Underwrite
Rental property analysis calculator
Analysis means the whole sheet, not one vanity metric. Enter purchase, rents, vacancy, expenses, and financing; get NOI, cap rate, cash flow, CoC, and optional rule-of-thumb flags in one pass. Same engine family as the hub calculator - this page speaks "analysis / analyzer" search language and keeps copy distinct so you're not serving two identical shells.
Assumptions
Returns stack
- NOI
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- Cap rate
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- Monthly CF
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- Cash-on-cash
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- Cash invested
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When to use
Formal first-pass memo to a partner; replacing a brittle spreadsheet; one-tab review before you commission a deeper model.
When not to
Not Zillow rent or an AVM. And year-one analysis is not a 10-year projection - don't treat one pass as a lifetime model.
Assumptions: Full stack: EGI → NOI → cap → CF → CoC. Optional flags for 1% rule, expense ratio, DSCR when debt entered. No comps by address, no tax module.
Worked examples
Input
Complete stack on $310k 3bed Vacancy rises
Output
See which metric fails first
One sheet shows where the deal breaks under stress.
Input
Same deal · +0.5% rate
Output
CF and CoC move together
Cap rate unchanged; levered metrics feel the rate bump.
Common traps
- Not Zillow rent or an AVM.
- Don't duplicate hub page verbatim in UI chrome - shared math, different framing.
- Year-one analysis is not 10-year projection.