Four calculators built for the moment you are standing in a driveway with a listing sheet, trying to decide whether the numbers hold up before you call the agent back.
RentalPropertyCalc runs four small tools: a full rental property calculator, a cap rate calculator, a cash-on-cash return calculator and a 1% rule screen. Each one takes a handful of inputs and returns a number in the same tab, with no login and no spreadsheet to build first.
A lot of rental property tools assume you have an afternoon to model twenty years of cash flow. Most landlords do not have that kind of time when they are standing in front of a property or scrolling a new listing on their phone. This site is built around the questions that come up in that first five minutes: does the rent clear the 1% mark, what does the cap rate look like at this price, and what would cash-on-cash return actually be with a normal down payment. The deeper analysis still matters. It just comes second.
Next to the calculators sits the 2026 metrics reference, a dataset page that shows how cap rate, cash-on-cash return and the two screening rules move together across a range of rent-to-price ratios on the same hypothetical property, with a CSV download for anyone who wants to pull the numbers into their own spreadsheet.
Jessica Martinez writes and keeps current the guide articles that sit alongside the calculators. Chris Terry owns RentalPropertyCalc, along with a small group of other independent calculator sites, and is the one who checks a formula when something looks off. The editorial standards page covers how that checking actually works.