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How Accurate is the Zestimate?

How Accurate is the Zestimate?

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.

Data Coverage and Zestimate Accuracy

Nationally, the Zestimate has a median error rate of 5%, which means half of the Zestimates in an area are closer than the error percentage and half are farther off. For example, in Seattle, Zestimates for half of the homes are within 4.9% of the selling price, and half are off by more than 4.9%.

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.

Definitions

ZESTIMATE ACCURACY/STAR RATING:
This rating is tied to the Median Error in an area. The ratings are as follows:

  • Four Stars = Best Zestimate
  • Three Stars = Good Zestimate
  • Two Stars = Fair Zestimate
  • One Star = Tax assessor’s value, or unable to compute Zestimate accuracy
  • 0 stars = No valuation
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. Nationwide, Zestimates are currently within 5% of the final sale price 53.9% of the time.
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. In the U.S. as a whole, Zestimates are currently within 10% of the final sale price 75.6% of the time.
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. Nationally, Zestimates are currently within 20% of the final sale price 89.7% of the time.
MEDIAN ERROR:
Half of the Zestimates in an area were closer than the error percentage and half were farther off. The median error rate for the country is currently 4.5%, meaning half of Zestimates nationwide were within 4.5% of the final selling price, and half are off by more than 4.5%.

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