Gross rent and gross income multipliers

Price relative to gross income

A gross multiplier relates a property's sale price to its gross rental income. Derive a multiplier from comparable sales, then multiply the subject property's corresponding income by a supported multiplier to estimate value. Use comparable properties with similar income characteristics and expense burdens.

Keep the period and income basis consistent

For these calculations, the gross rent multiplier (GRM) uses monthly gross rent: sale price divided by monthly gross rent. The gross income multiplier (GIM) uses annual gross income: sale price divided by annual gross income. A multiplier is a factor, not a percentage.

Gross income is income before operating expenses. Potential gross income assumes full occupancy and collection; effective gross income adjusts for vacancy and collection losses and includes applicable other income. Match the income basis used for the comparable and the subject. Do not substitute net operating income into a gross multiplier formula.

Derive, apply, or solve backward

A comparable sells for $360,000 and rents for $3,000 per month. Its monthly GRM is $360,000 divided by $3,000, or 120. Applying 120 to a subject renting for $3,200 per month gives $3,200 times 120, or $384,000.

If the comparable's annual gross income consists solely of that rent, $3,000 times 12 equals $36,000. Its annual GIM is $360,000 divided by $36,000, or 10. The subject's annual rent is $3,200 times 12, or $38,400; $38,400 times 10 also gives $384,000. On the same income basis, the monthly multiplier is twelve times the annual multiplier.

To solve for income instead, divide value by the multiplier. A $384,000 value divided by a monthly GRM of 120 implies $3,200 monthly rent.

Two paths give the same value. A comparable sale of $360,000 divided by $3,000 monthly rent gives a monthly multiplier of 120. Subject monthly rent of $3,200 times 120 gives $384,000. The comparable's annual rent is $36,000, giving an annual multiplier of 10. Subject annual rent of $38,400 times 10 also gives $384,000. — Consistent monthly and annual calculations produce the same value.

Interpret the result

A higher multiplier means a higher price per dollar of gross income, not necessarily a better investment. Gross multipliers do not directly account for operating expenses, financing, or differences in net income. Their reliability depends on comparable properties and consistent income measurement. Direct capitalization instead divides net operating income by a capitalization rate; do not confuse that rate with a gross multiplier.