An accurate after-repair value (ARV) estimate helps you decide what to pay for a property before renovation costs, financing, and resale risk are committed. This practical ARV calculator guide explains how to select comparable sales, make reasonable adjustments, build conservative assumptions, apply the 70 percent rule carefully, and test whether a fix-and-flip deal still works when the numbers change.
Overview
ARV is the estimated market value of a property after the planned renovation is complete. It is not the property's current value, the seller's asking price, or the highest nearby sale. It is a forward-looking estimate based on what similar, finished homes have recently sold for and how closely those homes match the proposed finished property.
ARV matters because it influences nearly every part of a house flipping decision. It helps establish a resale price, determine a maximum purchase offer, evaluate financing, and decide whether the planned scope is appropriate for the neighborhood. A weak ARV estimate can make a property appear profitable even when a modest resale-price reduction or repair overrun eliminates the margin.
Use ARV as a range rather than a single guaranteed number. A useful worksheet can include:
- Low ARV: a conservative outcome based on less favorable but still realistic comparable sales.
- Target ARV: the most supportable estimate if the renovation is completed as planned.
- High ARV: an optimistic scenario that should not be required for the deal to work.
Keep the ARV analysis separate from the renovation budget. A property may support a high resale value, but excessive improvements can still produce a poor return. For the complete project math, pair this analysis with the House Flip Budget Calculator and the House Flipping Calculator Guide.
How to estimate ARV step by step
1. Define the finished property
Before reviewing sales, write down what the home will be after renovation. Record the expected finished square footage, bedroom and bathroom count, parking, layout, quality level, major systems, exterior condition, and features such as a garage, basement, deck, or usable yard. Include only improvements that are reasonably achievable within the budget and local buyer expectations.
This step prevents a common mistake: comparing the current property to homes that are substantially better in ways your project will not address. If the subject will have a basic cosmetic renovation, do not use fully rebuilt or unusually customized homes as the primary evidence for value.
2. Select relevant comparable sales
Comparable sales, or “comps,” should resemble the finished property in location, property type, size, age, condition, layout, and buyer appeal. Start with the immediate neighborhood when possible, then expand the search only when there are too few reliable examples.
Prioritize closed sales over active listings. An active listing shows an asking price, not what a buyer ultimately paid. Pending sales may provide useful context, but their final terms and price may not be known. Review several sales rather than anchoring the estimate to one unusually high or low result.
For each comp, record the sale date, sale price, living area, lot, bed and bath count, parking, renovation quality, and any features that differ from the subject. Note whether the comp appears move-in ready, partially updated, or in need of work. The goal is not to find a perfect match; it is to understand the range supported by the market.
3. Compare price per square foot carefully
Price per square foot can be a helpful screening tool, but it should not be the entire ARV calculator. Two homes with similar area can have different values because of layout, lot position, natural light, parking, condition, school boundaries, additions, or functional obsolescence. Use the metric to identify patterns, then examine the actual differences between properties.
4. Make explicit adjustments
Adjust the analysis for meaningful differences rather than making vague statements that one home is “nicer.” A comp with an extra bathroom, garage, finished basement, newer roof, or superior lot may support a different value from the subject. Document the reason for each adjustment and use a conservative judgment when the market does not provide clear evidence.
Do not add the full renovation cost of a feature to the ARV automatically. Construction cost and market value are not the same. A $20,000 project may add less than $20,000 to resale value, while a required repair may protect value without creating an equal premium. The relevant question is how buyers value the finished difference in that specific market.
5. Build a value range
After reviewing the comps, establish a low, target, and high ARV. The target should be supported by multiple comparable sales and a renovation scope you can realistically deliver. Use the low case for offer and financing decisions when the downside would be difficult to absorb. Treat the high case as a sensitivity scenario, not as the foundation of your profit projection.
Inputs and assumptions for an ARV worksheet
A repeatable worksheet makes it easier to update the analysis as new information arrives. Include these inputs:
- Subject property: address or area, current size, lot, bed and bath count, parking, age, layout, and known condition.
- Finished scope: planned improvements, quality level, system replacements, permits, and features that will remain unchanged.
