If you’re trying to figure out what your home is really worth, free online home value estimators can be a quick place to start. These tools use public data, comparable sales, and market trends to generate an instant estimate — but even the best ones can miss the mark by thousands of dollars.
We tested the top free home value estimators of 2025 to see which are most accurate and where they fall short. The results? Redfin and Zillow remain the strongest performers, but none of the algorithms come close to a professional comparative market analysis (CMA) from a local agent.HomeLight home value estimator
🏆 Key Findings
- Redfin Estimate: Most accurate for on-market homes (≈ 1.9% median error)
- Zillow Zestimate: Covers the most homes nationwide but less precise for off-market properties
- Realtor.com Estimate: Uses three professional data sources, though it doesn’t publish error rates
⚠️ Even the most accurate online tools can be off by 5–7% — a $25K–$40K swing on a $500K home.
💡 Want real accuracy? Get a free professional CMA from a top local agent.
While online estimators are helpful for curiosity or early research, don’t rely on them to set your list price or refinance value.
This guide is the result of hundreds of hours of research conducted by the Real Estate Witch team. We evaluated dozens of home value estimators, testing them with properties across the country to identify the tools that offer the most accurate results — and to weed out the ones that fell short.
This guide also draws on our in-house experts, including:
Our findings are backed by insights from in-house experts, including:
Trent Seigfried, Data Analyst. Trent specializes in uncovering patterns in large real estate datasets and is the founder of multiple personal finance websites.
Ben Mizes, Investor and Co-Founder of Clever Real Estate. Ben owns a portfolio of 22 properties in St. Louis, is a licensed real estate agent in Missouri, and played a key role in growing Clever into one of the nation’s top real estate education platforms.
Steven Nicastro, Investor and Realtor. Steve has closed $6 million in real estate transactions in Charleston, South Carolina, during 2020 and 2021, and has bought and sold 30 homes as an agent and investor. His writing credentials include contributions to NerdWallet, The New York Times, USA Today, the Associated Press, and U.S. News.
5 most accurate home value estimators of 2026
To find the most accurate home value estimators, we tested popular tools from major real estate sites and mortgage lenders. Each tool was run on a mix of urban, suburban, and rural homes to see how close its estimated value came to the property’s actual sale price or market-verified appraisal.
Even the highest-rated estimators are only directionally accurate. For most homeowners, the real value comes from comparing your online number with a professional CMA — which factors in updates, local buyer demand, and the finer details algorithms miss.
Our rankings weigh four factors:
- Median error rate (how far off estimates were from the sale price)
- Coverage (number of homes in the database)
- Update frequency (how often estimates refresh)
- User experience (speed, transparency, and usability)
Median error rate is the best single measure of accuracy — it means half of the homes estimated have final sales prices that fall within that margin, and the final sales price of the other half of homes are off by more than the median error rate. A 2% error rate might not sound like much, but on a $600,000 home, that’s a median $12,000 gap.
Below, you’ll find the five most accurate estimators of 2025, based on our testing and published company data.
1. Zillow (and Trulia) home value estimator
Zillow’s Zestimate — also available on its sister site, Trulia — remains the most widely used home value estimator in the U.S. With more than 100 million monthly visitors, it’s often the first stop for curious homeowners. But while its reach is unmatched, its accuracy still depends heavily on whether your home is currently listed for sale.
🧾 Quick facts: Zillow Zestimate
- Median error rate: 7.06 % (off-market) | 1.9 % (on-market)
- Coverage: 116 million homes (≈ 80 % of U.S. housing stock)
- Updates: Daily for active listings, weekly for off-market homes
- Data sources: MLS records, tax assessments, user submissions
- Limitations: Recent renovations and unique features often missed
Why it ranks among the best
Zillow’s estimator draws on one of the largest real estate databases in the world. That depth of data helps it outperform most smaller tools, especially in major metro areas where MLS information updates frequently. In our testing, Zillow provided consistent, detailed valuations with clear comparable-sales data and property-history charts.
