What Size Ski Boot Do I Need?
Ski Boot Size Chart and Fit Guide
Most people who come into the shop convinced they know their ski boot size are wrong by half a size or more. It's the single most common mistake we see, and it almost always goes the same direction: too big. Ski boots are sized to your actual foot length in centimeters, not to the sneaker size you're used to buying. Get that number right and everything else about your day on the hill gets easier. Below is a chart for men, women, and kids, plus the same shell-fit test our fitters use at the bench.
- Ski boots use Mondopoint sizing, which is just your foot length in centimeters.
- Measure your foot at home before you trust any street-shoe conversion.
- A properly sized boot feels snug on day one, because the liner packs out about half a size.
- Kids sizing labels vary by brand, so go by the measured centimeters, not the US number.
How Do You Find Your Mondopoint Size?
Mondopoint is your foot length in centimeters, and it's the one number every boot brand actually shares. A Mondo 27 boot is built for a 27 cm foot, full stop. To measure at home: put on the thin sock you'll ski in, stand with your heel against a wall with your full weight on the foot, and mark the paper at your longest toe. Measure heel to mark in centimeters. Do both feet and use the bigger one, and measure late in the day when your feet have swelled.
That centimeter number is your starting size. Half sizes in Mondopoint don't add length. A 26.0 and a 26.5 share the exact same shell, and the exact same liner. Companies used to change the volume of a half size by altering the thickness of the footbed. They no longer do even that — everything is now rated at the half (26.5, 27.5, 28.5, and so on).
Short cuff (SC) and women's boots
Many boots now have women's-specific cuffs that are a little larger in circumference, but the industry standard for years has been to downsize the upper cuff so it sits higher on a shorter calf. If a men's or unisex boot came in with a 26.5 lower shell and a 26.5 upper cuff, the same 26.5 boot in a short-cuff or women's model would normally have a 25.5 upper cuff.
The measured foot beats a chart every time, which is why we still put every customer's foot on the sizer before we pull a single boot off the wall.
Ski Boot Size Charts: Men, Women, and Kids
Here's the conversion for measured-foot sizing. Advanced and expert skiers often drop half a size to a full size below these numbers for a tighter, more responsive fit. Use the chart to get in the ballpark, then confirm with the shell test in the next section.
Men's Ski Boot Sizes
| US Men's | Mondopoint (cm) | UK | EU |
|---|---|---|---|
| 5 | 23.5 | 4 | 36.5 |
| 6 | 24.5 | 5 | 38 |
| 7 | 25.5 | 6 | 39 |
| 8 | 26.5 | 7 | 41 |
| 9 | 27.5 | 8 | 42 |
| 10 | 28.5 | 9 | 43 |
| 11 | 29.5 | 10 | 44.5 |
| 12 | 30.5 | 11 | 45.5 |
| 13 | 31.5 | 12 | 47 |
Quick rule: US Men's + 18 ≈ Mondopoint. A US 10 lands at Mondo 28.
Women's Ski Boot Sizes
| US Women's | Mondopoint (cm) | UK | EU |
|---|---|---|---|
| 5 | 21.5 | 2 | 34 |
| 6 | 22.5 | 3.5 | 36 |
| 7 | 23.5 | 4.5 | 37 |
| 8 | 24.5 | 5.5 | 38.5 |
| 9 | 25.5 | 6.5 | 40 |
| 10 | 26.5 | 7.5 | 41 |
| 11 | 27.5 | 8.5 | 42.5 |
| 12 | 28.5 | 9.5 | 44 |
Quick rule: US Women's + 16.5 ≈ Mondopoint. Sources vary by about half a size here, so lean on your measured foot.
