Could you explain a bit, please? What possible errors could there be?

"Bernard Liengme" wrote:

Numbers in A1 and B1. my percentage is (B1-A1)/A1; Adjust to suit your needs

=IF(MOD((B1-A1)/A1*100,1)<0.00000001,TEXT((B1-A1)/A1,"#%"),TEXT((B1-A1)/A1,"#.#%"))

Note I do not check MOD for zero because of the possibility of round off
errors as with 2 and 4.56