Ski Boot Size Calculator
Find ski boot mondo size from foot length in cm or inches.
Returns flex index from 60 to 130 based on weight, skiing ability, and terrain preference.
Ski Boot Recommendation
How Ski Boot Size Is Calculated
Ski boots use the Mondopoint system — a measurement in millimeters of the foot’s actual length. This is different from US, UK, or EU shoe sizes.
Mondopoint Formula:
Mondo Size = Foot Length in mm ÷ 10
US to Mondo Conversions (approximate):
- US Men’s 7 → Mondo 25.0
- US Men’s 9 → Mondo 27.0
- US Men’s 11 → Mondo 29.0
- US Women’s 7 → Mondo 24.0
- US Women’s 9 → Mondo 26.0
How to Measure Your Foot:
- Stand on a piece of paper with weight fully on that foot
- Trace your foot outline
- Measure the longest distance from heel to longest toe (in mm)
- Divide by 10 — that is your Mondo size
Worked Example: Foot length measures 278 mm.
- Mondo size = 278 ÷ 10 = 27.8 → fits a 28.0 boot
Fit Tips:
- Ski boots should feel snug — toes barely touching the front when standing upright
- When you flex forward into skiing position, toes should pull back and feel comfortable
- Last width matters: narrow feet → 95–98mm last; average → 100–102mm; wide → 103–106mm
- Boot flex index: 60–80 for beginners, 80–100 intermediate, 100–130 advanced, 130+ expert/race
- Heat-moldable liners and shells reduce break-in time from weeks to minutes
- Always measure both feet and fit to the larger one