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Corn Size Classification

Corm sizes are approximately the following diameters:

In USA In Europe (Holland) In Russia
Group Corm diameter Group Corm diameter Group Corm diameter
Extra 2” / 5,1 cm
or larger
Extra 6.3” / 16 cm
or larger
1 1.18” / 3,2 cm
or larger
1 1”-2” / 3,8-
5,1 cm
Large 3.9”-6.2” /
10-16 cm
2 0.79”-1.18” /
2,5-3,2 cm
2 1.25”-1.5” / 
3,2-3,7 cm
Medium 2.4”-3.9” / 
6-10 cm
3 0.4”-0.79” /
1,5-2,5 cm
3 1”-1.25” / 
2,5-3,2 cm
Small 1.8”-2.4” / 
4-6 cm
4 0.3”-0.4” / 
1-1,5 cm
4 0.75”-1” / 
1,9-2,5 cm
       
5 0.5”-0.75” /
1,3-1,9 cm
       
6 under 0.5” /
1,3 cm
       
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