Kids and Youth Ski Boot Sizes
Kids US labels are all over the place between brands, so this chart leads with the centimeters and EU size. Measure the foot and trust the Mondo number.
| Mondopoint (cm) | US Kids | EU |
|---|---|---|
| 15.5 | 8–9 C | 25 |
| 16.5 | 10 C | 26 |
| 17.5 | 11 C | 27 |
| 18.5 | 12 C | 29 |
| 19.5 | 13 C | 30.5 |
| 20.5 | 1 Y | 31–32 |
| 21.5 | 2.5 Y | 33.5 |
| 22.5 | 3.5 Y | 34.5 |
| 23.5 | 4.5 Y | 36 |
| 24.5 | 6 Y | 38 |
The Shell Fit Test, and Why Snug Is Right
The real length test skips the box number entirely. Pull the liner out of the shell, put your foot in the empty plastic, and slide forward until your toes touch the front. Now measure the gap behind your heel in centimeters (fitters used to call this a "finger" or "two fingers," but everyone's fingers are a different size, so the actual measurement is what matters). How much space you want depends on how you ski.
| Skier level | Space behind heel | Feel |
|---|---|---|
| Racer / expert | 0.5–1.5 cm | Tightest, most direct, least forgiving |
| Advanced / performance | 1–1.5 cm | Precise and responsive |
| Intermediate | 1.5–2 cm | Balanced fit for most skiers |
| Beginner / recreational | ~2 cm | Roomier, warmer, more comfortable |
More than 2 cm and the boot is too big. It'll feel fine in the shop and turn sloppy once the liner packs out. The tighter you go, the more the ski reacts to your foot, and the less comfort and warmth you get in return. That's the whole trade-off in one line.
The liner does part of this job too. Race boots run a thin, dense liner so your foot sits right up against the plastic and your energy goes straight into the ski. Recreational boots use a thicker, softer liner with more padding, which is warmer and comfier but cushions some of that transfer. That's why a race fit is both shorter and thinner-linered — it's not just a smaller shell, it's less material between your foot and the ski. Two skiers with the same foot can end up a full size apart depending on how much they want the boot to talk to the ski.
Here's the trade-off nobody likes hearing: a boot that feels great in the store is usually too big. Every liner packs out and compresses over the first five to ten ski days, opening up about half a size of room. So a boot that fits snug but not painful on day one is the one that'll fit right all season. We'd rather send you home in a boot that feels honest than one that feels cozy in July and swims by January. If a pressure point shows up after break-in, we can punch or grind the shell to fix it. Fit and stiffness go hand in hand, and our in-person boot fitting is the fastest way to nail both.
Ski Boot Sizing FAQ
Should ski boots feel tight? Snug, not painful. A good fit feels like a solid handshake. Standing tall, your toes lightly brush the front; flex into a ski stance and they pull just off the front while your heel stays locked down.
Do ski boots stretch out? The liner packs out; the plastic shell doesn't stretch on its own. Expect the liner to compress and mold over the first five to ten days, which is why you start snug. A fitter can punch or heat-mold the shell for specific spots.
My kid's feet are growing, should I size up? Absolutely not, for a few reasons. A properly fitting boot is the most important piece of a skier's equipment, and that's even more true for kids, where a centimeter of extra length is a much bigger share of a small foot than an adult's. Picture walking around in swim flippers — that's what a child feels in boots two sizes too big. It's also unsafe: the foot slides, the heel lifts, and steering gets hard. And you don't need to oversize to save money. Willi's junior buy-back program guarantees the size fit for the first year, so if your child outgrows the boots in a growth spurt we exchange them at no charge. In year two we buy them back for 50% of the original value, and 25% in year three. And if your child is five or under, our five-and-under program is the best value in the industry: we buy the boots back for 100% in the second year.
The boot size is smaller than my normal shoe, is that wrong? No, that's expected. Street shoes usually run bigger than your actual foot. Trust the measured centimeters.
Come Get Fitted
A chart gets you close. A real fitting gets you right. Willi's has been fitting ski boots since 1970, and boot fitting is what we're known for. Bring your feet to any of our locations and we'll measure you, run the shell test, and match you to a boot that fits the way it should.
Not sure where to start? Browse our ski boots collection or read our Choosing the Right Ski Boots guide first.