Calculating net worth involves adding up all your assets and subtracting all your liabilities. The resulting sum is your net worth.
For purposes of crowdfunding, the value of your primary residence is not included in your net worth calculation. In addition, any mortgage or other loan on your home does not count as a liability up to the fair market value of your home. If the loan is for more than the fair market value of your home (i.e., if your mortgage is underwater), then the loan amount that is over the fair market value counts as a liability under the net worth test.
For more information about how to calculate your net worth, please visit the SEC's Investor Bulletin.