About this tool
Gross Rent Multiplier Calculator is a free, in-browser tool that computes the GRM — a quick ratio for screening rental properties — and lets you solve for whichever variable you are missing. Pick the mode to find the GRM, the implied property value, or the rent, and it also reports the gross yield. All math is done locally; nothing is uploaded.
The core relationship is GRM = price ÷ (monthly rent × 12). Rearranged, implied value = GRM × annual rent, and implied rent = price ÷ GRM. Gross yield, the inverse view, is annual rent ÷ price × 100. A lower GRM (equivalently, a higher gross yield) means the property costs fewer years of gross rent to buy — generally more attractive, though it ignores expenses.
Use it to compare listings fast or to back into a price: in solve-value mode, enter a target GRM for your market and a rent to see what the property is worth; in solve-rent mode, enter a GRM and price to find the rent a deal needs. Because GRM uses gross rent, treat it as a first-pass filter and follow up with cap rate or cash flow for expenses.