Hello Fingerjob,

Sorry but I cannot agree he

1. Can we be sure that the OP wanted what we produced?

2. If yes: Which approach does the OP understand (better)?

3. Ok, your formula does not use a helper column but: It takes about
250 times more calculation time than my two formulas (tested with
FastExcel on 10,000 rows). In these cases I like to call the slower
approach a "runtime crime" :-)

SCNR,
Bernd