zillow publishes zestimate home valuations for 104 million homes across the country, and uses state of the art statistical and machine learning models that can. the zestimate® home valuation model is zillow’s estimate of a home's market value. the zestimate’s accuracy depends on location and the availability of data in an area. Some areas have more detailed home information available — such as square footage and. what is your house worth? Check your zestimate instantly. Improve your home’s value estimate with updated home facts. Request a free market value estimate…