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Investor Tool · The Realtorian

Cap Rate Calculator

Run the numbers on a rental before you make an offer

Enter the price, rent, and expenses to see the net operating income and cap rate. Don't know what the place will rent for? Request a property-specific rent estimate below and it'll land in your inbox.

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Property Numbers
Results update as you type
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Not sure? Get a rent estimate ↓
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Pet rent, storage, laundry, lot rent

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5% is about 18 days empty per year. Use more for turnover-heavy rentals.

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South Carolina tax tip: Rentals are assessed at 6% of value instead of the 4% owner-occupied rate, and they don't get the owner-occupant break on school operating taxes. The seller's current tax bill is often far lower than what you'll pay, so check the county's numbers for a non-owner-occupied property.
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Self-managing? Leave management in anyway. Your time isn't free, and a buyer or lender will count it.

Cap Rate
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Enter a price and rent to see the cap rate
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Your breakdown will appear here
Cap rate is net operating income divided by the price. Mortgage payments aren't part of it.
Looking at a deal?
Get a second set of eyes on the numbers
David works with investors across the Upstate on rentals, land, and 1031 exchanges, and he'll tell you honestly if a deal doesn't pencil.
Contact David 1031 Exchange Guide
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Get a Rent Estimate for a Specific Property
Based on recent rental listings nearby, sent straight to your inbox

Tell us about the property and we'll email you an estimated monthly rent with a likely range. If you've filled in the calculator above, the email will also show your cap rate at that rent. Use a real email address, since the estimate is only sent by email.

Up to 2 estimates per person each month. David will see your request and may follow up. No spam, and your info is never sold.

What a cap rate tells you

A cap rate is the property's net operating income divided by its price. It shows the return you'd earn if you paid all cash, which makes it a fair way to compare one rental against another regardless of how each buyer finances it.

Cap Rate = Net Operating Income ÷ Price

A $250,000 rental with $17,500 of NOI is a 7% cap.

What goes into NOI

Start with the rent the property could collect, subtract vacancy, then subtract operating costs: taxes, insurance, management, repairs, a reserve for big-ticket items, and anything else the owner pays.

Mortgage payments, depreciation, and income taxes are not part of NOI. That's why a property can have a decent cap rate and still lose money each month with a big loan on it.

Where cap rates fall short

A cap rate is a snapshot of one year. It doesn't account for appreciation, rent growth, financing, or a roof that needs replacing in two years, and it's only useful when you compare similar properties in similar areas.

Be skeptical of a seller's "pro forma" cap rate. Rebuild it with real taxes, real insurance quotes, and a vacancy number you believe.

This calculator and any rent estimate are for informational purposes only. They are not an appraisal, a guarantee of rental income, or financial advice. Verify taxes, insurance, and rents before you buy.