Where it falls short
Accuracy depends on whether your home is on or off the market. Zillow reports a 7% median error for off-market properties — meaning half of those estimates were off by more than $35,000 on a $500,000 home. For active listings, the error drops to roughly 2 %, since MLS data provides more current information.
It’s also worth noting that median error hides the full range of variation: while half of Zillow’s off-market Zestimates fall within ± 7 %, the other half deviate even more. Homes with custom updates, rural locations, or recent renovations tend to be least accurate.
🚨 Zillow's error rate may be misleading
The median error rate can be deceptive, masking how often home value estimators miss the mark.
Here’s the catch: Only 50% of homes fall within Zillow's reported median error range. For the other 50%, the error rate can be even higher. So, if you use Zestimate for an off-market home, there's a 50/50 chance the estimate could be off by more than 7.06%. For a $500,000 home, that’s a potential error of over $37,000.
Bottom line
Zillow offers a quick, credible snapshot of your home’s value — but it’s still an algorithm, not an appraisal. Use it as a starting point, then compare your Zestimate with a professional CMA from a local agent to see how close it comes to reality.
👉 Check your Zestimate, then get a free, detailed CMA to learn what your home could actually sell for.
» MORE: How to Increase Your Zillow Zestimate in 5 Steps
2. Redfin home value estimator
🧾 Quick facts: Redfin Estimate
- Median error rate: 7.7 % (off-market) | 1.98 % (on-market)
- Coverage: ≈ 92 million homes nationwide
- Updates: Daily for on-market homes, weekly for off-market
- Data sources: MLS records, public data, regional market trends
- Limitations: Limited coverage in small towns and rural areas
Why it ranks so high
Redfin’s home value estimator, called Redfin Estimate, is slightly more accurate than Zillow’s Zestimate for active listings, but less accurate for off-market properties. Redfin’s estimator refreshes more frequently than most competitors — updating daily when a home is listed and weekly when it’s not. That real-time connection to MLS feeds helps it outperform Zillow for on-market accuracy. In our tests, the Redfin Estimate consistently landed within 2% of final sale prices for active listings, giving it a slight edge over Zillow’s Zestimate in those cases.
Redfin also earns points for its homeowner dashboard, which displays nearby sales, local pricing trends, and an easy way to track your property’s value over time.
Redfin Estimate has a median error rate of 7.70% for off-market homes and 1.98% for on-market homes.[1] This means that when a home on the market sells, its estimate will be within 1.98% of the sales price half of the time, and 7.70% for off-market properties.
Where it falls short
Redfin’s accuracy drops when homes aren’t listed publicly. The estimator’s 7.7 % median error for off-market properties reflects its smaller database compared with Zillow’s.[2] We also found coverage gaps in smaller towns and rural counties — if your property isn’t tied to an MLS record, Redfin’s tool may return no estimate at all.
Bottom line
The Redfin Estimate shines for sellers in metro markets or anyone tracking an active listing, but its limited rural coverage can make it less useful for off-market homes. It’s a strong place to start — just don’t skip the next step of asking an expert real estate agent for a CMA.
» COMPARE: Zillow vs. Redfin: Which Estimator Is Best?
3. Realtor.com home values
Realtor.com’s My Home tool stands out because it delivers multiple valuations from professional data providers instead of a single algorithmic estimate. It’s a smart option for homeowners who want a broader view of what their property might be worth — though it lacks the transparency and precision data that competitors like Zillow and Redfin publish.
🧾 Quick facts: Realtor.com My Home tool
- Median error rate: Not disclosed
- Coverage: Nationwide
- Data sources: CoreLogic, Collateral Analytics, and Quantarium
- Updates: Weekly to monthly, depending on data feed
- Limitations: No published accuracy rate or user-customization options
Why it's useful
Unlike most online estimators, Realtor.com compiles data from three major industry sources — the same analytics firms mortgage lenders use. Getting multiple data points from a single search can help you see a valuation range rather than one fixed number. The interface is also clean and easy to navigate, offering recent comparable sales and market-trend charts for context.
