Estimate a home’s value from its size and the price per square foot of comparable recent sales, then adjust for condition and features.
Please do not make financial decisions based on these results.
What is the Home Value Calculator?
Estimate a home’s value from its size and the price per square foot of comparable recent sales, then adjust for condition and features. To use the Home Value Calculator, enter home size, comparable price per sq ft, second comparable price per sq ft, third comparable price per sq ft, condition adjustment, other adjustments for bedrooms, bathrooms, lot or upgrades and a few more values; it returns estimated value, likely value range, price per sq ft used, and shows them instantly as you type.
How a home value estimate works
This calculator estimates value the way many agents do a first pass: it multiplies the home’s living area by the price per square foot of similar homes that sold recently, then adjusts for condition and features. It is a quick sanity check, not a valuation.
You can enter one comparable price per square foot or up to three. With more than one, the calculator averages them, which smooths out a single unusually high or low sale.
What comparables are and how to find price per square foot
Comparables, or “comps”, are homes that recently sold near yours and are similar in size, age, style, lot and condition. Agents commonly look at sales from the last three to six months, in the same neighborhood, and within a modest size range of the subject home.
For each comp, divide the sale price by its living area in square feet. A $450,000 home with 2,000 sq ft is $225 per sq ft. Use sold prices, not asking prices, and measure living area the same way for every home. Sold prices are in county records, on public listing portals and from any agent, and our price per square foot calculator does the division.
What else affects a home’s value
Price per square foot ignores several things that move value. Enter them as a condition percentage or as a dollar adjustment in this calculator.
- Location. School zone, street, noise, and distance to work and transit often matter more than the house itself.
- Condition and age. Deferred maintenance, an old roof or dated kitchen lower value; recent upgrades raise it.
- Lot and layout. Lot size, garage, basement, and the number of bedrooms and bathrooms.
- Market timing. Interest rates and local supply change prices from month to month, so old comps can mislead.
Estimate, appraisal, CMA and AVM: what is the difference?
Several tools get called a “home value”. They differ in who makes them and how much they can be relied on.
- This calculator. A single multiplication from comps you choose. Fast and transparent, but only as good as the comps.
- Appraisal. A licensed appraiser inspects the home and compares it with sales. Lenders require one for most mortgages.
- Comparative market analysis (CMA). An agent’s written comparison with nearby sales and active listings, usually free and used to set a list price.
- Automated valuation model (AVM). A computer model that uses public records and sales data, such as the estimates shown by listing sites. It cannot see condition.
Limits of this method
A price-per-square-foot figure assumes every square foot is worth the same, which is rarely true: a large home usually sells for less per foot than a small one, and a finished basement is not worth as much as upper-floor space. Use the range, not the single number, and confirm important decisions with an appraisal or an agent’s CMA. See also the loan-to-value calculator for what your value means for borrowing.
How to use the Home Value Calculator
- Enter the home’s size. Use finished living area in square feet, as shown on a listing or tax record.
- Add comparable prices per square foot. Find recent nearby sales, divide each sale price by its size, and enter one to three results. The calculator averages them.
- Adjust for condition and features. Use a negative percentage for a home needing repairs (for example −10%) and a positive one for upgrades. Use the dollar field for extras such as a larger lot or an extra bathroom.
- Pick a range and read the result. Choose ±3%, ±5% or ±10% depending on how close your comparables are. The result shows one estimate and one range.
Formula and how it works
Example with real numbers
Here is the Home Value Calculator using the default values shown in the calculator above:
Inputs
| Home size (sq ft) | 1,800 |
|---|---|
| Comparable price per sq ft ($) | 225 |
| Second comparable price per sq ft (optional, $) | 0 |
| Third comparable price per sq ft (optional, $) | 0 |
| Condition adjustment (%) | 0 |
| Other adjustments for bedrooms, bathrooms, lot or upgrades ($) | 0 |
| Range around the estimate | ±5% (typical) |
Results
| Estimated value | $405,000.00 |
|---|---|
| Likely value range | $384,750 – $425,250 |
| Price per sq ft used | $225.00 |
With these inputs the calculator returns Estimated value: $405,000.00. Change any value in the calculator to see how the result moves.
What if you change one input?
Sensitivity check: raising Home size (sq ft) from 1,800 to 2,160 (about 20% higher) and leaving everything else as in the example above changes the results like this:
| Result | Example | After the change | Change |
|---|---|---|---|
| Estimated value | $405,000.00 | $486,000.00 | +20% |
| Price per sq ft used | $225.00 | $225.00 | 0% |
The input that moves the result most is the one to check twice. Change it in the calculator above to test your own case.
What the results tell you
The large number is the single best estimate: size × average price per square foot, adjusted for condition and any dollar adjustments. Likely value range shows the low and high ends together, so you can see the spread instead of a false single price. Price per sq ft used is the average of the comparables you entered. A wide range means your comparables are few or old, so get an agent’s CMA or an appraisal before relying on it.
Tips for better results
Worked examples: normal, repairs and upgrades
Formula: size × price per sq ft × (1 + adjustment ÷ 100). For a 1,800 sq ft home with comparables at $225 per sq ft and a ±5% range:
| Case | Adjustment | Estimate | Range (±5%) |
|---|---|---|---|
| Similar to the comparables | 0% | $405,000 | $384,750 – $425,250 |
| Needs repairs and updating | -10% | $364,500 | $346,275 – $382,725 |
| Recent upgrades | +5% | $425,250 | $403,988 – $446,513 |
The −10% case shows how condition matters: the same house with deferred repairs is estimated $40,500 lower. If you know the repair bill, you can enter it in the dollar adjustment field instead of using a percentage.
Method and limits. This tool multiplies and averages; it does not look at your home or the local market. It is an estimate for planning, not an appraisal, and not an offer or opinion of value from a licensed professional.
Frequently asked questions
What are comparables?
Comparables are similar homes that sold recently nearby. Their sale prices, converted to price per square foot, show what buyers are paying for homes like yours.
How do I find the price per square foot?
Divide a comparable home’s sold price by its living area in square feet. For example, $450,000 ÷ 2,000 sq ft = $225 per sq ft.
How is this different from an appraisal?
An appraisal is done by a licensed appraiser who inspects the home. It is what lenders use. This calculator is a quick estimate from numbers you enter and has no inspection.
How is it different from a CMA or an AVM?
A CMA is an agent’s comparison with nearby sales and listings. An AVM is a computer model, like the estimates on listing sites. This calculator uses only the comps you give it.
What should the condition adjustment be?
0% means similar to the comparables. A home needing repairs might be −10%; one with new kitchen and roof might be +5%. Estimate repair costs and compare them with the percentage.
Why does the calculator show a range?
Price per square foot is approximate. Showing a range, such as $384,750 – $425,250, is more honest than one exact number.
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