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Crampon Size Calculator

Find your correct crampon size based on your mountaineering boot mondo point size

Understanding Crampon Sizing

Crampon size is measured in whole numbers and corresponds to your boot's mondo point size. The general rule: if your mondo point is between sizes, round up. Crampons that are too small won't cover the toe properly; too large and they won't attach securely.

Crampon Size Chart

  • Mondo 35–36: Size 35–36 (≈ EU 36–37)
  • Mondo 37–38: Size 37–38 (≈ EU 38–39)
  • Mondo 39–40: Size 39–40 (≈ EU 40–41)
  • Mondo 41: Size 41 (≈ EU 41–42)
  • Mondo 42: Size 42 (≈ EU 42–43)
  • Mondo 43: Size 43 (≈ EU 43–44)
  • Mondo 44–45: Size 44–45 (≈ EU 44–46)
  • Mondo 46+: Size 46–48 (≈ EU 46–48)
💡 Pro TipWith semi-automatic and automatic crampons, the attachment system adds complexity to sizing. Always test your crampons with your actual boots before a climb — the toe bail or clip mechanism can shift effective size by half a mondo point.