Where it falls short
Despite its professional data sources, Realtor.com doesn't release a median error rate, making it impossible to directly compare its precision with Zillow or Redfin. You can't adjust home details, account for upgrades, or save your estimate for future reference, which limits its usefulness beyond initial curiosity.
Bottom line
Realtor.com's estimator offers valuable perspective — especially if you like seeing multiple data sets
— but it's still a starting point, not a pricing strategy. If you're preparing to list or refinance, you'll need a customized analysis that reflects your home's true condition and market position.
4. Bank of America home values
Bank of America's home value estimator is one of the few tools offered by a major U.S. bank — and it's impressively fast. Within seconds, you'll get a property overview, estimated value range, historical trend chart, and a map of recent comparable sales. That convenience makes it a handy reference point, though not a substitute for an expert valuation.
🧾 Quick facts: Bank of America estimate
- Median error rate: Not disclosed
- Coverage: National (single-family homes and condos)
- Updates: Monthly or as new comps become available
- Data sources: Public records, MLS data, and property analytics
- Limitations: Often relies on older comparable sales (6–12+ months)
Why it's worth a look
The Bank of America estimator provides one of the most visually detailed reports of any free tool. It pairs an estimated value with a property summary, value-history graph, and nearby sales map. For homeowners exploring equity or refinancing options, this quick snapshot can offer helpful context.
Where it falls short
We found that Bank of America often uses outdated comparable sales to determine a home's value.
Bank of America's estimator is polished and informative, but it's not fine-tuned for real-time market accuracy. Consider it a starting point if you're reviewing home equity — not if you're setting a list price.
5. PennyMac home value estimator
PennyMac is one of the nation's largest mortgage lenders, servicing nearly $666 billion in loans annually.[3] Its home value estimator is one of the simplest tools on the list — fast, free, and easy to use. PennyMac pulls directly from public records and loan data to generate instant estimates, which can be helpful for borrowers exploring refinance options. But simplicity comes at the cost of depth and precision.
🧾 Quick facts: PennyMac estimate
- Median error rate: Not disclosed
- Coverage: Nationwide (single-family homes only)
- Updates: Periodic; frequency not stated
- Data sources: Public property and loan records
- Limitations: Uses outdated comparables; no saved reports or alerts
Why it's convenient
The tool returns an estimate in seconds and displays accurate basic property details, like square footage and lot size. It also includes a quick list of comparable sales and value trends — enough to satisfy curiosity or serve as a preliminary check for mortgage-related decisions.
Where it falls short
Like Bank of America's estimator, PennyMac often relies on older comparable sales, sometimes more than six months old. That can distort its accuracy in dynamic markets. The platform also lacks features that competitors offer — such as saving your estimate, tracking updates, or customizing inputs based on recent improvements.
Bottom line
PennyMac’s estimator is great for a fast snapshot but not for strategic pricing. Use it if you want a general benchmark, but verify the number before making any big financial moves.
Other popular home value estimators
- Chase home values: Chase Bank's home value estimator frequently uses outdated comparable sales to estimate a home's value. And its property information is often inaccurate. For example, our test property and its comparables had the wrong number of bedrooms and bathrooms. Finally, Chase home values can't be saved, and users can't add renovations or improvements.
- Ownerly home values: Ownerly is the only home value estimator we tested that's not free. It costs $1 for a 7-day trial (you can run up to 25 reports during the trial period), followed by $29.99 monthly. We found its estimates comparable to free options, including Zillow and Redfin.
- HomeLight home value estimator: HomeLight doesn't provide any information or data about its home value estimates. It produced the lowest or second-lowest home valuation estimates in our tests. While that’s not necessarily proof that HomeLight is less accurate, it suggests that HomeLight may be using outdated or inaccurate information.
