What is a Zestimate? Zillow's Zestimate Accuracy (2023)

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The Zestimate® home valuation model is Zillow’s estimate of a home’s market value. A Zestimate incorporates public, MLS and user-submitted data into Zillow’s proprietary formula, also taking into account home facts, location and market trends. It is not an appraisal and can’t be used in place of an appraisal.

How accurate is the Zestimate?

The nationwide median error rate for the Zestimate for on-market homes is 2.4%, while the Zestimate for off-market homes has a median error rate of 7.49%. The Zestimate’s accuracy depends on the availability of data in a home’s area. Some areas have more detailed home information available — such as square footage and number of bedrooms or bathrooms — and others do not. The more data available, the more accurate the Zestimate value will be.

These tables break down the accuracy of Zestimates for both active listings and off-market listings.

Active listings accuracy

Last updated: April 27, 2023

Off Market

Last updated: April 27, 2023

Note: The Zestimate’s accuracy is computed by comparing the final sale price to the Zestimate that was published on or just prior to the sale date.

Download an Excel spreadsheet of this data.

How is the Zestimate calculated?

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 examine hundreds of data points for each individual home.

To calculate a Zestimate, Zillow uses a sophisticated neural network-based model that incorporates data from county and tax assessor records and direct feeds from hundreds of multiple listing services and brokerages. The Zestimate also incorporates:

  • Home characteristics including square footage, location or the number of bathrooms.
  • On-market data such as listing price, description, comparable homes in the area and days on the market
  • Off-market data — tax assessments, prior sales and other publicly available records
  • Market trends, including seasonal changes in demand

Currently, we have data for over 110 million U.S. homes and we publish Zestimates for 104 million of them.


What changes are in the latest Zestimate?

The latest Zestimate model is our most accurate Zestimate yet. It’s based on a neural network model and uses even more historical data to produce off-market home valuations. This means the Zestimate is more responsive to market trends & seasonality that may affect a home’s market value. We also reduced overall errors and processing time in the Zestimate.

My Zestimate seems too low or too high. What gives?

The amount of data we have for your home and homes in your area directly affects the Zestimate’s accuracy, including the amount of demand in your area for homes. If the data is incorrect or incomplete, update your home facts — this may affect your Zestimate.

To ensure the most accurate Zestimate, consider reporting any home updates to your local tax assessor. Unreported additions, updates and remodels aren’t reflected in the Zestimate.

Check that your tax history and price history (the sale price and date you bought your home) are accurate on Zillow. If data is missing or incorrect, let us know.

Be aware that the model that creates the Zestimate factors in changing market trends, including seasonal fluctuations in demand. So in some cases that may be the reason for a change in your Zestimate.

I just listed my home for sale. Why did my Zestimate change?

When a home goes on the market, new data can be incorporated into the Zestimate algorithm. In the simplest terms, the Zestimate for on-market homes includes listing data that provides valuable signals about the home’s eventual sale price. This data isn’t available for off-market homes.

My home is on the market. Why is the Zestimate so far off?

Properties that have been listed for a full year transition to off-market valuations because they have been listed longer than normal for that local market. This can result in a large difference between the list price and the Zestimate.

I just changed my home facts. When will my Zestimate update?

Updates to your home facts are factored into the Zestimate. However, if the updates are not significant enough to affect the home’s value (eg: paint colors), your Zestimate may not change. Zestimates for all homes update multiple times per week, but on rare occasions this schedule is interrupted by algorithmic changes or new analytical features.

How are changes to my home facts (like an additional bedroom or bathroom) valued?

The Zestimate is based on complex and proprietary algorithms that can incorporate millions of data points. The algorithms determine the approximate added value that an additional bedroom or bathroom contributes, though the amount of the change depends on many factors, including local market trends, location and other home facts.

Is the Zestimate an appraisal?

No. The Zestimate is not an appraisal and can’t be used in place of an appraisal. It is a computer-generated estimate of the value of a home today, given the available data.

We encourage buyers, sellers and homeowners to supplement the Zestimate with other research, such as visiting the home, getting a professional appraisal of the home, or requesting a comparative market analysis (CMA) from a real estate agent.

Why do I see home values for the past?

We generate historical Zestimates for most homes if we have sufficient data to do so.

Do you ever change historical Zestimates?

We occasionally recalculate historical Zestimate values along with major data upgrades or improvements to the algorithm. These recalculations are based on a variety of considerations and, therefore, not every new algorithm release will get a corresponding update of historical values.

However, we never allow future information to influence a historical Zestimate (for example, a sale in 2019 could not influence a 2018 Zestimate). Historical Zestimates only use information known prior to the date of that Zestimate.

