Shoe Size Converter

1. 01Measure your foot lengthStand on a sheet of paper, mark the back of your heel and the tip of your longest toe, then measure the distance in centimeters. Measuring in the afternoon or evening is more accurate, since feet swell slightly over the day.
2. 02Enter the foot lengthType the foot length in centimeters.
3. 03Read the sizes across systemsEU, US, and UK sizes for men's and women's shoes appear automatically, along with the next-nearest alternative size when your foot length falls between two table entries.

• Shopping from an overseas retailerInternational shopping sites often list only US or UK sizes. Convert to EU to compare against the shoes you normally wear.
• Buying shoes for someone elseIf you know someone's foot length (for example, from tracing it on paper), convert it to the size you need to buy without them trying shoes on in person.
• Double-checking a size before an online purchaseCompare the converted size against the specific brand's own size chart to reduce the risk of ordering the wrong size.

• 27 cm foot (men's)An exact table match: EU 42, US 9, UK 8.5 for men's shoes — no alternative, since it lines up exactly with one reference table entry.
• 25.4 cm foot (women's)An exact table match: EU 40, US 9, UK 7 for women's shoes.
• Between two table sizesIf your foot length falls between two reference table rows (for example, 27.1 cm for men), this tool shows the nearest real size (US 9) along with the next-nearest alternative (US 9.5) to try — not a fractional number calculated from a formula that doesn't actually exist in stores.

Shoe size systems (US, UK, EU) use different formulas and don't always translate 1:1 between each other, but foot length in centimeters is the same physical measurement everywhere. Starting from a direct foot measurement is more accurate than converting a size number from one system straight to another, which can compound rounding error.

This calculator uses two separate reference tables for men's and women's shoes, based on commonly published retailer size charts. Notably, these charts don't always give the exact same EU number for the same foot length between the men's and women's charts — this isn't an error in this tool, it reflects a real inconsistency in the shoe industry itself (women's shoe lasts differ from men's, and chart sources vary). That's why men's and women's results are shown separately rather than merged into one EU number.

ISO 19407:2023 is the international standard covering shoe sizing systems and provides conversion tables based primarily on foot length. Even that standard describes its cross-system conversions as guidance rather than an exact mathematical equivalence, since sizing systems developed independently and differ by brand, last shape, and region. This tool follows the same spirit: results are a practical, cross-checked reference, not a guarantee that every brand will fit identically at the size shown.

You enter foot length in centimeters. This tool shows EU, US, and UK sizes for men's and women's categories. Because shoe sizes are discrete reference-table values (steps of about 0.5 cm for men, 0.8-0.9 cm for women), this tool does not calculate a new fractional size between two table points — if your foot length falls exactly between two sizes, the nearest real size plus one next-nearest alternative are shown to try.

This reference table covers foot lengths of roughly 22-32 cm (approximately older-child through adult sizes) — outside that range, results are clamped to the table's boundary value and flagged as less accurate. This is not an official chart from any specific brand; real shoe sizes can differ by half a size or more depending on brand, model, and foot shape (width, instep height). For an important purchase, always check the specific brand's official size chart when available.

The calculation runs in your browser. The foot length you enter is never uploaded, stored, or shared, and closing the tab clears everything.

Is there one official international shoe size standard?

ISO 19407:2023 provides internationally recognized conversion guidance based on foot length, but even it treats cross-system conversions as guidance rather than an exact equivalence, since sizing systems developed differently across regions and brands.

Why are men's and women's results shown separately?

Because the men's and women's reference charts used here don't always give the exact same EU number for the same foot length — this is a real inconsistency in the shoe industry, not a calculation error.

Why does it sometimes show two sizes (like "9 or 9.5")?

Because your foot length falls between two real sizes in the reference table. Shoe sizes are discrete values, not a number that can be freely subdivided, so this tool shows the nearest real size plus one next-nearest alternative to try, rather than a calculated number that doesn't actually exist on a shelf.

How accurate is this conversion?

This is a general reference based on commonly published retailer and manufacturer size charts, using real sizes from the table rather than mathematically rounded numbers. Actual fit still varies by brand and model, so treat this as a starting point, not a certainty — check the specific brand's official chart when available.

How do I measure foot length correctly?

Stand on a sheet of paper with your weight evenly distributed, mark the back of your heel and the tip of your longest toe, then measure the distance with a ruler in centimeters. Measure both feet, since they can differ slightly, and use the longer measurement.

Is my data saved?

No. Everything is calculated in your browser; nothing is sent to a server.