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Comps Adjustment Calculator

A raw comp isn't directly comparable — you need to adjust for differences. This calculator adds or subtracts for sq ft, bedrooms, baths, garage, and condition to produce an adjusted value that truly compares to your subject property.

Comp sale price

Comp sq ft

Subject sq ft

Bed diff (subject - comp)

Bath diff (subject - comp)

Garage diff (subject - comp, bays)

Condition adjustment %

Adjusted comp value

$434,300

comparable to subject

Total net adjustment

$14,300

Sq ft adjustment

$14,300

Bedroom adjustment

Bathroom adjustment

Garage adjustment

Condition adjustment

How the math works

Real comps require adjustments for differences between subject and comparable. Appraisers use market-paired adjustment tables for each feature. Rules of thumb: $100-120/sq ft, $4-6k per bedroom, $5-8k per bathroom, $6-10k per garage bay — varies heavily by market.

Condition adjustment is the trickiest — scale -30% (distressed) to +15% (fully renovated). Use 3-5 adjusted comps and take the average. Discard outliers. Keep adjustment per comp under 15% to avoid over-manipulating values.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Comps Adjustment Calculator is built to give a quick, browser-based estimate for comps adjustment. A raw comp isn't directly comparable — you need to adjust for differences. This calculator adds or subtracts for sq ft, bedrooms, baths, garage, and condition to produce an adjusted value that truly compares to your subject property. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the comps adjustment result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this comps adjustment estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter the comp's sale price and square footage.
Enter your subject property's square footage.
Enter each bed, bath, garage differential.
Adjust for condition differences.

Frequently Asked Questions

Where do adjustment values come from?

Paired sales analysis in the market. Appraisers review pairs of similar homes where one has the feature and one doesn't, and market pricing reveals the adjustment. Values vary by market — urban adjustments differ from rural.

How many comps should I use?

3-5 adjusted comps for a reliable estimate. Discard outliers. Use closed sales within 90 days and within 0.5 miles when possible. Pending sales and active listings offer directional data but less reliable.

What's 'condition' exactly?

Overall quality and update level of finishes, mechanicals, and general appearance. Dated kitchen and bathrooms are the biggest drivers. -15 to -30% for distressed; -5 to -15% for dated; +5 to +15% for updated; +15% for fully renovated luxury.