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Gross Rent Multiplier (GRM) Calculator

Calculate annual gross rent multiplier from purchase price and scheduled rent, then estimate implied price and required rent at your editable target.

What this baseline models

  • US/USD acquisition screen
  • Annual scheduled rental income only
  • Editable target and direct inverses
  • No investment scoring or payback claim

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Compare purchase price with gross rent

gross-rent-multiplier@1.0.0

Inputs and assumptions

Use purchase price and annual scheduled property rent before vacancy, collection losses, operating expenses, financing and taxes. Exclude non-rental income. The target is your assumption, not a market benchmark or recommendation; 10.00× is only an editable example.

Purchase price and scheduled rent
USD
USD / year · rental income only
Editable assumption
× · unitless ratio

Actual annual GRM

10.00×

Purchase price divided by annual scheduled rent

Implied purchase price at target

$300,000.00

Arithmetic only, not market value or a valuation opinion

Required annual rent at target

$30,000.00

Purchase price divided by the entered target

Required monthly rent equivalent

$2,500.00

Calculated directly before rounding to cents

Rent and target context

Annual scheduled rental income and its monthly equivalent use one input.

Entered annual rent
$30,000.00
Entered rent monthly equivalent
$2,500.00
Target annual GRM
10.00×

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Assumption checks

Deterministic checks based only on this scenario's inputs and outputs.

Annual rent sensitivity

Annual rent changes by −10%, −5%, 0%, +5% and +10%, rounded to supported cents. Price and target stay fixed. Each row reruns the same engine; duplicate rent amounts remain labeled and unsupported boundary rows are omitted.

Annual rent sensitivity details
Gross Rent Multiplier annual rent sensitivity calculation results
Rent changeAnnual rentActual GRMImplied price at target
-10.00%$27,000.0011.11×$270,000.00
-5.00%$28,500.0010.53×$285,000.00
Base$30,000.0010.00×$300,000.00
+5.00%$31,500.009.52×$315,000.00
+10.00%$33,000.009.09×$330,000.00

Formula reference

Every output is explainable

Money is displayed in USD and rates are entered as percentages where applicable. Formula version gross-rent-multiplier@1.0.0 stays attached to the result.

Actual annual GRM

Purchase price ÷ Gross scheduled annual rent

Annual scheduled rental income only, before vacancy, expenses, financing and taxes. Zero rent makes this ratio unavailable.

Implied purchase price at target

Gross scheduled annual rent × Target annual GRM

Arithmetic at a user-selected ratio, not an appraisal or valuation opinion. Zero rent gives $0 without implying zero market value.

Required annual rent at target

Purchase price ÷ Target annual GRM

The annual scheduled rent that matches the entered price and positive target, calculated from unrounded inputs.

Required monthly rent equivalent

Purchase price ÷ Target annual GRM ÷ 12

Calculated directly before rounding to cents, rather than dividing the rounded annual result.

Entered rent monthly equivalent

Gross scheduled annual rent ÷ 12

A display equivalent of the single annual rent input; it is not a separately editable assumption.

Example scenario

A 10.00× actual GRM with a 9.00× target

A $300,000 purchase and $30,000 annual scheduled rent produce 10.00× actual GRM. At a separate example target of 9.00×, implied price is $270,000 and required annual rent is $33,333.33. The editable form starts at 10.00×.

Open the example in the calculator

Purchase price

$300,000.00

Annual rent

$30,000.00

Implied price at 9.00×

$270,000.00

Required monthly rent at 9.00×

$2,777.78

FAQ

Common questions

Does GRM use annual or monthly rent?

This calculator explicitly uses annual scheduled property rent. Appraisal conventions also use other periods and income definitions. Convert periods consistently before comparing ratios; a monthly-rent multiplier is 12 times the annual-rent multiplier for the same price and rent.

Is the target a recommended GRM?

No. It is your editable assumption. The 10.00× default is only an example, not a market benchmark, investment rating or valuation opinion.

What happens with zero rent?

Actual GRM is unavailable because division by zero is undefined. Implied price is mathematically $0 at the entered positive target, without asserting that market value is zero. Required rent remains calculable.

How is GRM different from cap rate?

GRM divides price by gross rent. Cap rate divides NOI by property value. Gross rent ignores vacancy, expenses and debt service; GRM is not cap rate, cash-on-cash return, net yield or an actual payback period.

Read the supporting methodology, then compare this result with another view of income, financing, or project returns. Each calculator uses its own transparent assumptions.