1% rule calculator for rental property

Compare the same property three ways

Enter a purchase price, scheduled monthly gross rent and estimated monthly operating expenses. The calculator applies three screening comparisons: the one percent rent rule, a fifty percent operating-expense allowance and the gross rent multiplier. All three are rules of thumb rather than legal or underwriting standards.

The one percent comparison divides monthly rent by purchase price. It also shows the monthly rent equal to one percent of that price. Meeting the rule means the entered rent is at least that benchmark. It does not mean the property is profitable, fairly priced or suitable for a particular investor.

The fifty percent comparison treats half of scheduled rent as a rough operating-cost allowance, before borrowing and income tax. Your expense input is compared with that allowance. This makes the entered expense figure useful without turning a rough rule into an invented forecast of the property's actual bills.

Read the gross rent multiplier carefully

The gross rent multiplier, or GRM, is price divided by one year's scheduled gross rent. Monthly rent is multiplied by twelve first. For otherwise identical assumptions, a lower multiplier means a lower price relative to rent. It does not show the number of years needed to recover all invested cash because expenses, financing, tax and changes over time are ignored.

Enter price and rent for the same property and on the same ownership basis. Mixing the price of a whole building with rent from one unit gives a different and usually unhelpful comparison. Use rent before operating expenses. If rent includes services that another property's rent excludes, review the expense assumptions before comparing their multipliers.

Zero rent is accepted so the form can show that there is no current scheduled rental income. In that case GRM and an expenses-to-rent percentage are not defined. The screen includes no mortgage, tax liability, growth forecast or investment rating, and the fifty percent allowance is not a prediction of actual spending.

Use realistic expenses instead of a target

The operating-expense input should represent your estimate of recurring property costs on a monthly basis. Keep mortgage payments, depreciation and personal income tax outside that figure for this comparison. Convert annual bills consistently before entering a total. The calculator does not reconstruct the individual costs behind it or decide whether each estimate is realistic.

An expense total below fifty percent is simply below this allowance. Missing repairs, utilities or an association charge could make the estimate artificially low. Equally, expenses above the allowance do not prove that a property is unsuitable; a simple rule cannot assess condition, lease terms, risk or investment objectives.

The IRS rental-property source is provided for expense and tax context. It does not endorse either percentage as an investment test. Tax deductibility and operating cash costs are different questions, and this calculator makes no tax calculation. Neither the one percent rule nor the fifty percent rule comes from a government rate table.

Move from a screen to a property budget

Use the comparisons to identify what needs more investigation, then obtain current bills, reliable rent evidence and information about the property's condition. The related break-even rent tool covers the mortgage and operating costs you enter. The DSCR tool measures a different relationship between rent and loan-related costs.

Ask a property professional about local demand and maintenance needs, and an accountant about tax treatment. No price growth, capital expenditure, leverage benefit or resale return is forecast here.

Common questions