ROI Math
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Run the Numbers on Any Real Estate Deal

Underwrite a rental or commercial property in seconds. Calculate NOI, cap rate, mortgage payment, cash flow, DSCR, and cash-on-cash return without a spreadsheet or sign-up.

Analyze a Deal NowSee the 6-Step Method
  • Results update as you type
  • Inputs stay in your browser
  • Standard formulas shown
Investment Return Calculator
Live NOI, cap rate, financing, and cash-flow underwriting.
9.88% cap rate
$
$

Annual total: $42,000

Advanced
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NOI
$84,000
Cap rate
9.88%
Expense ratio
33.33%

Income allocation

Gross income, expenses, and net return split.

Operating expenses$42,000
Net operating income$84,000
Annual expenses
$42,000
Net operating income
$84,000

Instant results

Returns update as you change the deal assumptions.

Private by design

Your property numbers stay in your browser.

Transparent math

Standard formulas and limitations are shown in plain English.

Purpose-built tools

Choose the Calculator for Your Next Decision

Start with the live calculator above, or open a focused tool with formulas, examples, and answers for the metric you need.

Clear math, honest limits

Understand the Result, Not Just the Number

ROI Math pairs every tool with plain-English formulas, worked examples, and practical ranges. It is built by an independent real estate investor with more than 10 years of buy-and-hold experience, and it tells you when a fuller analysis tool is the better fit.

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