Financial

Rental Property Calculator

Use OmniCalc's rental property calculator to estimate monthly cash flow, cap rate, DSCR, and cash-on-cash return for a financed rental investment.

Rental property calculator

Estimate financed rental-property cash flow, cap rate, and cash-on-cash return.

Use purchase price, upfront cash, rent, vacancy, operating expenses, and financing terms to estimate monthly cash flow and core rental underwriting metrics.

Effective rent = monthly rent × (1 − vacancy rate).
Monthly cash flow after debt = effective rent − operating expenses − mortgage payment.
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Why this result matters

What this calculator helps you answer

A financed rental-property underwriting tool focused on vacancy, operating expenses, mortgage burden, cap rate, and cash-on-cash return rather than appreciation-led exit math. Use the tool above to enter a few clear inputs and get a practical answer you can use right away.

This rental property calculator helps investors pressure-test a financed deal with vacancy, operating costs, mortgage payments, and upfront cash needs. It stays distinct from the broader real estate calculator by centering rental underwriting and ongoing cash flow instead of hold-period appreciation and sale proceeds.

Formula and method

How the calculation works

The calculator reduces rent by vacancy, subtracts operating expenses to estimate NOI, subtracts mortgage payments to estimate cash flow after debt, then calculates cap rate, cash-on-cash return, DSCR, and gross rent multiplier.

Example

Example rental underwriting check

If an investor is comparing a financed rental deal, the calculator shows whether the rent can comfortably cover operations and debt service while also producing an acceptable cash-on-cash return.

FAQ

Common questions about this calculator.

Short answers to the questions people often ask before or after using the tool.

Question

How is this different from the real estate calculator?

The real estate calculator is broader and leans on appreciation, hold period, and exit proceeds. This page is tighter: it focuses on financed rental underwriting and monthly cash flow.

Question

What is cash-on-cash return?

Cash-on-cash return compares annual cash flow after debt to the actual cash you had to invest up front, such as down payment, closing costs, and renovation budget.

Question

Does DSCR matter?

Yes. DSCR is a common lender metric that compares NOI to annual debt service and helps show whether the property can support its mortgage burden.

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