Catheter Size Information
Conversion in FR/mm/inch (Outer Diameter)

FR 12 14 16 18 20 22 24 26
mm 4 4.7 5.3 6 6.7 7.4 8 8.7
inch 0.16 0.185 0.21 0.24 0.265 0.295 0.32 0.345

FR 28 30 32 34 36 38 40 42 48
mm 9.4 10 10.7 11.3 12 12.7 13.4 14 16
inch 0.375 0.4 0.425 0.455 0.48 0.5 0.53 0.55 0.64