Lorazepam is 1/2 the strength of Xanax and Klonopin, i.e. 10x the strength of Valium. It has a short half-life, just a little longer than that of Xanax... a good bit shorter than Klonopin.

here is a table for conversion:

Link: benzo.uk.org -- BENZODIAZEPINE EQUIVALENCE TABLE

Please remember, however, that each benzo has it's own specific profile wrt the 5 basic benzo properties, so subbing one for another is not a clean mathematical equation; one must consider each case and the sx to be treated. the 5 basic properties that all benzo's have, to differing degrees, are:

-- anxiolytic (antianxiety)
-- hypnotic (sedative)
-- anticonvulsant (prevent and/or stop seizures)
-- amnestic (cause amnesia)
-- myorelaxant (relax the muscles)

~ waves ~