I am a supporter of St. Joseph's hospice. If you find this site useful or if it helped you, consider a small donation to St. Joseph's, please.

Information on
St. Joseph's

Donation Link

Count Trailing Zeros

Count_Trailing_Zeros_Example

Funnily enough, the non-array formula in B8 is not the fastest one. The array formula in B6 is slightly faster.

The formula in B7 would have been my favourite one if Excel© had a worksheet function REVERSE. Then we could just say
=LEN(A1)-LEN(--REVERSE(A1))