Rental Property Calculator Google Sheets [Free Template]
Analyzing a rental property before you buy is non-negotiable. A good spreadsheet model helps you stress-test assumptions, compare multiple deals, and avoid costly mistakes. Here's how to build — or use — a rental property calculator in Google Sheets.
Key Inputs for Any Rental Property Analysis
- Purchase Price: The acquisition cost
- Down Payment: Typically 25–35% for investment property
- Loan Amount & Interest Rate: Affects your annual debt service
- Gross Rents: Total monthly rent collected across all units
- Vacancy Rate: Estimate 3–5% for stabilized LA properties
- Operating Expenses: Property taxes, insurance, management, maintenance, utilities
Key Outputs You Should Track
- Net Operating Income (NOI): Gross Rents - Vacancy - Operating Expenses
- Cap Rate: NOI ÷ Purchase Price
- Cash-on-Cash Return: Annual Cash Flow ÷ Total Cash Invested
- GRM: Price ÷ Annual Gross Rents
- Annual Debt Service: Monthly payment × 12
A Simple Formula for LA Multifamily
In Los Angeles, a reasonable rule of thumb for a value-add multifamily deal: if the current cap rate is 4–5% on actuals but the market cap rate on pro forma rents is 6–7%, you have a value-add opportunity worth underwriting in detail.
Want a free underwriting consultation from Samimi CRE Advisors? Contact our team and we'll run the numbers with you.