13 free calculators for rental deals, mortgages and landlord math. Every result comes with the formula and your numbers in it, so you can check it and take it to your lender. No signup, no paywall.
Same $425,000 duplex, every angle
Each calculator opens with the same example already filled in, so the answers below are live results, not sample copy. Change the numbers on any page and every formula updates.
All run on the same $425,000 duplex.
The same $425,000 price, from the buyer’s side.
The math landlords do every month.
Price, rent, loan and costs in, and cash flow, NOI, cap rate, DSCR, cash-on-cash and GRM out, each with its formula. It starts on a real example. Replace it with yours.
Cash flow after the mortgage
−$77a month
This duplex loses $77 a month at 20% down. A DSCR of 0.97 is short of the 1.25 most lenders ask for.
This duplex loses $77 a month at 20% down. A DSCR of 0.97 is short of the 1.25 most lenders ask for.
Every row links to its own calculator, with the formula explained on this same duplex.