Real Estate & Property calculators

Which real estate calculator should you use first?

The right starting point depends on whether you are buying, investing, or evaluating an existing property. First-time buyers should start with the House Affordability Calculator to understand what price range your income and debt levels support before approaching a lender. Property investors should run the Rental Property ROI Calculator alongside the Cap Rate Calculator — together, these two tell you whether a deal is worth pursuing in the first five minutes.

If you are financing with a mortgage, the DSCR Calculator tells you whether the rental income will qualify you for a DSCR loan (lenders typically require DSCR ≥ 1.25). For comparing markets or properties quickly, the Gross Rent Multiplier (GRM) and Rental Yield Calculator are fast screening tools that require minimal data.

Core real estate investment metrics explained

Cap rate (capitalisation rate)

Cap rate = Net Operating Income (NOI) ÷ Property value. NOI is annual rental income minus operating expenses (insurance, taxes, maintenance, management fees), before debt service. A 6% cap rate means you earn 6 cents of NOI for every dollar of property value. Cap rates vary significantly by market and property type — single-family homes in expensive markets often show 3–4%; multi-family in secondary markets may offer 6–8%.

Cash-on-cash return

Cash-on-cash = Annual pre-tax cash flow ÷ Total cash invested. Unlike cap rate, cash-on-cash accounts for your mortgage payments, so it reflects what your actual cash earns. A property might show an 8% cap rate but only a 4% cash-on-cash return if heavily leveraged. Most investors target at least 8–10% cash-on-cash to justify the illiquidity of real estate.

DSCR (Debt Service Coverage Ratio)

DSCR = Annual NOI ÷ Annual debt service. A DSCR above 1.0 means the property generates more income than it costs to finance. DSCR lenders typically require 1.20–1.25 minimum. If your DSCR is below 1.0, the property has negative cash flow — you are subsidising it from other income.

Gross Rent Multiplier (GRM)

GRM = Property price ÷ Annual gross rent. A property selling for $400,000 that rents for $2,500 per month ($30,000 per year) has a GRM of 13.3. Lower GRM generally means better value. GRM does not account for expenses or vacancies, which is why it is a screening tool only — follow up with a full cash flow analysis on deals that pass the GRM threshold.

Common real estate investing mistakes

• Using gross yield instead of net yield. A 10% gross rental yield sounds attractive until you subtract vacancy (5–10%), property management (8–12%), maintenance (1–2% of value per year), insurance, and taxes. Net yields are frequently 40–50% lower than gross yields.
• Ignoring vacancy and maintenance in cash flow projections. Assume at least 5% vacancy and budget 1% of property value annually for maintenance. A single roof replacement or HVAC failure can wipe out two years of cash flow.
• Confusing appreciation with cash flow. Banking on price appreciation to justify a negative cash flow property is speculative, not investing. Cash flow pays the bills; appreciation is a bonus.
• Not accounting for closing costs and holding costs in ROI. Buying and selling real estate costs 6–10% of the property value in commissions, taxes, and fees. A property needs to appreciate significantly before you break even on a short hold.

When to use these calculators and when to hire a professional

These tools are best used for initial screening and deal evaluation. Run them before committing time to deeper due diligence. They are also useful for stress-testing assumptions — what happens to your returns if rent drops 15%? If interest rates rise 1%?

Before closing on any property, hire a licensed property inspector, a local real estate attorney, and a CPA familiar with real estate tax law. The numbers these calculators produce are estimates based on the inputs you provide — they cannot account for local market conditions, property-specific issues, or regulatory changes.

Frequently asked questions