Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Real Estate & Housing
ADU House-Hack ROI Calculator
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Inputs
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Smart analysis
Recommendations
Tailored to your live inputs and result—guidance only, not professional advice.
- Interpret
Treat this as a planning estimate
Primary result: Year-1 cap rate = 11.63%. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.
Scenario studio
Compare A vs B
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Scenario A
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Scenario B
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Pro strategic insights
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Build cost
One-time or recurring costs that affect total money paid.
Monthly rent
The “Monthly rent ($)” value used in this tool’s formula. Adjust it to see results update live.
Vacancy (%)
The “Vacancy (%)” value used in this tool’s formula. Adjust it to see results update live.
Monthly operating cost
One-time or recurring costs that affect total money paid.
- buildCost
Build cost ($)
The “Build cost ($)” field. Default 180000; typical range 1000–2000000.
- monthlyRent
Monthly rent ($)
The “Monthly rent ($)” field. Default 2100; typical range 0–20000.
- monthlyOpex
Monthly operating cost ($)
The “Monthly operating cost ($)” field. Default 250; typical range 0–10000.
NOI = rent × 12 × (1 − vacancy%) − opex × 12. Cap rate = NOI ÷ build cost.
Turn ADU build cost, rent, vacancy, and operating costs into Year-1 NOI and an unlevered cap rate.
How this calculator works
Turn ADU build cost, rent, vacancy, and operating costs into Year-1 NOI and an unlevered cap rate. NOI = rent × 12 × (1 − vacancy%) − opex × 12. Cap rate = NOI ÷ build cost. Scenario: $180,000 ADU, $2,100 rent, 5% vacancy, $250/month opex → NOI about $20,940, cap rate about 11.6%.
NOI = rent × 12 × (1 − vacancy%) − opex × 12. Cap rate = NOI ÷ build cost.
Scenario: $180,000 ADU, $2,100 rent, 5% vacancy, $250/month opex → NOI about $20,940, cap rate about 11.6%.
When to use this ADU House-Hack ROI
Common use cases
- Turn ADU build cost, rent, vacancy, and operating costs into Year-1 NOI and an unlevered cap rate.
- Sanity-check with this scenario: $180,000 ADU, $2,100 rent, 5% vacancy, $250/month opex → NOI about $20,940, cap rate about 11.6%.
- The relationship is: NOI = rent × 12 × (1 − vacancy%) − opex × 12. Cap rate = NOI ÷ build cost.
Localized examples
- Real Estate & Housing: the example on this page uses the same formula as the widget.
What you get
- Fields: Build cost ($), Monthly rent ($), Vacancy (%), Monthly operating cost ($)
- NOI = rent × 12 × (1 − vacancy%) − opex × 12. Cap rate = NOI ÷ build cost.
- Scenario on the page: $180,000 ADU, $2,100 rent, 5% vacancy, $250/month opex → NOI about $20,940, cap rate about 11.6%.
How to Calculate ADU House-Hack ROI
- 1Enter Build cost ($), Monthly rent ($), Vacancy (%), then the remaining fields. Use the values you have, not a catalog average, unless that is all you know.
- 2NOI = rent × 12 × (1 − vacancy%) − opex × 12. Cap rate = NOI ÷ build cost.
- 3Scenario: $180,000 ADU, $2,100 rent, 5% vacancy, $250/month opex → NOI about $20,940, cap rate about 11.6%.
- 4Use it to compare habits, not to book a retirement party. Change one assumption and see which year moves.
Governing formula
NOI = rent × 12 × (1 − vacancy%) − opex × 12. Cap rate = NOI ÷ build cost.
$180,000 ADU, $2,100 rent, 5% vacancy, $250/month opex → NOI about $20,940, cap rate about 11.6%.
$180,000 ADU, $2,100 rent, 5% vacancy, $250/month opex → NOI about $20,940, cap rate about 11.6%.
Variable definitions
- buildCost
Build cost ($)
The “Build cost ($)” field. Default 180000; typical range 1000–2000000.
- monthlyRent
Monthly rent ($)
The “Monthly rent ($)” field. Default 2100; typical range 0–20000.
- vacancyPercent
Vacancy (%)
The “Vacancy (%)” field. Default 5; typical range 0–40.
- monthlyOpex
Monthly operating cost ($)
The “Monthly operating cost ($)” field. Default 250; typical range 0–10000.
- The estimate (NOI = rent × 12 × (1 − vacancy%) − opex × 12. Cap rate = NOI ÷ build cost.) is for a meeting, not a signed forecast. Check the invoice or the contract.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
NOI = rent × 12 × (1 − vacancy%) − opex × 12. Cap rate = NOI ÷ build cost.
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4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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