Football Boot Size Guide: How to Get the Right Fit (AU Charts)
An AFC and FFA licensed coach with 30+ years on Australian grounds shows you how to size football boots the simple way.
Most players and parents buy football boots by guessing off a street shoe size, then wonder why the toes hurt or the heel slips. After 30 years coaching juniors and seniors across Australian grounds, I can tell you the fix is almost always sizing, not the brand. A boot that fits snug puts your foot right over the studs and gives you a clean touch on the ball. This guide shows you how to measure once, convert across AU, US, UK and EU sizing, and get a growing kid into the right boot without buying two sizes up. Once you know your size, the picks in our guide to the best soccer boots in Australia are easy to shop.
Why your boot size is not your street shoe size
Before any chart, understand why football boots run different to your everyday shoes. Boots are built to fit snug so your foot sits directly over the studs with no sliding, which is what gives you grip and a clean strike. A casual shoe leaves a thumb of space at the toe; a boot leaves almost none, just enough that your longest toe brushes the end without curling. That is why most players take a half-size down from their street shoe in a firm-ground boot. Knit and sock-style boots stretch in a little with wear, so they can start even snugger. The goal is a locked-in heel and a toe that grazes the end, not a gap you can wiggle into.
Step 1: Measure your foot at home
Stand on a sheet of paper with your heel against a wall, weight on the foot, and mark the tip of your longest toe. Measure from the wall to the mark in centimetres, and do both feet, because one is usually a touch longer. Use the bigger number. Measure late in the day when the foot is at its fullest, and wear the socks you play in. That single centimetre figure is what every brand chart converts to a size, so getting it right here saves you guessing later.
Step 2: Match your measurement to a size
Use the chart below to turn your foot length into a starting size across the sizing systems you will see on Australian shelves and international sites. AU and UK boot sizes are effectively the same, US runs about one size higher, and EU is the centimetre-based system most brands print inside the boot. Find your foot length, read across, then confirm with the fit check in step three.
| Foot length | AU / UK | US (men) | EU | Typical fit |
|---|---|---|---|---|
| 21.5 cm | 2 | 3 | 34 to 35 | Junior (8 to 9) |
| 22.5 cm | 3 | 4 | 35 to 36 | Junior (10 to 11) |
| 23.5 cm | 4 | 5 | 37 | Youth (11 to 12) |
| 24.0 cm | 5 | 6 | 38 | Youth (12 to 13) |
| 25.0 cm | 6 | 7 | 39 | Teen to adult |
| 25.5 cm | 7 | 8 | 40 to 41 | Adult |
| 26.5 cm | 8 | 9 | 42 | Adult |
| 27.5 cm | 9 | 10 | 43 to 44 | Adult |
| 28.5 cm | 10 | 11 | 44 to 45 | Adult |
| 29.5 cm | 11 | 12 | 46 | Adult |
Step 3: Check the fit on the foot
Lace the boot fully, stand up, and walk a few steps. Your longest toe should just brush the end with a thumbnail of space, no more. The heel should lock in with no slip when you push off, and the midfoot should feel snug across the laces without pinching. Do a few quick toe-taps and a short jog on the spot. If your toes curl or the front feels tight under load, go up a half-size. If your heel lifts or your foot slides forward, go down. Remember knit uppers give a little, leather moulds to the foot over a week or two, and synthetic stays close to its out-of-box fit.
Brand-by-brand fit: Nike, adidas, Puma, New Balance, Asics and Mizuno
The same labelled size fits differently across brands, so it pays to know the patterns. Nike tends to cut narrow, especially the Mercurial and Phantom lines, so wide feet often size up or look elsewhere. adidas sits medium to slightly wide, with the Copa and leather Predator roomier than the speed boots. Puma runs fairly standard, a safe medium width. New Balance, through the Furon and Tekela lines, comes in genuinely wide options, which is gold for broad feet. Asics, with its Japanese Lethal and DS Light heritage, suits narrow to medium feet and a snug midfoot. Mizuno Morelia leather is narrow out of the box but moulds beautifully with wear. Treat your charted size as the starting point, then nudge for the brand.
Sizing kids’ football boots and how much room to leave
Junior sizing is where the money gets wasted, because kids grow between seasons and the temptation is to buy big and hope it lasts. Leave a thumb-width of growing room at the toe, around a centimetre, and no more. A boot two sizes up rolls under the ankle, kills the touch on the ball, and is a genuine injury risk on a quick turn. Re-measure at the start of every season rather than assuming last year’s size still fits, and check mid-season for fast growers. If you are buying for a junior, our pick list for the best kids football boots flags the models that hold up and the sizes that run true.
Once you have your size locked in, see how this year’s options compare in our full football boots hub, or work through the complete soccer boots buying guide for picks by surface, position and budget.
Football Boot Sizing FAQs
What size football boots should I buy compared to my normal shoes?
Most players take a half-size down from their everyday shoe, because football boots are built to fit snug with your foot right over the studs. Measure your foot in centimetres and match it to a chart rather than copying your street size straight across, since boots and casual shoes are cut differently.
Should football boots be tight or loose?
Snug, not loose. Your longest toe should just brush the end with about a thumbnail of space, and your heel should lock in with no slip. A loose boot lets the foot slide, which costs you grip and touch and can cause blisters. Knit and leather boots give a little with wear, so start them snug.
How much growing room should I leave in kids' football boots?
About a thumb-width, roughly one centimetre, at the toe. No more. A boot two sizes up rolls under the ankle, ruins the touch, and is an injury risk. Re-measure every season instead of buying big to last.
Are Nike and adidas football boots the same size?
Close but not identical. Nike tends to cut narrow, especially the Mercurial and Phantom, while adidas sits medium to slightly wide, with the Copa and leather Predator roomier. Use your charted size as a start, then adjust for the brand’s known width.
How do I convert UK football boot sizes to Australian sizes?
AU and UK football boot sizes are effectively the same number, so a UK 8 is an AU 8. US sizing runs about one size higher, and EU is the centimetre-based system printed inside most boots. The chart above lines all four up against foot length.
Do football boots stretch over time?
Leather boots stretch and mould noticeably to the foot over a week or two of wear, knit uppers give a little, and synthetic stays close to its out-of-box fit. If a leather boot feels just-snug when new, it will likely ease into a perfect fit. If it pinches hard anywhere, it is too small.
