Usually you can determine this by multiplying the EBITDA (Earnings Before Interest Taxes, Depreciation and Amortization) by a multiple for your industry.

Typically, for most businesses of this kind, that multiple is 2 times the EBITDA, dependent on how much time the new owner will need to spend in the business.

If it is a turn key-type operation, that multiple may be 5 times to 10 times the EBITDA, depending on how the new owner can leverage current operations.

Regardless, a good CPA can help you with the valuation, as well as a business broker should you decide to go in that direction.