Does the Zestimate algorithm ever change?

Yes — Zillow’s team of researchers and engineers work every day to make the Zestimate more accurate. Since Zillow’s founding in 2006, we have deployed multiple major Zestimate algorithm updates and other incremental improvements are consistently released between major upgrades.

How often are Zestimates for homes updated?

We refresh Zestimates for all homes multiple times per week, but on rare occasions this schedule is interrupted by algorithmic changes or new analytical features.

Are foreclosure sales included in the Zestimate algorithm?

No. The Zestimate is intended to provide an estimate of the price that a home would fetch if sold for its full value, where the sale isn’t for partial ownership of the property or between family members. Our extensive analysis of foreclosure resale transactions supports the conclusion that these sales are generally made at substantial discounts compared to non-foreclosure sales. For this reason, the Zestimate does not incorporate data about these sales.

Who calculates the Zestimate? Can someone tamper with my home’s Zestimate?

The Zestimate is an automated valuation model calculated by a software process. It’s not possible to manually alter the Zestimate for a specific property.

Can the Zestimate be updated?

Yes. The Zestimate’s accuracy depends on the amount of data we have for the home. Public records can be outdated or lag behind what homeowners and real estate agents know about a property, so it’s best to update your home facts and fix any incorrect or incomplete information — this will help make your Zestimate as accurate as possible.

You can also add info about the architectural style, roof type, heat source, building amenities and more. Remember: updating home information doesn’t guarantee an increase in the value of Zestimate, but will increase the Zestimate’s accuracy.

Does Zillow delete Zestimates? Can I have my Zestimate reviewed if I believe there are errors?

We do not delete Zestimates. However, for some homes we may not have enough data to provide a home valuation that meets our standards for accuracy. In these instances, we do not publish the Zestimate until more data can be obtained.

The Zestimate is designed to be a neutral estimate of the fair market value of a home, based on publicly available and user-submitted data. For this purpose, it is important that the Zestimate is based on information about all homes (e.g., beds, baths, square footage, lot size, tax assessment, prior sale price) and that the algorithm itself is consistently applied to all homes in a similar manner.

I don’t know of any homes that have sold recently in my area. How are you calculating my Zestimate?

Zestimates rely on much more than comparable sales in a given area. The home’s physical attributes, historical information and on-market data all factor into the final calculation. The more we know about homes in an area (including your home), the better the Zestimate.

Our models can find neighborhoods similar to yours and use sales in those areas to extrapolate trends in your housing market. Our estimating method differs from that of a comparative market analysis completed by a real estate agent. We use data from a geographical area that is much larger than your neighborhood — up to the size of a county — to help calculate the Zestimate. Though there may not be any recent sales in your neighborhood, even a few sales in the area allow us to extrapolate trends in the local housing market.

I’m trying to sell my home and I think my Zestimate should be higher.

The Zestimate was created to give customers more information about homes and the housing market. It is intended to provide user-friendly data to promote transparent real estate markets and allow people to make more informed decisions — it should not be used to drive up the price of a home. Zestimates are designed to track the market, not drive it.

Can I use the Zestimate to get a loan?

No. The Zestimate is an automated value model and not an appraisal. Most lending professionals and institutions will only use professional appraisals when making loan-related decisions.

I have two Zestimates for my home. How do I fix this?

If you see two Zestimates for the same property, please let us know by visiting the Zillow Help Center and selecting Submit a request. You may see more than one Zestimate for your address if you are a homeowner with multiple parcels of land. Zillow matches the parcels on record with the county. If you officially combine parcels, the county will send us updated information.

What’s the Estimated Sale Range?

While the Zestimate is the estimated market value for an individual home, the Estimated Sale Range describes the range in which a sale price is predicted to fall, including low and high estimated values. For example, a Zestimate may be $260,503, while the Estimated Sale Range is $226,638 to $307,394. This range can vary for different homes and regions. A wider range generally indicates a more uncertain Zestimate, which might be the result of unique home factors or less data available for the region or that particular home. It’s important to consider the size of the Estimated Sale Range because it offers important context about the Zestimate’s anticipated accuracy.

How can real estate professionals work with the Zestimate?

Millions of consumers visit Zillow every month. When combined with the guidance of real estate professionals, the Zestimate can help consumers make more informed financial decisions about their homes.

Real estate professionals can also help their clients claim their home on Zillow, update the home facts and account for any work they have done on the property. A home’s Zillow listing is often the first impression for prospective buyers, and accurate information helps attract interest.

