Are CM, JP and Korean shoe sizes always identical?

They often refer to a millimeter or centimeter length label, but a product label may not equal your measured foot length. Check the brand's chart definition.

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International Shoe Size Converter & Brand Chart

Q: Is there one exact formula for converting every shoe size?

No. Brand charts use different intervals and labeling, so the most reliable starting point is your foot length and the chart for the exact brand and product.

Q: Should I measure both feet?

Yes. Measure both feet while standing and begin with the longer foot, then check the product's width and fit guidance.

Compare adult US men's, US women's, UK, EU and centimeter size labels against current published charts from Nike, adidas and New Balance. Measure both feet or start with a known label, then inspect the neighboring chart rows before ordering.

Brand-chart data reviewed September 14, 2026.

Nearest listed size

Brand chart—

Difference between feet—

Chart length—

US men's—

US women's—

UK—

EU—

—

Same foot length across all three charts

Brand	Listed length	US men's	US women's	UK	EU

Why a brand chart is better than one universal formula

International shoe-size conversion is not a single piece of arithmetic. A familiar shortcut such as “subtract one size” can land between actual rows, and the gap changes across brands and parts of the chart. EU charts may use whole numbers, half steps or thirds. US women's and men's labels can have different offsets. Even two products carrying the same label can feel different because the last, upper, lining and intended activity are different.

This tool therefore performs a nearest-row lookup in a selected brand's published adult footwear chart. It does not invent a smooth conversion formula. When you enter foot length, it finds the closest listed length row. When you enter a known size, it finds that size in the selected chart and exposes the other labels printed on the same row. The comparison table then shows the nearest row for the same length in all three profiles, making disagreement visible instead of hiding it.

A nearest row is only a starting point. Before buying, open the exact product page, check whether that model runs small or large, review width options and confirm the retailer's return terms. This page does not guarantee fit or savings.

What the systems mean

Label	Useful interpretation
US men's	A category-specific label; not a direct foot-length measurement.
US women's	A separate US label sequence, usually higher than the men's label on the same brand row.
UK	A UK label sequence that is close to, but not interchangeable with, US men's sizing.
EU	A European label. Brands may publish whole sizes, half sizes or one-third steps.
CM / JP / KR	Often a length-oriented label, but the number printed on a box may differ from measured foot length.

ISO 19407:2023 describes comparison tables among major sizing systems using foot length as the logical starting point. ISO 9407:2019 defines the Mondopoint system using foot dimensions. Those standards explain why a real measurement is more useful than assuming identical labels, but the brand's product chart still controls the practical lookup.

How to measure both feet

Measure late in the day, when feet may be slightly larger, on the type of surface where you can stand naturally.
Wear the socks or hosiery you expect to use with the shoe.
Place paper against a wall, stand with your heel lightly touching the wall and keep your weight on the measured foot.
Mark the end of the longest toe. Measure from the wall edge to that mark in centimeters.
Repeat for the other foot and enter both numbers. This tool begins with the longer measurement.
If you are between listed rows, inspect both adjacent rows and the product's own fit guidance.

Do not add an arbitrary allowance unless the brand tells you to. Some brand charts ask for actual foot length and already map it to an appropriate shoe label; others display a product length label. Adding space twice can produce an oversized result.

Length is only one part of fit

A length conversion cannot account for width, foot volume, arch shape, toe-box geometry or heel hold. New Balance, for example, publishes multiple width choices for many styles. Athletic shoes, dress shoes, hiking boots and children's footwear also use different fit assumptions. This calculator is limited to the adult unisex or adult footwear rows represented in the cited charts; it is not a children's-size, width or medical-fitting tool.

For online shopping, check five things together: measured length, the exact model's chart, available width, recent fit notes from the seller and return conditions. If one foot is materially longer, wider or painful, use the longer foot as the initial length reference and seek qualified in-person fitting advice when needed. A number on a chart is not a diagnosis.

Why neighboring rows are shown

Rounding a 26.2 cm measurement to a single “perfect” size creates false precision. Brand rows are discrete, and a measurement can sit between them. The tool lists the row immediately below and above the match so you can compare the practical options. Consider sock thickness and the intended activity, but do not automatically size up; follow the product guidance.

Using a known size

Choose “A known labeled size” when you own a well-fitting shoe from one of the included brands. Select the system printed on its label and enter the number. The tool locates the nearest row in that same brand chart. This is useful when a retailer presents a different regional label, but it does not prove that another model has the same internal shape.

EU third sizes can be entered as decimals: approximately .33 for one-third and .67 for two-thirds. The displayed result preserves the brand's familiar fraction. If your entry is not an exact row, the match note reports the difference rather than pretending it was exact.

Common conversion mistakes

Mixing a US women's label with the US men's column.
Treating a box's CM label as guaranteed measured foot length.
Using one brand's row as an exact promise for another brand.
Measuring only one foot or measuring while seated.
Ignoring width and product-specific fit guidance.
Rounding silently when the input falls between chart rows.
Assuming children's and adult charts follow the same sequence.

What to do when brand charts disagree

Differences in the comparison table are expected, not a software error. Each brand assigns its own regional labels to length intervals, so the same measured foot can point to different EU or UK numbers. Keep the measurement constant and treat each brand's row independently. Do not average two labels or carry one brand's EU number into another brand's checkout without checking that second chart.

For a first purchase from an unfamiliar brand, save the measurement, the selected chart row and the adjacent rows. Then compare those with the exact model's description and return policy. If the seller offers a model-specific chart, it should take priority over a general brand chart. If the seller only supplies an unlabeled conversion table, look for whether “CM” means foot length, recommended shoe length or the number printed on the product label.

After trying the shoe indoors, check heel movement, toe space, forefoot pressure and comfort with the intended socks. Preserve packaging until you decide. This practical check matters more than forcing every regional label to agree, and it reduces the chance of keeping a poor fit merely because the converted number looked familiar.

Method and official sources

The three profiles are transcribed as row-by-row adult chart lookups rather than blended into a proprietary scale. For Nike, the tool converts the published Foot Length values from inches to centimeters and does not substitute Nike's separate CM/JP box label. We reviewed the source pages on September 14, 2026. Brand pages can change, so verify the current chart at purchase time:

Nike men's footwear size chart and Nike foot-measuring guide.
adidas shoes size chart.
New Balance size and width guide, including length and width tables.
ISO 19407:2023 footwear sizing conversion and ISO 9407:2019 Mondopoint sizing.

Independent disclosure: This comparison has no paid placement and currently contains no affiliate links. Brand names identify the factual chart source only. TrendPromptLab is not affiliated with or endorsed by Nike, adidas, New Balance or ISO.

Frequently asked questions

Is there one exact formula for converting every shoe size?

No. Real brand charts contain different steps and offsets. Use a brand row and the exact product chart instead of relying on a universal formula.

Should I measure both feet?

Yes. Feet commonly differ. This tool uses the longer measurement for its initial row lookup and displays the difference so it is not overlooked.

Are CM, JP and Korean labels always identical?

They are often length-oriented, but a printed CM or JP value may be a size label rather than your literal foot length. Nike explicitly distinguishes its CM label from the separate Foot Length column. Read the chart heading carefully.

Can this tool choose width or guarantee fit?

No. It compares length rows only. Width, volume, materials and shoe shape require product-specific information and, when necessary, an in-person fitting.