The 5 Most Important Calculators Every Real Estate Investor Should Use

Whether you’re analyzing your first rental or scaling a portfolio, running the numbers is non-negotiable. The difference between a profitable deal and a money pit often comes down to one thing: the calculator you used before making an offer.

At Faas Funding, we’ve built a free suite of investor-grade calculators designed to help you underwrite deals faster and with more confidence. Here are the five most important ones every investor should have bookmarked.

1. DSCR Calculator

The Debt Service Coverage Ratio is the single most important metric lenders look at when qualifying an investment property loan. Our free DSCR Calculator lets you plug in your rental income, loan terms, taxes, and insurance to instantly see whether your deal qualifies. If your DSCR is 1.25 or above, you’re in strong territory. Below 1.0? Walk away or renegotiate.

2. BRRRR Calculator

The Buy, Rehab, Rent, Refinance, Repeat strategy is how serious investors scale. But it only works if the math checks out at every stage. Our BRRRR Calculator walks you through purchase price, rehab costs, ARV, rental income, and refinance terms so you can see your cash-on-cash return and equity position before you commit a dollar.

3. Fix & Flip Calculator

Flipping a property without running a detailed profit analysis is gambling, not investing. The Fix & Flip Calculator factors in acquisition cost, renovation budget, holding costs, selling expenses, and ARV to give you a clear picture of your projected net profit and ROI. Use it before every offer.

4. Rental Property ROI Calculator

Cash flow is king in buy-and-hold investing. A rental property ROI calculator helps you evaluate monthly cash flow, cap rate, and long-term returns across your entire portfolio. Understanding these metrics means you can compare deals objectively rather than relying on gut feeling.

5. Hard Money Loan Calculator

Hard money and bridge loans are essential tools for investors who need to move fast. Knowing your monthly payments, total interest costs, and points upfront prevents surprises at closing. A dedicated hard money calculator ensures you’re accounting for the true cost of short-term financing.

Access All Tools in One Place

All of these calculators (and more) are available for free on our Investor Tools page. No login required, no paywall. Just plug in your numbers and get instant results with a deal verdict that tells you whether to move forward.

Ready to run your next deal? Explore all free investor calculators here.