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Property Cash Flow Calculator

Estimate a rental's monthly and annual cash flow. Enter rent and other income, a vacancy allowance, each operating expense and your mortgage payment to see cash flow, NOI and optional cash-on-cash return.

Written and reviewed by the CalcBundle editorial team. Transparent formulas · results are estimates, not advice.

Monthly income
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Monthly operating expenses
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Financing
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Monthly cash flow

Enter your rent and expenses to calculate cash flow.

What is a property cash flow calculator?

A property cash flow calculator shows whether a rental puts money in your pocket each month. It is the most practical test of a buy-and-hold deal: after every bill and the mortgage, what is left?

How cash flow is calculated

  • Effective income = (rent + other income) × (1 − vacancy)
  • Operating expenses = tax + insurance + maintenance + management + HOA + utilities + other
  • Cash flow = effective income − operating expenses − mortgage payment
  • NOI (annual) = (effective income − operating expenses) × 12

Turn cash flow into returns

Once you know cash flow, convert it into returns: the cash-on-cash return calculator measures it against your cash invested, and the rental property ROI calculator adds appreciation and sale proceeds for a full-hold return.

Frequently asked questions

What is rental property cash flow?

Cash flow is the money left each month after collecting rent and paying all operating expenses and the mortgage. Positive cash flow means the property pays you; negative means it costs you out of pocket.

What expenses should I include?

Include property tax, insurance, maintenance, property management, HOA, utilities you cover, and any other recurring costs — plus your mortgage payment as debt service. A vacancy allowance makes the estimate more realistic.

Is the mortgage part of operating expenses?

No. Operating expenses and debt service are kept separate. NOI is calculated before the mortgage, and the mortgage is then subtracted to reach cash flow, so principal is not treated as a running cost.

How is cash-on-cash return calculated here?

If you enter the cash you invested, the calculator divides annual cash flow by that amount to show a cash-on-cash return alongside the monthly and annual cash flow.

Related calculators

Cash-on-Cash Return

Measure annual pre-tax cash flow against the cash you actually invested.

Cap Rate

Compute capitalization rate from NOI and value, or solve for value or NOI.

Rental Property ROI

Estimate cash flow, cash-on-cash and total ROI for a financed rental, including sale.

DSCR

Work out debt service coverage ratio, or the debt supportable at a target DSCR.

Disclaimer. This calculator provides estimates for informational purposes only. Results are based on the information you enter and the assumptions used by the calculator. Actual financial, tax, business valuation, lending, marketplace or investment outcomes may differ. Consider consulting a qualified professional for decisions involving significant amounts of money. Results are pre-tax estimates based on the figures you enter and do not account for income taxes or irregular capital expenses.