Creating an apples-to-apples portfolio comparison
Set values for properties A and B as of the same date and use one valuation basis. A historical acquisition price for one asset and a current estimate for the other do not support a meaningful current cap-rate comparison. Document whether each value comes from a transaction, appraisal, or user scenario.
Define NOI consistently across both assets, including the treatment of vacancy, management, reserves, reimbursements, and owner-paid costs. The calculator accepts the totals you provide and cannot detect when one statement omits a recurring expense that appears in the other.
Property and combined cap rates
Each cap rate divides that property’s NOI by its value before financing. It is an operating snapshot, not an equity return. The combined cap rate divides combined NOI by combined value, so larger assets carry more weight than smaller ones.
Do not average the two displayed percentages unless equal weighting is actually the question. A value-weighted combined rate answers how the selected property pool performs in aggregate on the entered value basis, while the individual rates reveal dispersion within it.
Cash flow, current equity, and leverage
Annual cash flow should be measured after debt service for cash-on-cash analysis. Current equity represents capital tied to the asset on the same date, rather than automatically the original down payment. Principal paydown and value changes can make those amounts diverge over time.
Leverage can increase or decrease the equity cash-flow ratio without changing property NOI. Review debt balance, rate, maturity, and coverage separately. This page does not calculate a combined DSCR because aggregating obligations may conceal asset-specific covenants and nonrecourse structures.
Portfolio risk not captured by simple aggregation
Adding cash flow does not measure diversification. Properties can share geographic, employer, tenant, interest-rate, insurer, or regulatory exposure. A portfolio with more assets can still be concentrated if the same factor drives their income and value.
Lease rollover, deferred capital work, liquidity, and ownership restrictions can also dominate a decision without appearing in cap rate. Keep a qualitative risk register and dated capital plan beside the numerical comparison rather than forcing every difference into one return percentage.
Scenario analysis for two properties
Start with a documented current case, then apply a common vacancy or expense stress to both properties. After that, test asset-specific events such as a lease expiration, renovation, insurance renewal, loan maturity, or sale. This separates market-wide exposure from property-level execution.
EstateCalc does not rank the assets or supply market data. The outputs describe the inputs and should be reviewed with evidence for value, NOI, cash flow, equity, liquidity, and the investor’s own constraints.
Real Estate Portfolio Calculator FAQ
How does the portfolio calculator combine cap rates?
It adds NOI for A and B and divides by their combined value. This is value-weighted and is not the simple average of the two percentages.
What equity should I enter?
Use investor equity currently tied to each property as of the measurement date, using a consistent definition for A and B.
Does combined cash flow measure diversification?
No. It is only the sum of two annual cash flows. Correlation, concentration, liquidity, and common risk drivers require separate analysis.
Why can cap rate and cash-on-cash move differently?
Cap rate ignores financing, while cash-on-cash uses cash flow after debt service and current investor equity.
Can I compare different property types?
Yes for transparent arithmetic, but account separately for differences in leases, expenses, capital needs, liquidity, and risk before drawing conclusions.
Continue the property analysis
Compare this result with adjacent metrics, keeping each formula’s income, expense, and financing scope consistent.