Here in TN, I look at properties that have sold within a half mile within the last 6 months. Also, I check out what is currently available and what is under contract and how long they have been on the market and how many reductions they have had. All these factors will play a part in what your house is worth. Your house is worth what a ready and willing buyer is going to pay for it--and by checking the last 6 months of sales, pending contracts, and active listings, a local REALTOR will be able to give you a good ball park figure. I hope that helps.
Cindi is right, those would be your best options. Try to steer clear from Zillow.com as most of us have found it to be inaccurate at times. You would probably want to obtain a market analysis from atleast 2 Realtors and look them both over carefully.
Century 21 Infinity
I have many appraisers come in and ask for my comps within a 1 mile area.. and then they look at the house and arrive at a number, they often even ask for access to our office to ustilize the MLS to do so.
Find a good Realtor, be honest and tell them you are testing the waters for what ever your reason may be looking for the number for your home.
Where are you located? Maybe I can help.
Broker / Sales Associate
732-213-1409 - direct
The only way to find out what it will appraise for it to actually pay for the appraisal and have it done by the person licensed to give you what you asked for "What will it appraise for?" Keep in mind that even two appraisers may be 10% off on their valuation since no two homes are identical and there is some subjectivity to their answers.