Are shoe size conversions exact?

No—brands use different lasts and rounding. This tool maps every input through one foot-length estimate (mondo-style cm), then derives US, UK, EU, and JP-style labels from that. Example: men’s US 9 → ~27 cm → UK 8, EU 42.5, JP 27. Nike, Adidas, and dress makers can still differ by ±0.5 US or half an EU size—always check the model’s official chart before buying.

What is men's US 9 in UK and EU?

In this model (default on the page): men’s US 9 ≈ UK 8, EU 42.5, foot length ~27 cm, JP-style 27 cm. Formula: foot_cm ≈ 18 + US → 18 + 9 = 27 cm; UK ≈ US − 1 → 8; EU ≈ 1.5 × 27 + 2 = 42.5. Men’s US 11 maps to UK 10, EU 45.5, ~29 cm.

What is women's US 8 in UK and EU?

Women’s US 8 → UK 6, EU 38, ~24 cm foot (women’s offset: foot_cm ≈ 16 + US → 24 cm). Do not use men’s US 8 here—that is a different foot length (~26 cm, about US 8 men / UK 7). Women’s US 10 → UK 8, EU 41, ~26 cm.

Why separate men’s and women’s shoe sizes?

US and UK numbering uses different offsets for men’s vs women’s footwear at the same foot length. At ~27 cm mondo: men’s US 9 (UK 8) but women’s grading at the same 27 cm is US 11 (UK 9)—different numbers, same foot. Pick the correct gender so UK ≈ US − 1 (men) or UK ≈ US − 2 (women) applies.

What does EU shoe size mean?

“EU” here is continental European sizing tied to foot length: EU ≈ 1.5 × foot_cm + 2. Women’s EU 38 input → US 8, UK 6, ~24 cm. Men’s EU 42 → US 8.5, UK 7.5, ~26.7 cm. Retailers often round EU to whole numbers (38, 39, 42) while this tool keeps half sizes where the math lands on .5.

What is JP (Japan) shoe size on this calculator?

We show JP as the foot length rounded to the nearest whole centimeter—common mondo shorthand on Japanese tags. Men’s US 9 → JP 27 (from ~27 cm). That is a comparison anchor, not every brand’s internal JP code. If the tag lists 27.0 or 27.5 cm mondo, enter foot length (cm) directly for the closest match.

How do I convert UK shoe size to US?

Men’s: US ≈ UK + 1. Men’s UK 8 (entered as UK source) → US 9, EU 42.5, ~27 cm. Women’s: US ≈ UK + 2. Women’s UK 6 aligns with women’s US 8 (UK 6, US 8). UK half sizes are supported; outputs round to the nearest 0.5 in US/UK/EU.

How should I measure foot length in centimeters?

Stand with weight on both feet, trace heel-to-longest-toe on paper, measure in cm. Use the longer foot. For men’s US 9 (~27 cm), a ruler reading of 26.5–27.5 cm may still fit depending on sock and toe box. Enter that cm value as “Foot length (cm)” — 27 cm input returns US 9, UK 8, EU 42.5 for men’s grading.

Do shoe widths (narrow, wide) matter?

Yes. This converter is length-only. A correct US 9 length in narrow (B) vs wide (EE) feels completely different. If EU 42.5 feels tight side-to-side, width—not length—is often the issue. Check the brand’s width chart (D, 2E, etc.) separately.

Does this include kids’ shoe sizes?

No—children’s and youth scales use different zero points and overlap rules (e.g., big-kid vs adult). A youth US 7 is not men’s US 7 (~27 cm). Use the manufacturer’s kids chart for school shoes and cleats.

Why is my Nike size different from my dress shoe size?

Athletic lasts are often roomier in the toe box; dress shoes may run narrow. The same ~27 cm foot might take US 9 in one running model and 9.5 or UK 8.5 in a leather oxford. Use this tool to shortlist, then order two adjacent sizes if returns are free.

Is this shoe size converter medical advice?

No—general adult sizing education only. Diabetic footwear, orthotics, and injury-related fitting need clinicians and certified pedorthists—not online MET-style length formulas.

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Sizing & fit

Shoe Size Converter — US, UK, EU, CM & Japan

Free shoe size converter for adult men’s and women’s footwear. Default: men’s US 9 → UK 8, EU 42.5, ~27 cm — plus US, UK, EU, and mondo inputs.

