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Investment Property Calculator: Analyze Any Deal in 5 Minutes

October 2026 • 6 min read

You don't need a 50-row spreadsheet to evaluate a property deal. You need 4 numbers: purchase price, expected monthly rent, estimated monthly expenses, and your down payment. From these, you can calculate every metric that matters.

The Formula

The 4 numbers: Price, Rent, Expenses, Down Payment. From these: NOI = (Rent - Expenses) x 12. Cap Rate = NOI / Price. Cash Flow = Rent - Expenses - Mortgage. Cash-on-Cash = (Cash Flow x 12) / Down Payment.

Real-World Example

Quick deal analysis: $300,000 property, $2,200/month rent, $800/month expenses (taxes, insurance, maintenance), $60,000 down payment. NOI: ($2,200-$800) x 12 = $16,800. Cap Rate: $16,800/$300,000 = 5.6%. Mortgage (240K at 5.5%): ~$1,460. Cash flow: $2,200-$800-$1,460 = -$60/month. Wait - negative cash flow? This deal doesn't work with 20% down. Try 25% down or negotiate a lower price.

Mozongi REMA Dashboard

The Bottom Line

Mozongi REMA runs this analysis automatically when you add a property. Enter the purchase price, down payment, mortgage terms, and income - the Financial Analysis tab shows everything in seconds.

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