Real Estate Investment Calculator

Cap Rate and Cash-on-Cash Return, Explained

These are two of the most common quick-check metrics for evaluating an investment property. Cap rate measures return based on the property's full value, independent of financing — useful for comparing properties on equal footing. Cash-on-cash return measures the return on the actual cash you put in, so it reflects financing if you used a mortgage.

$$\text{Cap Rate} = \frac{\text{NOI}}{\text{Property Value}}, \quad \text{Cash-on-Cash} = \frac{\text{Cash Flow}}{\text{Cash Invested}}$$

Worked Example

On a 250,000-dollar property with 24,000 dollars in annual gross rental income and 7,200 dollars in annual operating expenses, net operating income comes to 16,800 dollars, for a cap rate of 6.72%. If the same property produces 9,600 dollars of annual pre-tax cash flow after debt service, on 60,000 dollars of total cash invested, the cash-on-cash return works out to 16%.

Why the Two Numbers Can Look So Different

Cap rate and cash-on-cash return answer different questions, so it's normal for them to land far apart on the same property. A leveraged purchase (a mortgage covering most of the price) often shows a cash-on-cash return well above the cap rate, since a relatively small amount of your own cash is generating the return on a much larger asset — that's the effect commonly called leverage, and it cuts both ways if rents fall or vacancy rises.

A Brief History of Cap Rate and Cash-on-Cash Return

Cap rate traces back to the income capitalization approach to property appraisal — valuing a property based on the income it produces rather than comparable sales or replacement cost. That approach became a standard part of US commercial real estate appraisal practice over the course of the 20th century, formalized through professional appraisal standards and organizations such as the Appraisal Institute as commercial real estate investing grew into a more institutional, data-driven business. Because cap rate is calculated independent of financing, it became the natural way to compare very different properties, and different buyers with different financing situations, on the same footing.

Cash-on-cash return developed alongside it as a simpler, more investor-facing metric, gaining traction as leveraged real estate investing — buying property with a mortgage rather than cash — became widely accessible to individual investors rather than only institutional buyers. Where cap rate answers "how does this property perform on its own," cash-on-cash answers the more personal question an individual investor actually cares about: how hard is my own cash working, given how I chose to finance the deal.

Common Mistakes When Evaluating a Rental Property

Comparing a leveraged property's cash-on-cash return directly against an all-cash property's cap rate is an apples-to-oranges mistake — always compare cap rate to cap rate, and cash-on-cash to cash-on-cash. Underestimating operating expenses (skipping vacancy allowance, deferred maintenance, or property management fees) is another common error that makes a property look more profitable on paper than it will be in practice — use the optional Vacancy Allowance field above so vacancy is never quietly left out.

This Calculator vs. the Rental Property ROI Calculator

This page focuses on cap rate and cash-on-cash return, which start from a lump "cash invested" figure and a pre-tax cash flow you already know. If your total investment is more naturally described as purchase price plus closing costs and renovation costs, or you'd rather see a single ROI figure derived from those pieces, the Rental Property ROI Calculator is built for that instead.

Real Estate Investment Terms You Should Know

Net Operating Income (NOI) — gross rental income minus operating expenses, before any mortgage payment is subtracted.

Cap Rate — NOI divided by property value, expressed as a percentage; a financing-independent measure of return.

Cash-on-Cash Return — annual pre-tax cash flow divided by total cash invested; reflects the effect of any financing used.

Leverage — using borrowed money (a mortgage) to control a larger asset than your own cash alone would buy, which can amplify both gains and losses.

This calculator provides estimates for educational and planning purposes only. Actual returns depend on financing terms, vacancy, maintenance, taxes, and market conditions that can't be fully captured in a simple cap rate or cash-on-cash figure. Consult a qualified financial advisor or real estate professional before making an investment decision.