So you arrive at three property cap rates averaging 9.2 percent. Your property's net operating income is $31,000. Now all you have to do is divide the net operating income by the cap rate: $31,000 divided by .092 comes out to $226,957. There's the value of your property. Learn more in CFI’s Real Estate Modeling Course. Cap Rate Formula. The formula for Cap Rate is equal to Net Operating Income (NOI) divided by the current market value of the asset. Where: Net operating income is the annual income Annual Income Annual income is the total value of income earned during a fiscal year. Gross annual income refers to all earnings before any deductions are made, and net annual income refers to the amount that remains after all deductions are made. The capitalization rate (also known as cap rate) is used in the world of commercial real estate to indicate the rate of return that is expected to be generated on a real estate investment property.