There is no method of conversion or comparison between Brinell hardness numbers which are obtained by different steel ball and different load respectively but they satisfying a special condition. In this report, using relations obtained in the former report, the relation to convert between Brinell hardness numbers obtained in all conditions was introduced, which was testified by previous experimental results. To convert the hardness number H
1 (the depth of indentation is h
1) or H
1' (the depth of indentation h
1') obtained by a steel ball of radius R
1 and load P
1 and P
1' respectively, to the hardness number H
2 which will be obtained with a steel ball of radius R
2 and load P
2, the conversion equation was given as following : where, [numerical formula]
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