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What is a Zestimate? Zillow's Zestimate Accuracy? ›

How accurate is the Zestimate? The nationwide median error rate for the Zestimate for on-market homes is 2.4%, while the Zestimate for off-market homes has a median error rate of 7.49%. The Zestimate's accuracy depends on the availability of data in a home's area.

How accurate is Zillow's zestimate? ›

Zillow's Zestimate has been found to have a nationwide error rate of 1.9 percent for on-market homes. When it comes to estimating home values for off-market housing, the error rate jumps to 6.9 percent. Overall, Zestimate accuracy is between 95% and 96%, so it's pretty accurate in most cases.

Why is Zillow Zestimate inaccurate? ›

The most common reasons for inaccurate Zestimates are limited data, market volatility, and data errors. It's important to remember that your Zestimate is only an estimate based on a proprietary algorithm and the information it's fed.

How trustworthy is Zestimate? ›

Accuracy of Zestimates

According to Zillow's website, Zestimate's nationwide median error rate for active listings is 3.2%. 3 For off-market homes, it's now 6.9%. 4 Zestimates are only as accurate as the data behind them.

What is more accurate than Zestimate? ›

Redfin is more accurate when valuing homes.

Both Zillow and Redfin give homes an approximate value, but the Zestimate provided by Zillow has proven slightly less accurate than Redfin's estimate.

Is Zillow zestimate close to appraisal? ›

Zillow is clear that the Zestimate is not an appraisal and cannot be used as one. However, it also claims that the median error rate for Zillow estimates of on-market homes is only 2.4%. This varies significantly by city and state.

Why are Zillow estimates so high? ›

Another reason the estimates are so off is that their evaluation method differs from that of a comparative market analysis (CMA) completed by a real estate agent or a home appraisal completed by a local certified appraiser. Geographically, the data Zillow uses is much broader than just your neighborhood or town.

Why does Zillow undervalue my house? ›

Home sales in your area are affecting the data

If homes in your area are selling for under market value, that will affect your estimated home value. Zillow's algorithm creates your estimate in part by pulling your home's square footage from tax records, then pulling data from recent home sales in your area.

How do I get my Zillow zestimate higher? ›

You can't directly change your Zestimate, but you can influence it by updating your home's information. To update your Zestimate, you need to claim your home on Zillow, then update key information such as number of bedrooms, bathrooms, and square footage.

What is the Zillow scandal? ›

Zillow took a $304 million inventory write-down in the third quarter, which it blamed on having recently purchased homes for prices that are higher than it thinks it can sell them. Tiffany Hagler-Geard/Bloomberg/Getty Images.

Do banks use Zestimate? ›

It's also important to note that automatic valuations such as a Zillow Zestimate are not used by banks or lenders to estimate a property's value for a mortgage. Only an appraisal from a licensed appraiser can be used for a mortgage.

What if my zestimate is wrong? ›

If you're unsatisfied with your Zillow Zestimate, you unfortunately won't be able to directly change it. But you can influence your Zestimate by updating information about your home, fixing incorrect information, and adding rich details to make sure your home's profile is complete.

Why is Zillow estimate lower than Redfin? ›

Most of the time, Zillow and Redfin have different estimates for your house because they have slightly different approaches to calculating home values. However, if there's a big gap between your Zestimate and Redfin Estimate, it may mean that one company has inaccurate information about your home.

Who has the most accurate property value? ›

From this sample, QV was the most accurate, followed by Homes.co.nz, TradeMe and then OneRoof. Now, the conclusion most people will take away from this is that QV is the most accurate at predicting house prices.

Which property valuation is most accurate? ›

The estimates are based on various assumptions and may not always be accurate or comprehensive. For a more reliable assessment, homeowners can consider an appraisal conducted by a licensed real estate professional or a comprehensive property valuation prepared by an accredited valuer.

Which home price estimate is most accurate? ›

  1. Redfin. The most accurate home value estimator is Redfin as it uses historical pricing data and also considers real-time demand and market trends. ...
  2. Zillow. ...
  3. Realtor.com. ...
  4. Trulia. ...
  5. Ownerly. ...
  6. Chase. ...
  7. RE/MAX. ...
  8. Homelight.
Mar 26, 2023

Is Zestimate or Realtor more accurate? ›

Are Realtor Estimates Accurate? A Realtor estimate, or a Comparative Market Analysis, should be more accurate and more detailed than an online valuation tool like a Zestimate. There are several reasons for this. First, real estate agents who know a particular area will be intimately familiar with the comparable sales.

Why did my zestimate drop drastically? ›

This can happen for many different reasons that may or may not reflect your home's actual market value — such as a change in Zillow's algorithm, missing or faulty data, or shifts in the market.

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