Don't know the monthly payment? Enter the UPB, interest rate, and remaining term to calculate it instantly.
Fill in the loan details above and click Calculate to see your monthly payment.
When you're analyzing a note and the seller doesn't know (or won't tell you) the monthly payment, you can calculate it yourself from three numbers: the remaining balance, the interest rate, and how many months are left.
UPB stands for Unpaid Principal Balance — what the borrower still owes today. This is not the original loan amount; it's the current remaining balance after years of payments. Always get a current payoff statement to verify the real UPB before buying.
The monthly payment is the foundation of every other note calculation. Your yield, your offer price, your cash flow — all of it starts with knowing exactly what the borrower pays each month. If a seller gives you a payment that doesn't match the UPB, rate, and term, that's a red flag worth investigating.
This is the rate stated in the original note documents — the rate the borrower agreed to pay when the loan originated. It doesn't change over the life of a fixed-rate note, regardless of what current market rates are doing. If you're evaluating an adjustable-rate note, you'll need to account for any scheduled rate changes separately; this calculator assumes a fixed rate for the remaining term.
Once you have a verified monthly payment, it becomes an input everywhere else on this site — the Yield Calculator, the Offer Price Calculator, and the Comparison Tool all start from this number. Getting the payment right at this step keeps every downstream calculation accurate.
I use this calculator as a cross-check almost as much as I use it to fill in a missing number. If a seller tells me a note pays $724 a month and I run the UPB, rate, and term through this tool and get something noticeably different, that's a conversation I have before I go any further — not after I've wired money.
In my years around real estate deals, the numbers that don't quite add up are usually the ones worth slowing down on. Sometimes it's an innocent mistake. Sometimes it means the note was modified and nobody mentioned it. Either way, I want to know before I buy, not after.