Wiktionary
as often as not
prep.phr. (context idiomatic English) more or less half of the time; on many occasions but not always; frequently.
Usage examples of "as often as not".
Do you believe he would pay in fivers, which can as often as not be traced and which could also have, if not his prints, then those of the cashier issuing them?
The Oaths were supposed to make people trust Aes Sedai, or at least not fear their power, but Aes Sedai still had to move in secret as often as not.
He could not believe it, but then again, even women who were not Aiel were odd as often as not.
Sixty years had passed since he set out on his memorable journey, and he was old even for Hobbits, who reached a hundred as often as not.