Financial disclosure does not tell you net worth. I did the math based on the figures below and estimated Bernie Sanders' net worth to be $1.2 to $1.5 million.
In fact, there is no reasonable way the self proclaimed "democratic socialist" does not have a net worth under $1 million. Politico in July 2015 reported his disclosed finances to be "less than $750,000 in assets — all of it in his wife’s name — according to his presidential personal financial disclosure form." That doesn't count was is not required to be disclosed. Read more: Bernie Sanders' wife accounts for all his reported assets
Financial disclosure reports for Federal candidates are not meant to be net worth summaries but are relatively incomplete tools for listing potential conflicts of interests. "Candidates of any wealth level aren’t required to reveal any information about their personal property—boats, cars, jewelry, artwork, furniture—and they don’t have to disclose their personal residences unless they generate income."