The One Percent (1%) Rule.

Definition from Investopedia:

The 1% rule is a simple guideline that the monthly rents on a rental property, generally speaking, should be no less than 1% of the all in (purchase + renovation). It's a general guideline and properties that I highlight will likely be close to that.

Example:

If you have a property that you are all in at 125k and it generates $1400 per month, you'd be at 1.12%, which would be above 1%, so it's likely a decent investment.

Gross Rent Multiplier (GRM).

Definition from Investopedia:

This metric is simply the the all in (purchase + renovation) divided by the monthly rent.

For example, if you have a property that you are all in at 150k and it's monthly rents are $1500, the Gross Rent Multiplier is 100

This one gets a little more specific and lets you compare properties against each other on a more granular level than the 1% rule.

All In.

Your “all In” is the total amount you have in an investment property. Generally speaking this is the purchase price + repairs.