Try
=IF(N(A1),"",LEFT(A1,1))&IF(N(A1),A1/1000,MID(A1,2,99)/1000)

--
Jacob


"rlihle1" wrote:

Need a formula to change values from parts per billion to parts per million,
but need to have formula to check for "less than" and complete conversion.

51 would be 0.051
<5 would be <0.005
THANKS