Insurance Coverage on Rentals

[Kyle Alexander]

Hello all, still trying to get my first property. I'm looking at a duplex in TX, and trying to do some calculations to see if the price is worth it.  Does anyone have a rule of thumb that they use for their calculations for insurance costs on a potential property? What kind of coverage would you carry? I understand that the best way is to call an agent to get numbers on insurance, but I was just wondering if there is a quicker formula or rule of thumb that can help to save a little time before getting to the point of calling an insurance agent.  Any helpful input will be greatly appreciated!! 

Thank You

Kyle Alexander