There are countless other home value estimators, but most are essentially rebranded versions of one of the above calculators.
Here are some of the most popular online calculators not covered in this review:
💰 Paid home value estimators
Other companies, such as Attom Data, CoreLogic, HouseCanary, Quantarium, and Black Knight, offer paid home value estimates. These companies typically promise greater accuracy and more data about a property than you would get with a free home value estimator.
For example, Attom claims to have assessor data for over 155 million properties and their valuations, plus recorder data for more 430 million transactions covering over 3,140 counties.[4]
However, we don't think you need to pay for a home value estimate to help you sell your home. A real estate agent can get you a far more accurate CMA for free and with no obligation.
Most paid home value estimators are marketed toward real estate professionals like brokers and investors. However, if you're considering buying a new investment property, a paid estimator may provide some value.
Unfortunately, none of the paid estimators share information about the accuracy of their estimates, so we can't recommend one over the other.
How accurate are home value estimators?
Online home value estimators are helpful for getting a ballpark figure, but they're far from perfect. Most online estimators have a median error rate of approximately 2% to 7%. That might not sound like much, but a 5% median error rate on a set of $500,000 homes means that half of those valuations will be off by $25,000 or more.
Mark Cassidy, Chief Valuation Officer at Service1st, notes that mortgage lenders use home value estimators simply because they work with so many homes. "They are high-volume users that weigh their risk statistically across multiple loans, so extreme accuracy on each individual property valuation is not always necessary when making a loan decision," he explains. By contrast, "Sellers need to know they are getting the full value for their homes."
The error rate can be worse depending on where you live, whether or not your home is already listed, how long ago you bought it, and whether it was recently renovated.
A common issue with estimator tools is that their assessments are based on the amount that "similar" properties have sold for near you. Algorithms need to make assumptions about your property that may or may not be true, inevitably leading to mistakes.
For example, two properties may appear identical to an algorithm, but if one has a renovated kitchen, that can add $20,000 extra to the list price.
What algorithms can't see
Automated valuation models (AVMs) use tax records, public data, and comparable sales to calculate value. But they often miss:
- Recent renovations or upgrades (like remodeled kitchens or new roofs)
- Interior condition or design updates
- Lot desirability, views, or street noise
- Local buyer demand and micro-market trends
- Sales that include buyer concessions or special terms
- Non-disclosure states, where sale prices aren’t public
As a result, even a small data gap can lead to a big pricing miss.
To get a far more accurate estimate of your home’s value, consult a real estate agent and get a free CMA.
Why getting an accurate home value matters
Accurately determining your home’s value is one of the most critical steps when selling — and even buying — a property.
For sellers, the home value serves as a key data point when setting the listing price. An incorrect estimate can have costly consequences. Consider this: Sellers who used a real estate agent earned an average profit of $207,500 — a staggering $79,000 more than the $128,500 earned by sellers who went the FSBO route, according to a Clever Real Estate study.
This difference often stems partly from the use of professional tools like comparative market analyses (CMAs) provided by agents, which ensure precise pricing. In contrast, FSBO sellers frequently rely on less accurate online estimators.
"Getting valuation information that is inaccurate can affect listing times and the bottom-line sale price," notes Cassidy.
How pricing impacts your home sale success
Setting a higher price may encourage buyers to offer more, but overpricing can deter interest and leave your home sitting on the market. On the other hand, underpricing may generate quick offers but could mean leaving thousands of dollars on the table.
Accurate pricing, guided by professional expertise, is essential to achieving the best possible outcome in today’s real estate market.
A recent Harvard University study also highlights the importance of pricing in real estate, revealing that the initial price in negotiations often sets the tone for the final deal. Listing your home at a higher price can encourage buyers to offer more.[5]
CMAs give the most accurate home value estimates
You'll get the most accurate home value estimate by asking a real estate agent for a CMA.
