Mondopoint ski boot size chart with US, UK and EU conversions

The printable version of the boot size calculator. Mondopoint is the one size in snow sports that cannot lie to you, because it is a statement of fact rather than a convention: a mondo 27.5 boot is built for a 27.5 cm foot, at every brand, in every country.

The conversion chart

The conversions to US, UK and EU are approximate by nature, because those scales are not standardised between manufacturers. Mondopoint is the definition and the rest are translations, so where a listing gives both and they disagree, believe the mondopoint number.

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How to measure your foot

Do it at the end of the day, when your feet are at their largest. Wear the sock you will actually ski in, which should be a thin ski sock and never a thick one. Stand against a wall with your heel touching it and your full weight on the foot, because a loaded foot is longer than an unloaded one by a few millimetres and those millimetres are half a size.

Mark the tip of the longest toe, which is not always the big toe, and measure from the wall to the mark in centimetres. Do both feet, because most people have one foot up to half a size longer, and you fit the larger. Then measure the width across the widest part of the forefoot, also loaded, which gives you the last recommendation below.

Last width, which matters more than length

Last is the width of the shell across the forefoot in millimetres, quoted at a reference size, usually mondo 26.5. A correctly sized boot in the wrong last is still the wrong boot, and no amount of buckling harder fixes it. Shop on last first, then flex, then price.

Two dimensions that never appear on a spec sheet decide as much as last does. Instep height is the most common reason a correctly sized boot feels tight across the top of the foot, and calf shape is the reason some people cannot close the top buckle on an otherwise perfect boot. Both are fixable by a bootfitter with a shell grind or a cuff adjustment, and neither is fixable by ordering a different size.

The shell fit, which is the only test that matters

Ask for a shell fit by name. It takes two minutes, it requires nothing but pulling the liner out, and it is the single most useful thing that happens in a boot fitting. It also cuts through the problem that a liner straight out of the box hides: new liner foam is thick and firm and makes almost any boot feel snug, and that feeling disappears within a week of skiing.

What packs out and what does not

Liners compress with use, typically by around half a size worth of volume in the first several days, and heat-mouldable liners accelerate that into one shop appointment. Shells do not pack out at all. That asymmetry is the whole argument for buying snug: the parts that will loosen are guaranteed to loosen, and the part that will not is the part that decides whether the boot can ever fit you.

It is also why an aftermarket footbed is worth buying at the same time. Stock insoles are flat foam that lets the foot spread and lengthen inside the shell under load, which both changes the effective fit and causes most of the forefoot pinching people blame on the boot.

Junior sizing and the annual problem

Children grow out of boots every year, which makes a seasonal lease programme the correct answer for junior boots almost every time. Most shops in ski towns run one and it typically costs a fraction of buying. Where you do buy, resist the urge to size up to grow into, because a boot two sizes too big teaches bad habits and makes a child cold, and cold children stop skiing.

Helmets are the item never to hand down at any age, because the liner works by crushing and you cannot tell by looking whether it has already done so.

Related

Convert your own measurement on the boot size calculator, read the boot fitting guide for what happens in the appointment, and check the flex index chart for what the other number on the box means. The ski boot roundup ranks the shelf by tier, and the build guides price the boot alongside everything else.