Complete guide
Real Estate Calculator: formula, worked example and interpretation
Measure a property's net operating income, cap rate, cash flow and cash-on-cash return. Enter the known values and the result updates instantly with an auditable breakdown.
What the Real Estate Calculator answers
Measure a property's net operating income, cap rate, cash flow and cash-on-cash return.
Use the breakdown to compare the result with the source values before making a decision.
Formula and variables
The calculation uses NOI=effective rent−operating expenses; cap rate=NOI/price. Every variable comes directly from a labeled field.
NOI=effective rent−operating expenses; cap rate=NOI/priceWorked example
$3,000 monthly rent is adjusted for vacancy and operating costs before mortgage cash flow is shown.
Changing any field recalculates the result immediately, so nearby scenarios can be compared without reloading the page.
How to use the result
Treat the result as a planning value and compare it with the detailed rows shown beside it.
Keep units and time periods consistent. Use the share or PDF action to preserve the exact assumptions.
Assumptions and scope
Income taxes, appreciation, selling costs, reserves and irregular capital expenditures need separate scenario analysis.
The calculator exposes its assumptions instead of filling missing facts with hidden estimates.
Accuracy checks
Confirm the units, dates, rates and source figures before relying on the output.
Round only the displayed answer; Calculator24 keeps full JavaScript precision for intermediate arithmetic and exported values.
Input and output checklist
| Item | What to enter or review |
|---|---|
| Inputs | Purchase price ($), Down payment ($), Monthly rent ($), Vacancy (%), Monthly operating expenses ($), Monthly mortgage payment ($), Closing and initial costs ($) |
| Equation | NOI=effective rent−operating expenses; cap rate=NOI/price |
| Example | $3,000 monthly rent is adjusted for vacancy and operating costs before mortgage cash flow is shown. |
| Limit | Income taxes, appreciation, selling costs, reserves and irregular capital expenditures need separate scenario analysis. |
Frequently asked questions
What does this Real Estate Calculator calculate?
Measure a property's net operating income, cap rate, cash flow and cash-on-cash return.
Which formula does it use?
NOI=effective rent−operating expenses; cap rate=NOI/price
Does the result update while I type?
Yes. Valid changes recalculate after a short delay and the previous result is not substituted for invalid input.
Which assumptions should I check?
Check units, rates, dates and every source value shown in the form.
Is the result exact?
Income taxes, appreciation, selling costs, reserves and irregular capital expenditures need separate scenario analysis.
Can I save or share the calculation?
Yes. Copy, Share, WhatsApp, PDF/Print, CSV, comparison and parameterized-link actions are available.
What to keep in mind
Income taxes, appreciation, selling costs, reserves and irregular capital expenditures need separate scenario analysis.
Results display up to 8 decimal places; exported numbers preserve calculation precision. This is a calculation summary, not an official certificate.