Good morning, Elizabeth.
If you are wanting an accurate number for the 'most likely sales price' for your home, then a local REALTOR, like myself, can conduct the Market Analysis to look at the features of your home compared to those similiar 'sold' homes in your neighborhood and area. Online sources are not accurate.
It is very important that we get an accurate representation of your home and its features such as size, acreage if any, age, number of bedrooms, number of bathrooms, etc, as the features and the condition of your home compared to the features and condition of the homes in your area will give us an accurate 'history' of what today's buyers would be willing to pay for your home in today's market. I use the same historical data that an appraiser will use. If you are needing an official appraisal to be conducted, such as for obtaining a home equity line of credit, then your bank/lender is going to require an official appraisal from a licensed appraiser. I would be glad to conduct the market analysis, or I have appraiser references that I can provide as well.
If you are looking to sell your home, it is important to not only look at the recent market analysis, but to also have an agent with an extensive marketing program that will increase the exposure, and demand, for your home. Selling a home for the highest possible sales price is a combination of the correct pricing strategy and extensive marketing system.
REALTORS are a dime a dozen, but we aren't all created equal. When selling a home be sure to check an agents 'Key Performance Indicators' such as list price to sales price ratio, days on market, average sales price, % of listings actually sold, etc. As an example, because of my exclusive pricing and marketing systems, my list price/sales price ratio is 98% compared to 95% for our association. On a $100,000 home that is an extra $3000 in the seller's pocket.
You can contact me directly if you need any further assistance.