Kids Ski Boot Size Chart & Mondopoint Calculator
Convert everyday US sneaker sizes to ski boot Mondopoint. Avoid painful shin bang, cold toes, and oversized rental mistakes.
Direct Answer: How Kids Ski Boot Sizing Works
Children's ski boots are sized using the Mondopoint system, which corresponds to the child's exact foot length in centimeters. For example, a child with an 18.5 cm foot wears a Mondopoint 18.5 (equivalent to US Kids 12C / EU 30). For recreational junior skiers, allow a maximum comfort buffer of 1.0 cm to 1.5 cm beyond bare foot length; anything greater will compromise ankle stability and control.
Interactive Ski Boot Sizer
Enter foot length or select your child's sneaker size
Built for a foot measuring roughly 17.5 cm with recreational skiing clearance. Requires a single medium-weight ski sock.
Official Kids Ski Boot Conversion Chart
Mondopoint (Mondo) measurements correspond to foot length in centimeters. Always fit based on the larger foot.
| Foot Length (cm) | Mondopoint | US Kids | UK Kids | EU Size | Average Age |
|---|---|---|---|---|---|
| 14.5 cm (5.71") | 14.5 | 8C | 7.5 | 24 | 2–3 Years |
| 15.5 cm (6.10") | 15.5 | 9C | 8.5 | 25.5 | 3–4 Years |
| 16.5 cm (6.50") | 16.5 | 10C | 9.5 | 27 | 4–5 Years |
| 17.5 cm (6.89") | 17.5 | 11C | 10.5 | 28.5 | 5–6 Years |
| 18.5 cm (7.28") | 18.5 | 12C | 11.5 | 30 | 6–7 Years |
| 19.5 cm (7.68") | 19.5 | 13C | 12.5 | 31 | 7–8 Years |
| 20.5 cm (8.07") | 20.5 | 1Y | 13.5 | 32.5 | 8–9 Years |
| 21.5 cm (8.46") | 21.5 | 2Y | 1.5 | 34 | 9–10 Years |
| 22.5 cm (8.86") | 22.5 | 3Y | 2.5 | 35 | 10–11 Years |
| 23.5 cm (9.25") | 23.5 | 4.5Y | 4 | 36.5 | 11–12 Years |
| 24.5 cm (9.65") | 24.5 | 6Y | 5.5 | 38.5 | 12+ Years |
The 3 Golden Rules of Fitting Children's Ski Boots
The Shell Fit Test
Take out the liner. Have child stand in the plastic shell with toes touching front. Check space behind heel: 15–20 mm (1–2 fingers) is ideal.
One Sock Only
Never put two pairs of socks on a child in ski boots. It restricts capillary blood flow, causing icy cold toes and painful cramping.
Buckle From Top Down
Fasten the power strap and upper cuff buckles first. This draws the child's heel backward into the heel pocket before securing toe buckles.
Frequently Asked Questions: Kids Ski Boots
Helpful fit allowances, measuring wisdom, and sizing advice for parents.
What is Mondopoint in children's ski boots?
Mondopoint is the universal ski industry standard measuring the internal length of the boot in centimeters. A Mondopoint size 18.5 means the boot is built for a foot measuring approximately 18.5 cm (US Kids Size 12C / EU 30).
Should I buy ski boots a size bigger for growth room?
Never buy ski boots more than one Mondopoint size (roughly 1 cm) larger than your child's measured foot length. Oversized boots cause the foot to slide forward, smashing toes into the front wall and causing heel slippage, shin bang, and cold feet due to lack of control.
Should kids wear two pairs of socks in ski boots?
No! Double socking restricts capillary blood circulation, trapping sweat and making children's feet freezing cold. Use a single pair of dedicated, over-the-calf merino wool or synthetic ski socks with flat toe seams.
What is the ski boot shell fit test for children?
Remove the soft foam liner from the plastic shell. Have your child slide their bare foot inside the plastic shell until their toes touch the front wall. Look down behind their heel: you should be able to slide one to two adult fingers (15 mm to 20 mm) between their heel and the back wall for a proper recreational fit.
Do ski boot half sizes have larger plastic shells?
Most ski boot manufacturers share the exact same plastic shell for whole and half sizes (e.g., size 19.0 and 19.5 share the same outer shell). The half size is typically adjusted by using a thicker or thinner internal footbed.