=LOOKUP(A1,{0,"F";0.6,"D";0.7,"C";0.8,"B";0.9,"A"} )

--

HTH

RP
(remove nothere from the email address if mailing direct)


"Curt R." wrote in message
...
.9 = A
.8 to .89 = B
.7 to .79 = C
.6 to .69 = D
<.6 = F