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Updated 2026-04-20 · Real Estate · Educational use only ·
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Cap Rate vs GRM Calculator

Property metric comparison.

Compare Cap Rate and GRM for comprehensive property analysis. Enter property price and gross rent to see both cap rate and grm for property investment analysis.

What this tool does

Cap rate (NOI divided by price) and gross rent multiplier (price divided by annual gross rent) are two common property-screening metrics used to compare investments at a glance. Given property price, annual gross rent, and annual operating expenses, this calculator returns both the cap rate and GRM alongside the net operating income (NOI) that underpins the cap rate calculation. Cap rate output reflects the relationship between a property's operating profit and its purchase price, while GRM expresses price relative to rental income alone. The cap rate result is most sensitive to changes in operating expenses and purchase price, while GRM depends only on price and rental figures. Neither metric accounts for financing costs, vacancy rates, capital expenditure, or appreciation. Both outputs are for comparative illustration across properties and markets.

Quick answer: with the default values, the result is 16.67x / 3.50% (GRM / Cap Rate). Adjust the values below for your own figures.

Enter Values

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Formula Used
Price
Gross rent
Operating expenses

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Calculations or display — let us know.

Disclaimer

Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.

Cap Rate and GRM measure property value differently. GRM = price / annual gross rent (uses gross rent only). Cap Rate = NOI / property price (uses net operating income after expenses). GRM ignores expenses entirely; Cap Rate captures full operating economics. The two are often used together in deal analysis.

Example: 400k property, 24k annual gross rent, 10k operating expenses (taxes, insurance, maintenance, management). GRM = 16.67. NOI = 14k. Cap rate = 3.5%. The same property looks different through each lens. GRM might attract attention; Cap Rate reveals lower-than-market returns due to high expenses.

Why both metrics matter: GRM screens deals quickly (just need price and rent). Cap Rate gives true unleveraged yield once you have expense data. Properties with same GRM but different expense profiles have very different actual returns. 400k property with 30% expense ratio outperforms same-priced property with 50% expense ratio - despite identical GRM.

Run it with sensible defaults

Using property price of 400,000, annual gross rent of 24,000, annual operating expenses of 10,000, the calculation works out to 16.67x / 3.50%. The defaults are meant as a starting point, not a recommendation.

The levers in this calculation

The inputs — Property Price, Annual Gross Rent, and Annual Operating Expenses — do not pull with equal force. Two inputs usually tip the answer one way or the other. Flipping each value past a round threshold shows which input moves the result most.

How the math works

GRM = price / gross rent. Cap rate = NOI / price (NOI = gross rent - operating expenses).

Using this well

What this doesn't capture

This is a simplified model that holds its assumptions constant. Real outcomes vary with market conditions, costs, taxes, and timing, so the figure is best read as one scenario rather than a forecast.

Example Scenario

£400,000, £24,000 rent, £10,000 ops = 16.67x / 3.50%.

Inputs

Property Price:£400,000
Annual Gross Rent:£24,000
Annual Operating Expenses:£10,000
Expected Result16.67x / 3.50%
Expected Result breakdown
Gross Rent Multiplier16.67x
Cap Rate3.50%
NOI$14,000.00
Expense Ratio41.67%

This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.

Sources & Methodology

Methodology

This calculator computes two common real estate valuation metrics from property price, annual gross rent, and annual operating expenses. The Gross Rent Multiplier (GRM) divides the property price by annual gross rent, expressing how many years of rental income the purchase price represents. The Cap Rate divides net operating income (NOI) by property price, where NOI is calculated as annual gross rent minus annual operating expenses. Both metrics assume constant annual figures and do not account for property appreciation, vacancy rates, financing costs, capital expenditure, tax effects, or market cycle timing. The results are presented as ratios and percentages respectively, useful for comparing properties or assessing relative value, though they represent single-point snapshots rather than projections of future performance.

Frequently Asked Questions

Cap Rate vs GRM - which is better?
Cap Rate is more accurate (includes expenses) but requires expense data. GRM is faster (just price and rent) but ignores expenses. GRM is often used to screen many deals quickly, while Cap Rate suits more detailed analysis. Both are useful — they answer different questions.
Quick conversion?
Using a 40% operating expense ratio as a rough benchmark: Cap Rate is about (1 - 0.40) / GRM = 0.6 / GRM. So a GRM of 12 maps to roughly a 5% cap rate, and a GRM of 8 to about 7.5%. Where expenses run higher — for example in higher-tax jurisdictions — the ratio rises and the cap rate falls relative to what GRM alone implies.
Typical expense ratios?
Operating expense ratios are often cited in these ranges: single-family rentals around 35-45% of gross rent, multi-family around 40-50%, and commercial around 30-40%. Self-managing can lower the figure by roughly 10% (no management fee), while older properties may add 5-10% for extra maintenance. The '50% rule' — assuming expenses run near half of gross rent — is one rough rule of thumb sometimes used when actual expenses are unknown.
Cap Rate bands?
Cap rates are commonly grouped by asset quality and location, often along these lines: prime major-city core (Class A) around 3-5%, suburban (Class B) around 6-8%, smaller-city (Class C) around 8-10%, and rural (Class D) above 10%. A higher cap rate generally signals stronger cash flow but typically comes with higher risk and less appreciation; a lower cap rate often reflects an appreciation-focused property. Which band fits depends on the goals behind the investment.

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