Page "Catalysis" Paragraph 23

The SI derived unit for measuring the catalytic activity of a catalyst is the katal, which is moles per second.

The productivity of a catalyst can be described by the turn over number ( or TON ) and the catalytic activity by the turn over frequency ( TOF ), which is the TON per time unit.

The biochemical equivalent is the enzyme unit.

For more information on the efficiency of enzymatic catalysis, see the article on Enzymes.