Football Boot Size Guide (UK / EU / US / CM) – Do Boots Run True to Size? (2026)

Most football boots run about half a size smaller and narrower than everyday trainers. Order your usual size as a starting point, then adjust by material: leather boots stretch, so buy them snug; synthetic speed boots hold their shape, so size down half a size for a locked fit. Below is the full UK/EU/US/cm chart plus the junior trap that causes most returns. (US shoppers: these are ‘soccer cleat’ sizes.)

What is the football boot size conversion (UK / EU / US / cm)?

Use UK as the anchor – it is the football-trade standard – then read across. Brand offsets vary slightly, so always confirm against the specific boot’s chart before you order.

Do boots run true to size for every brand?

Not quite – fit changes with the brand and the upper. Nike Mercurial and Phantom, adidas F50 and Puma Ultra are cut narrow and snug, so most players take their true size or drop half a size. Leather boots such as Nike Tiempo, adidas Copa, Puma King and Mizuno Morelia mould and stretch, so buy them snug and let them break in. Mizuno and New Balance generally run wider, which makes them a good starting point for broader feet.

What size boot should I buy for wide feet?

Choose a leather boot that stretches and moulds – adidas Copa, Nike Tiempo, Puma King or a Mizuno – and avoid ultra-tight speed synthetics. Sizing up half a size also helps, and leather breaks in to your foot within a few sessions.

Why is junior sizing so confusing?

Because junior boots reuse the same UK numbers as adults on a smaller scale, topping out around UK 5.5, while adult sizing starts at UK 6. A ‘UK 3 Junior’ fits a child; a ‘UK 3 adult’ does not exist in most ranges. Junior boots are also lighter, narrower and usually sold only in FG, AG, MG or TF. Always pick the correct size GROUP first – it prevents almost every sizing return.

Ready to order?

Every pair in our football boots store lists UK, EU, US and cm on each size, so you can pick with confidence – and if you’re between sizes, follow the leather-up / synthetic-down rule above. Fast worldwide shipping on all sizes.