Here are several calculators to help you with your investment decisions.
Gross Rent Multiplier
GRM is a rule of thumb normally used in the apartment (multi-family) side of the business. It is simply the number of years of gross rent required to recapture the purchase price.
The Capitalization Rate or Cap Rate is a ratio used to estimate the value of income producing properties. Put simply, the cap rate is the net operating income divided by the sales price or value of a property expressed as a percentage. Investors, lenders and appraisers use the cap rate to estimate the purchase price for different types of income producing properties.