases.

Width Matters

This calculator handles length only. Width designations:

  • US Men's: B (narrow), D (medium / standard), 2E (wide), 4E (extra wide)
  • US Women's: 2A (narrow), B (medium / standard), D (wide)
  • UK/EU: less standardized; some brands use F/G for wide

For wide or narrow feet, look for brands that publish width-specific lasts: New Balance, Brooks, Hoka, Allen Edmonds. Most casual sneakers are made on a single width that fits 70%+ of feet adequately.

Common Mistakes

Trusting "I'm a US 9 in everything." Sizes vary by brand AND by shoe type within a brand. Running shoes typically run half-size large to leave room for swelling during runs.

Not measuring both feet. ~70% of people have a measurable size difference between feet. Order to fit the larger.

Ordering boots in your sneaker size. Boots typically need a half-size larger to accommodate thick socks.

Sizing up for "comfort" in dress shoes. Dress shoes should fit snug at first; leather stretches. Sizing up causes heel slip and premature wear.

Educational Tool

This calculator uses standard industry conversions. For best fit, measure your feet, check brand-specific size charts, read user reviews, and prefer retailers with free returns for first-time purchases.

Related Tools

For general unit conversions (length, weight, volume), use the Length Converter and Unit Converter.