<PAGE>
BHA Group Holdings, Inc.
Computation of Earnings Per Common Share
<TABLE>
<CAPTION>
(In thousands, except per share data)
For the three months ended
June 30, 2000 June 30, 1999
------------------------------------------ -------------------------------------------
Net Earnings Shares Per-Share Net Earnings Shares Per-Share
(Numerator) (Denom.) Amt. (Numerator) (Denom.) Amt.
----------- -------- ---- ----------- -------- ----
<S> <C> <C> <C> <C> <C> <C>
Basic earnings per share:
Earnings available to common
shareholders $ 1,324 6,520 $ 0.20 $ 597 6,993 $ 0.09
Effect of dilutive
securities--stock options -- 72 -- 46
Diluted earnings per share:
Earnings available to common
shareholders and assumed
conversion $ 1,324 6,592 $ 0.20 $ 597 7,039 $ 0.08
========================================== ===========================================
<CAPTION>
(In thousands, except per share data)
For the nine months ended
June 30, 2000 June 30, 1999
------------------------------------------ -------------------------------------------
Net Earnings Shares Per-Share Net Earnings Shares Per-Share
(Numerator) (Denom.) Amt. (Numerator) (Denom.) Amt.
----------- -------- ---- ----------- -------- ----
<S> <C> <C> <C> <C> <C> <C>
Basic earnings per share:
Earnings available to common
shareholders $ 4,562 6,630 $ 0.69 $ 1,757 7,052 $ 0.25
Effect of dilutive
securities--stock options -- 57 -- 117
Diluted earnings per share:
Earnings available to common
shareholders and assumed
conversion $ 4,562 6,687 $ 0.68 $ 1,757 7,169 $ 0.25
========================================== ===========================================
</TABLE>
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