Last updated: May 25, 2026

Men’s US 9 → UK 8 · EU 42.5 · 27 cm · JP 27

Women’s US 8 → UK 6 · EU 38 · 24 cm

Start from cm for the most direct mondo conversion

Formal wear? Suit size calculator

Shoe size converter

US, UK, EU, foot length (cm), and Japan (cm/mondo-style)—approximate, not brand-specific

Gender sizing

Convert from

US shoe size

Half sizes are OK. Foot length is heel-to-toe standing (longer foot if they differ).

Converted sizes

42.5

JP (≈ cm)

Foot length (mondo-style)

27 cm

foot ≈ 27 cm (18 + US) → US 9, UK 8, EU 42.5, JP 27

Approximate conversion—brands and lasts differ. Always confirm with the manufacturer size chart before buying.
Measure foot length standing with weight on the foot; add socks if you wear them with the shoe.

Athletic vs dress lasts, wide/narrow widths, and kids' grading are not modeled here—use official charts for purchases.

Default snapshot (men’s US 9)

42.5

Foot (cm)

Formulas used

men's foot_cm ≈ 18 + US

women's foot_cm ≈ 16 + US

men's UK ≈ US − 1

women's UK ≈ US − 2

EU ≈ 1.5 × foot_cm + 2

JP (this tool) ≈ round(foot_cm) to whole cm

foot ≈ 27 cm (18 + US) → US 9, UK 8, EU 42.5, JP 27

Common size chart (this model)

Label	US	UK	EU	Foot (cm)
Men's US 8	8	7	41	26
Men's US 9	9	8	42.5	27
Men's US 10	10	9	44	28
Men's US 11	11	10	45.5	29
Women's US 7	7	5	36.5	23
Women's US 8	8	6	38	24
Women's US 9	9	7	39.5	25
Women's US 10	10	8	41	26

Precomputed from the same mondo formulas—confirm against your brand before purchase.

Worked scenarios

Default — men’s US 9

Common men’s retail size

US 9 · UK 8 · EU 42.5

27 cm · JP 27

foot ≈ 27 cm (18 + US) → US 9, UK 8, EU 42.5, JP 27

Women’s US 8

Typical women’s US label

US 8 · UK 6 · EU 38

24 cm · JP 24

foot ≈ 24 cm (16 + US) → US 8, UK 6, EU 38, JP 24

Men’s UK 8 input

Convert from UK sizing

US 9 · UK 8 · EU 42.5

27 cm · JP 27

foot ≈ 27 cm (18 + US) → US 9, UK 8, EU 42.5, JP 27

Women’s EU 38

Continental label → US/UK

US 8 · UK 6 · EU 38

24 cm · JP 24

foot ≈ 24 cm (16 + US) → US 8, UK 6, EU 38, JP 24

Foot length 27 cm

Mondo-style measurement (men’s)

US 9 · UK 8 · EU 42.5

27 cm · JP 27

foot ≈ 27 cm (18 + US) → US 9, UK 8, EU 42.5, JP 27

Men’s US 11

Larger running/training size

US 11 · UK 10 · EU 45.5

29 cm · JP 29

foot ≈ 29 cm (18 + US) → US 11, UK 10, EU 45.5, JP 29

Women’s US 10

Larger women’s US size

US 10 · UK 8 · EU 41

26 cm · JP 26

foot ≈ 26 cm (16 + US) → US 10, UK 8, EU 41, JP 26

Step-by-step: men’s US 9

foot_cm ≈ 18 + 9 = 27 cm
UK ≈ US − 1 → 8
EU ≈ 1.5 × 27 + 2 = 42.5
JP ≈ round(27) = 27

Women’s US 8 is not the same foot: 16 + 8 = 24 cm → UK 6, EU 38.

Limitations

Brand-specific lasts (Nike, Adidas, dress, skate) differ even at the same numeric label
Width letters (B, D, EE) are not modeled—length size alone can feel tight or loose
Children's and youth grading use different scales—not included here
Half sizes round to nearest 0.5 in US/UK/EU outputs; some retailers use whole EU only
Not for medical orthotics or custom footwear—clinical fitting goes beyond mondo formulas

References

Sizing estimates only. Always confirm with the manufacturer’s chart and return policy—especially for athletic and international orders.

