The fastest way to find your home's market value

The market value of your home is what a buyer would pay for it today, in a normal sale. You can find a rough estimate in about 15 minutes using free online tools, but the number will be more accurate if you also look at what similar homes sold for recently in your neighborhood.

Start with Zillow, Redfin, or Realtor.com. Enter your address and you'll get an automated estimate called a "Zestimate" (Zillow), "Redfin Estimate," or "Home Value" (Realtor.com). These tools use public records, recent sales, and property details to calculate a range. The estimate usually comes with a margin of error — Zillow's Zestimate, for example, is off by 5% or more in about one out of five homes.

For a more grounded number, look at the "comparable sales" or "comps" section on the same sites. These show you actual homes that sold nearby in the last 90 days. Pick homes that are similar in size, age, condition, and location — not a foreclosure or a major renovation. The price per square foot of those homes gives you a better sense of what yours might be worth than an algorithm alone.

Key Takeaways

  • Free online estimates from Zillow, Redfin, or Realtor.com give you a starting point, but they are usually off by several percent.
  • Comparable sales — homes that actually sold nearby in the last 90 days — are more reliable than automated estimates because they reflect real market activity.
  • A real estate agent can pull a formal market analysis for free and will have access to sales data you cannot see online.
  • Your county assessor's website shows the assessed value for tax purposes, which is not the same as market value and is usually lower.
  • If you need an official value for a loan, refinance, or legal matter, you will need a professional appraisal, which costs $300 to $600.

Why online estimates are a starting point, not the final answer

Automated home value tools work by feeding your address into a formula that weighs recent sales, property taxes, square footage, and other public data. They are fast and free, which is why millions of people use them. But they cannot see inside your home, they do not know if you have updated the kitchen or let the roof deteriorate, and they miss neighborhood details that affect price — like whether your street is quiet or next to a highway.

The margin of error varies by market. In hot real estate markets with lots of recent sales, the estimate is usually closer. In rural areas or neighborhoods where homes sell infrequently, the estimate can be off by 10% or more. If your home is unusual — a custom build, a historic property, or something with major damage — the algorithm struggles even more.

Use the online estimate as a sanity check, not as your final number. If Zillow says your home is worth $300,000 but comparable homes nearby sold for $250,000, the estimate is probably too high.

How to find and evaluate comparable sales

Comparable sales are homes that sold recently and are similar to yours. You can find them on Zillow, Redfin, or Realtor.com by searching your neighborhood and filtering for homes that sold in the last 90 days. Look for homes within a few blocks of yours, with similar square footage (within 10% to 15%), similar age, and similar condition.

For each comparable, note the sale price and calculate the price per square foot by dividing the sale price by the square footage. If a 2,000-square-foot home sold for $400,000, that is $200 per square foot. If your home is 2,200 square feet, multiply $200 by 2,200 to get a rough estimate of $440,000. Do this for three to five comparables and average the results.

Adjust for major differences. If a comparable home has a finished basement and yours does not, subtract 5% to 10% from its price before using it. If yours has a newer roof and the comparable does not, add a small amount. These adjustments are rough — the point is to account for obvious differences, not to calculate down to the dollar.

Getting a free market analysis from a real estate agent

A real estate agent can pull a Comparative Market Analysis (CMA) for free, even if you are not planning to sell. The CMA is more detailed than what you can see online because agents have access to the local Multiple Listing Service (MLS), which includes sales data that does not always appear on public websites right away.

Contact two or three agents in your area and ask for a market analysis. They will usually send it to you within a day or two. The CMA will list comparable sales, homes currently for sale, and homes that were listed but did not sell. It will also include the agent's opinion of your home's value based on their local knowledge.

You do not have to list your home with the agent or commit to anything. Agents offer this service because they hope you will call them when you are ready to sell. If an agent pressures you or seems to inflate the value unrealistically, move on to the next one.

Understanding your county assessor's value versus market value

Your county assessor assigns a value to your home for property tax purposes. You can find this on your property tax bill or on your county assessor's website. This assessed value is not the same as market value, and it is usually lower.

Assessors use different methods than the real estate market does. They may update values every few years rather than annually, they may use formulas that do not account for recent renovations, and they are constrained by state law on how much the assessed value can increase year to year. In some states, the assessed value can only rise 2% per year even if the market has jumped 10%.

The assessed value is useful as a reference point, but do not use it as your estimate of what your home would sell for. If you think the assessed value is wrong, you can challenge it through your county's assessment appeal process, but that is a separate issue from finding the market value.

When you need a professional appraisal instead

If you are refinancing a mortgage, applying for a home equity loan, or involved in a legal dispute over your home's value, the lender or court will require a professional appraisal. An appraisal is an official estimate conducted by a licensed appraiser who inspects the home, reviews comparable sales, and produces a formal report.

An appraisal costs between $300 and $600 depending on your home's size and location. The appraiser will visit your home, take photos, measure rooms, note the condition of the roof and foundation, and check for major issues. They will then pull comparable sales and write a detailed report explaining how they arrived at the value.

You cannot order an appraisal yourself for most purposes — the lender or party requesting it will order it and choose the appraiser. If you are curious about your home's value for personal reasons, you can pay for an appraisal out of pocket, but it is expensive for what you get. The free and low-cost methods above will give you a solid estimate for most situations.

Using your estimate for taxes, insurance, and planning

Once you have a reasonable estimate of your home's value, you can use it for several purposes. If you are considering a home equity loan or line of credit, lenders will want to know your home's value to determine how much you can borrow. If you are updating your homeowners insurance, the insurer may ask for the replacement cost of your home, which is related to but not identical to market value.

Your estimate is also useful for estate planning. If you are updating a will or trust, knowing your home's approximate value helps you understand your total assets. For property tax appeals, you can use comparable sales data to argue that your assessed value is too high.

Keep in mind that your estimate is a snapshot in time. Home values change with the market, with interest rates, and with changes to your neighborhood. An estimate from six months ago may be outdated. If you need an accurate number for a major financial decision, pull a fresh estimate or ask an agent for an updated CMA.

Frequently Asked Questions

Is the Zillow estimate accurate?

Zillow's Zestimate is accurate within 5% for about four out of five homes, but it can be off by 10% or more for unusual properties, rural homes, or neighborhoods with few recent sales. Use it as a starting point, not as your final answer. Compare it to comparable sales in your area for a better sense of the real value.

What is the difference between assessed value and market value?

Assessed value is what your county uses for property taxes and is usually lower than market value. Market value is what a buyer would actually pay for your home today. They are calculated differently and serve different purposes — do not confuse them.

Can I use an online estimate to refinance my home?

No. Lenders require a professional appraisal, not an online estimate. The appraisal is ordered by the lender and costs $300 to $600. Online estimates are useful for your own planning, but they are not official documents.

How often should I check my home's value?

If you are just curious, once a year is fine. If you are planning to refinance, sell, or borrow against your home, pull a fresh estimate within the last month or two. Market conditions change, and an estimate from six months ago may not reflect current prices.

Do I need to pay for a market analysis from a real estate agent?

No. Real estate agents provide market analyses for free because they hope you will list with them when you sell. You can contact multiple agents and compare their analyses at no cost. There is no obligation to work with any of them.