Every property number is an estimate, and valuation is the discipline of knowing which method produced it and what that method can mislead you about. Comparable sales, income capitalization and price-per-area each answer a different question, and professionals cross-check one against another rather than trusting a single figure.
What this topic covers
- Cap rate as a pricing tool: reading it, and running it in reverse from income to value.
- Price per square foot and per square meter: exact conversions, and what the number hides.
- Effective gross income: the honest bridge between scheduled rent and NOI.
- The limits of each method, and how to combine them into a defensible view of value.
Three methods, three different questions
The comparable-sales method asks what similar properties actually traded for, and it works best where sales are frequent and properties similar. The income method asks what the property's income stream is worth to an investor, capitalizing NOI at a market cap rate. The cost or replacement approach asks what it would cost to rebuild, which anchors insurance and special-purpose properties. Each has a blind spot: comparables lag fast-moving markets, income approaches are only as honest as the rent roll, and replacement cost says nothing about what buyers will pay.
Running the cap rate in reverse
The income method is most useful as a pricing engine: value equals NOI divided by the cap rate. The arithmetic also shows how sensitive value is to that rate. A property producing 70,000 of NOI is worth 1,000,000 at a 7% cap rate but 1,166,667 at 6%, a swing of more than 166,000 from one percentage point. That sensitivity is why professionals state the cap rate they assumed next to every income-based value, and why small, defensible differences in the assumption matter more than false precision in the NOI.
What price per area hides
Price per square foot or square meter is the fastest normalizer between properties of different sizes, and measurement conventions differ, some markets quote gross floor area including balconies and common proportions, others quote net usable area, and a 10 to 20% definitional gap can masquerade as a bargain. It also ignores what buyers actually pay for: condition, layout efficiency, light, land share and location quality. Use it as a first filter, never as a verdict.
Key terms you will keep meeting
- Cap rate: NOI divided by value. See cap rate.
- Appraisal: the professional estimate lenders rely on. See appraisal.
- Effective gross income: scheduled rent minus vacancy and credit loss. See effective gross income.
- Price per square foot: price divided by floor area. See price per square foot.
- Valuation: the process of estimating worth. See valuation.
Cross-check a listing
Take any income property you are looking at: compute its cap rate in the cap rate calculator, then normalize its price with the price per area calculator. Two independent views beat one confident number.
Where to go next
Read cap rate explained and price per area comparison done right, then see how appreciation and compound growth interacts with valuation over time.