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Real Estate Investing Calculators

10 tools for underwriting a deal before you commit capital.

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Rental property analysis depends on getting operating expenses right, and that's where most first deals go wrong. Vacancy, maintenance, capital expenditure reserves, and property management typically consume 35–50% of gross rent. A deal that pencils on rent minus mortgage almost always loses money in practice.

Which metric matters depends on how you're financing. Cap rate ignores financing entirely and compares properties on their own merits. Cash-on-cash measures return on the money you actually put in. DSCR is what the lender cares about, since it determines whether the deal qualifies at all.

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Underwrite a rental

Full analysis including operating expenses, vacancy allowance, and reserves. Start here before using any of the single-metric tools.

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Core return metrics

Cap rate compares properties independent of financing. Cash-on-cash reflects leverage and shows return on your actual cash in. Yield measures rent against price.

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Financing and qualification

DSCR loans qualify on the property's income rather than yours. Each lender sets its own minimum ratio; interest-only structures raise the ratio by removing principal from the debt service figure.

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Strategy-specific

BRRRR depends on the refinance appraisal supporting your rehab spend. House hacking offsets your own housing cost with tenant rent. Flips live or die on accurate rehab budgets and holding costs.

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Common questions

Short answers to what people ask most before picking a tool.

What's a good cap rate?
It depends entirely on market and risk. Class A properties in major metros often trade at 4–5%, while Class C in secondary markets might be 8–10%. A higher cap rate signals higher return and higher risk, not a better deal. Compare only against similar properties in the same submarket.
What DSCR do lenders require?
Each lender sets its own minimum, usually above 1.0 so that net operating income covers debt service with some headroom; ask your lender for its figure. Below 1.0 the property doesn't cover its own debt and you're funding the shortfall monthly.
How much should I budget for operating expenses?
The 50% rule is a rough screen — assume half of gross rent goes to operating expenses excluding the mortgage. Actual figures vary with property age, management, and local taxes, but budgeting 5–10% for vacancy, 5–10% for maintenance, 5–10% for capital reserves, and 8–10% for management is more realistic than most first-time projections.
Does the 1% rule still work?
The rule — monthly rent should be at least 1% of purchase price — is a quick screen, not an analysis. It's become hard to satisfy in most appreciating markets, and passing it doesn't guarantee cash flow once real expenses and current interest rates are applied. Use it to filter listings, then underwrite properly.

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