Real estate calculators

Yes. They run in your browser and need no signup. The figures you enter are not saved or sent anywhere; Zero Flux only counts which calculator was used.

Each calculator opens with the worked example from its page, so the result matches the arithmetic in the text. Most are hypothetical; the NOI, cap rate and commercial DSCR calculators use the OCC lending handbook's published example. None is current market data. Replace them with your own figures.

No. Gross rent multiplier, price-to-rent ratio and absorption rate are screening ratios. They leave out expenses, financing and property condition. Fannie Mae, for example, does not accept an appraisal that relies solely on the income approach.

Use the rental property calculator. It takes price, loan terms, rent and expenses and returns monthly cash flow, cap rate, cash-on-cash return and DSCR. For a DSCR loan, check the lender's rent ÷ PITIA method in the DSCR calculator.

Use the price-to-rent ratio calculator for a quick screen of a home or a market. It leaves out mortgage rates, taxes, insurance and maintenance, so treat a high or low ratio as a prompt for a fuller cost comparison.

Use the absorption rate calculator. It returns months of supply, the measure NAR reports alongside existing-home sales. Cutoffs labeled buyer's or seller's markets are conventions that vary by area and property type, so compare a market with its own history.