Frequently Asked Questions

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Sizing & fit

Shoe Size Converter — US, UK, EU, CM & Japan

Free shoe size converter for adult men’s and women’s footwear. Default: men’s US 9 → UK 8, EU 42.5, ~27 cm — plus US, UK, EU, and mondo inputs.

Last updated: May 25, 2026

Men’s US 9 → UK 8 · EU 42.5 · 27 cm · JP 27

Women’s US 8 → UK 6 · EU 38 · 24 cm

Start from cm for the most direct mondo conversion

Formal wear? Suit size calculator

Shoe size converter

US, UK, EU, foot length (cm), and Japan (cm/mondo-style)—approximate, not brand-specific

Gender sizing

Convert from

US shoe size

Half sizes are OK. Foot length is heel-to-toe standing (longer foot if they differ).

Converted sizes

42.5

JP (≈ cm)

Foot length (mondo-style)

27 cm

foot ≈ 27 cm (18 + US) → US 9, UK 8, EU 42.5, JP 27

Approximate conversion—brands and lasts differ. Always confirm with the manufacturer size chart before buying.
Measure foot length standing with weight on the foot; add socks if you wear them with the shoe.

Athletic vs dress lasts, wide/narrow widths, and kids' grading are not modeled here—use official charts for purchases.

Default snapshot (men’s US 9)

42.5

Foot (cm)

Formulas used

men's foot_cm ≈ 18 + US

women's foot_cm ≈ 16 + US

men's UK ≈ US − 1

women's UK ≈ US − 2

EU ≈ 1.5 × foot_cm + 2

JP (this tool) ≈ round(foot_cm) to whole cm

foot ≈ 27 cm (18 + US) → US 9, UK 8, EU 42.5, JP 27

Common size chart (this model)

Label	US	UK	EU	Foot (cm)
Men's US 8	8	7	41	26
Men's US 9	9	8	42.5	27
Men's US 10	10	9	44	28
Men's US 11	11	10	45.5	29
Women's US 7	7	5	36.5	23
Women's US 8	8	6	38	24
Women's US 9	9	7	39.5	25
Women's US 10	10	8	41	26

Precomputed from the same mondo formulas—confirm against your brand before purchase.

Worked scenarios

Default — men’s US 9

Common men’s retail size

US 9 · UK 8 · EU 42.5

27 cm · JP 27

foot ≈ 27 cm (18 + US) → US 9, UK 8, EU 42.5, JP 27

Women’s US 8

Typical women’s US label

US 8 · UK 6 · EU 38

24 cm · JP 24

foot ≈ 24 cm (16 + US) → US 8, UK 6, EU 38, JP 24

Men’s UK 8 input

Convert from UK sizing

US 9 · UK 8 · EU 42.5

27 cm · JP 27

foot ≈ 27 cm (18 + US) → US 9, UK 8, EU 42.5, JP 27

Women’s EU 38

Continental label → US/UK

US 8 · UK 6 · EU 38

24 cm · JP 24

foot ≈ 24 cm (16 + US) → US 8, UK 6, EU 38, JP 24

Foot length 27 cm

Mondo-style measurement (men’s)

US 9 · UK 8 · EU 42.5

27 cm · JP 27

foot ≈ 27 cm (18 + US) → US 9, UK 8, EU 42.5, JP 27

Men’s US 11

Larger running/training size

US 11 · UK 10 · EU 45.5

29 cm · JP 29

foot ≈ 29 cm (18 + US) → US 11, UK 10, EU 45.5, JP 29

Women’s US 10

Larger women’s US size

US 10 · UK 8 · EU 41

26 cm · JP 26

foot ≈ 26 cm (16 + US) → US 10, UK 8, EU 41, JP 26

Step-by-step: men’s US 9

foot_cm ≈ 18 + 9 = 27 cm
UK ≈ US − 1 → 8
EU ≈ 1.5 × 27 + 2 = 42.5
JP ≈ round(27) = 27

Women’s US 8 is not the same foot: 16 + 8 = 24 cm → UK 6, EU 38.

Limitations

Brand-specific lasts (Nike, Adidas, dress, skate) differ even at the same numeric label
Width letters (B, D, EE) are not modeled—length size alone can feel tight or loose
Children's and youth grading use different scales—not included here
Half sizes round to nearest 0.5 in US/UK/EU outputs; some retailers use whole EU only
Not for medical orthotics or custom footwear—clinical fitting goes beyond mondo formulas