How Accurate is Zillow's Zestimate? Here's the TRUTH...

Zillow Accuracy
The Zestimate’s accuracy depends on location and availability of data in an area. Some counties have deeply detailed information on homes such as number of bedrooms, bathrooms and square footage and others do not. The more data available, the more accurate the Zestimate value.

Data Coverage and Zestimate Accuracy

Zillow's accuracy has a median error rate of 4.3%. This means half of the home values in the area are closer than the error percentage. For example, in Seattle, Zestimate values for half of the homes are within 5.4% of the selling price, and half are off by more than 5.4%.

To improve Zestimate accuracy, we allow homeowners to edit their home facts and then we incorporate this information into our Zestimate calculations.

Be aware that in some areas, we might not be able to produce a Zestimate at all, but we do have some basic information on the homes. The tables below show you where we have Zestimates and other home information.

Zestimate Data Chart

HOMES ON ZILLOW:

This indicates the percentage of homes for which we have data (e.g., number of bedrooms or bathrooms) in a particular locale. These are the homes you can find via maps or search on Zillow.com.

HOMES WITH ZESTIMATES:

We can only calculate Zestimates for homes where we have certain data, including transactions. This column indicates the percentage of homes in an area with Zestimates.

WITHIN 5% OF SALE PRICE:

This is the percentage of transactions in a location for which the Zestimate was within 5% of the transaction price. For example, in the Portland area, 61.2% of the time the Zestimate was within 5% of the selling price.

WITHIN 10% OF SALE PRICE:

This is the percentage of transactions in a location for which the Zestimate was within 10% of the transaction price.

WITHIN 20% OF SALE PRICE:

This is the percentage of transactions in a location for which the Zestimate was within 20% of the transaction price.

MEDIAN ERROR:

Half of the Zestimates in an area were closer than the error percentage and half were farther off. For example, in Seattle, Zestimates for half of the homes are within 5.4% of the selling price, and half are off by more than 5.4%.

 

*This information is sourced directly from zillow's website. Last updated: August 08, 2017