- Comparable sales: sale price, date, size, condition, features, location, and reasons for inclusion.
- Adjustment notes: the differences between each comp and the finished subject.
- ARV scenarios: low, target, and high values with the evidence supporting each.
- Sale assumptions: likely marketing period, selling costs, concessions, and the possibility of a price reduction.
- Risk notes: uncertain permits, structural or system issues, appraisal risk, unusual layouts, and market changes.
Keep selling costs outside the ARV itself. ARV describes the expected gross market value; agent compensation, closing costs, concessions, taxes, insurance, utilities, loan interest, and other holding costs reduce the amount left after sale. Include those items in the overall deal analysis rather than subtracting them from the comp values.
The 70 percent rule is a screening shortcut commonly expressed as: maximum purchase price = ARV × 70% − estimated repairs. It can provide a quick first pass, but it is not a universal investment rule or a substitute for a full budget. The appropriate margin depends on financing terms, transaction costs, project duration, local demand, risk, and the investor's required return. A safer analysis calculates the purchase price from the complete project budget and then uses the 70 percent rule only as a comparison.
For a more detailed purchase-price framework, see the Maximum Allowable Offer Calculator. If the deal depends on a high ARV, minimal holding time, or a perfect renovation, label that dependency clearly before making an offer.
Worked ARV and deal-analysis examples
Example 1: A supported target ARV
Suppose a two-story home will have three bedrooms, two bathrooms, updated finishes, functional systems, and ordinary but clean landscaping after renovation. Three nearby renovated sales suggest finished values of $355,000, $365,000, and $375,000. The highest sale has a larger garage and a better lot, while the lowest sale is slightly smaller and has a less functional layout.
After accounting for those differences, a reasonable worksheet might show:
- Low ARV: $350,000
- Target ARV: $360,000
- High ARV: $370,000
The target is not simply the average of the three prices. It reflects the subject's expected finished condition and the specific differences identified in the comp review. If the project budget requires a $370,000 sale to produce an acceptable return, the deal is more fragile than the target case suggests.
Example 2: Testing the 70 percent rule
Using a target ARV of $360,000 and estimated repairs of $55,000, the shortcut produces a maximum purchase price of $197,000: $360,000 × 0.70 − $55,000. That figure does not represent the final offer automatically. You still need to include financing costs, acquisition costs, permits, contingency, utilities, insurance, taxes, staging, selling costs, and the expected profit.
If the property will require a longer renovation or expensive financing, the full analysis may support a purchase price below the shortcut. If the property is unusually low risk and the project is simple, the result may differ. The key is to understand why the numbers differ rather than treating the rule as a guarantee.
Example 3: Sensitivity testing
Run the deal at the low ARV, target ARV, and high ARV. Then test a repair overrun, a longer hold period, and a lower final sale price. For example, ask what happens if the target resale price is reduced by 5 percent, the renovation takes an additional month, or an inspection reveals an unplanned electrical or foundation repair. If one ordinary setback turns the projected profit negative, revisit the offer, scope, financing, or decision to proceed.
When to recalculate ARV
ARV should be revisited whenever the information supporting it changes. Recalculate before making an offer if a newer comparable sale closes, a competing listing enters the market, or the property is revealed to have a different layout or condition than expected.
Update the estimate during renovation when the scope changes. A decision to remove a bedroom, add a bathroom, replace a major system, or use a higher or lower finish level can change the appropriate comp set. Revisit it before listing as well, because current competition and recent closed sales may support a different pricing strategy than the original underwriting.
Use this final action checklist:
- Describe the finished property in writing.
- Collect several relevant closed sales and document why each belongs in the analysis.
- Adjust for condition, size, layout, lot, parking, systems, and major features.
- Set low, target, and high ARV scenarios.
- Run the complete budget, including contingency, holding costs, financing, and selling costs.
- Test a lower sale price, higher repairs, and longer timeline.
- Recalculate before offering, after inspections, when scope changes, and before listing.
For pricing decisions after the renovation is complete, review How to Price a Flip for Sale. ARV is most useful when it remains a documented, revisable estimate—not a number chosen to make a deal look profitable.