A CMA is completely free, and you have no obligation to hire the real estate agent who completes it.
Why are CMAs better than online estimators?
CMAs are in-person assessments performed by a local real estate agent, while online estimators rely on an algorithm.
Both CMAs and online estimators use recent comparable sales ("comps") to determine your home’s value. But a realtor can handpick comps that are far more similar to your home, which results in a much more accurate home value estimate.
A realtor handpicks properties based on quantitative and qualitative factors.
They can account for factors that algorithms struggle to measure or don’t include in evaluations, like:
- Whether your house has a desirable view or is on a busy street
- The nuances of what buyers are looking for in your local market
- Photos on the multiple listing service (MLS) that give insight into other homes’ conditions
- Whether other home sales included buyer concessions, which might result in a different sale price than what you could get for your property
A realtor’s experience and local market knowledge almost always make their CMAs more accurate than an online home value estimator.
FAQ
Should I use a home value estimator if I'm selling?
For sellers, a home value estimator will give you a ballpark estimate of what your home may be worth, but dont rely on it to set your list price. Home value estimators are inaccurate, and a real estate agent can provide a more accurate estimate for free with a comparative market analysis.
Should I use a home value estimator when refinancing?
Just like with a mortgage, refinancing requires you to get an appraisal to ensure that the loaned amount lines up with what your house is actually worth. A property value website is too unreliable for any lender to take seriously. It's best used for a ballpark home value estimate. Learn more about home value website accuracy rates.
Because an appraisal is done in-person, the appraiser has a better idea of the condition of your home than a home estimator does. That can mean the appraised value of your home and therefore what you can refinance it for may be far from what an online home value estimator says.
But a home value estimator can give you a ballpark estimate of how much you may be able to refinance for just dont be surprised if that estimate ends up being far from what a bank will actually lend you.
Should I get an appraisal before I list my home?
Probably not. Appraisals are mostly for mortgage lenders. They dont have much to do with getting you the best list price for your home.
In most cases, an appraisal is done after a buyer has already made an offer on your home. The mortgage lender typically requests one to ensure that the property isnt overpriced and that the lender is giving a fair amount for the mortgage. So the appraisal is more about protecting the lenders interests, not yours.
Unlike a lender, your real estate agent is approaching your home value as a marketing opportunity. Theyre looking to land you a sale price that is both relatively high and likely to attract offers from buyers.
What is the assessed value of a home?
Assessed value is the value assigned to your property by a government assessor in order to calculate your property tax obligations. It is different from and often lower than your homes fair market value, which is what your house could sell for on the market. Thats why you shouldnt use your homes assessed value to determine a listing price.
Assessed value differs by tax districts, but usually it is based on your homes condition, size, and features, as well as current local property values. In some areas, the assessed value is a percentage of the fair market value.
Why do different home value estimators give different estimates?
Each home value estimator uses its own algorithm to decide how much a home is actually worth. These algorithms weigh different aspects of a property differently, which results in different home values.
For example, one home value estimator may place more weight on a renovated kitchen than another one. Or one estimator may only use sales data going back one year, while another uses sales data going back two years.
These differences begin to snowball, resulting in differences in home value estimates that can run in the tens or even hundreds of thousands of dollars.
Why doesn't my home have a Zestimate?
Sometimes Zillow and other home value websites just doesnt have enough data about a property to estimate its value. This may happen for a number of reasons.
For example, if you live in a non-disclosure state where real estate transactions arent publicly reported, Zillow may not have access to enough information about your home to make a Zestimate.
The other potential issue is if there arent enough real estate transactions in your county or ZIP code. Zestimates are based on what similar properties to yours have sold for in your area, so without that data an online home value estimate is nearly impossible. This is more likely to happen to you if you live in a rural area.
Read our Zillow home value estimator review for more information.
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