Financial calculator
Financial Calculator (Time Value of Money)
Solve for any of the five TVM variables: N, I/YR, PV, PMT, or FV. Then expand a full amortization schedule. The same engine math behind every loan in NoteHarbor.
Cash-flow signs: money you receive is positive, money you pay out is negative. A loan you take is PV positive with a negative PMT.
PMT: Per-period payment (paid out = negative)
-$1,199.10
- Payment
- $1,199.10
- Total interest
- $231,677.04
- Total paid
- $431,677.04
- Payments
- 360
How the financial calculator works
Almost every money question, whether it's a loan payment, a savings goal, or the yield on an investment, comes down to five numbers tied together by one relationship. Those five are the number of payments (N), the annual interest rate (I/YR), the value today (PV), the payment each period (PMT), and the value at the end (FV). Give this calculator any four of them and it solves the fifth. It behaves like a classic 10bII-style financial calculator, without the tiny buttons.
A worked example
Suppose you're carrying financing on a $200,000 property sale at 6% annual interest for 30 years, and you want to know the monthly payment. Set N to 360 (30 years × 12 months), I/YR to 6, PV to 200,000, and FV to 0, then press Solve next to PMT. The answer is about −$1,199 a month. It's negative because it's cash leaving the borrower's hands. Flip it around: enter the payment and solve for I/YR to find the rate a stream of payments really earns, or solve for N to see how many payments it takes to reach a target balance.
Turn a solve into a schedule
When you solve a standard, fully-amortizing monthly loan (a positive present value, a payoff to zero), the calculator can expand the whole amortization schedule underneath the result: every payment split into principal and interest with the running balance. That schedule is generated by NoteHarbor's servicing engine, so it's consistent to the cent with a loan you'd actually service.
Who it's for
Private lenders sizing up a new note, sellers offering owner financing, real estate investors comparing deals, and anyone who wants a quick, trustworthy answer to a payment, rate, or payoff question. It's a planning tool, a fast way to pressure-test the numbers before you commit.
Frequently asked questions
What is the time value of money?
It's the principle that a dollar in hand today is worth more than a dollar you'll receive later, because today's dollar can earn interest in the meantime. Every loan, savings plan, and note purchase is really a stream of dollars arriving at different times, and the time value of money is how you compare them fairly.
What do N, I/YR, PV, PMT, and FV mean?
N is the number of payments, I/YR is the nominal annual interest rate, PV is the value today (a loan amount or a purchase price), PMT is the payment made each period, and FV is the balance left at the end. Enter any four and the calculator solves the fifth.
Why does my payment show up as a negative number?
The calculator uses the standard cash-flow sign convention that every financial calculator follows: money you receive is positive and money you pay out is negative. If you borrow money now (PV positive), the payments you send back are negative. The sign just tracks the direction of the cash.
What's the difference between End and Begin mode?
End mode (an ordinary annuity) assumes each payment happens at the end of the period. That's the usual setup for a mortgage. Begin mode (an annuity due) assumes the payment happens at the start of the period, which is common for leases. Paying earlier slightly reduces the payment needed.
Does this match a real loan in NoteHarbor?
Yes. The amortization schedule is produced by the same servicing engine that powers NoteHarbor, working in exact integer cents, so the numbers are penny-for-penny what you'd see on an actual serviced loan.
Is anything I enter saved?
No. The entire calculation runs in your browser. Nothing is stored, logged, or sent to a server, and there's no login.
Run the numbers here. Service the loan in NoteHarbor.
This calculator is scratch math. NoteHarbor keeps the whole note alive, including amortization, payments, escrow, late fees, statements, and tax forms, for every loan you hold or broker, with the exact same engine behind these numbers.
Take the NoteHarbor Financial Calculator with you
The free companion app is out now on the App Store. Same engine, same answers, in your pocket. It runs free on the web below too.
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These calculators are provided for educational and planning purposes only. They are estimates, not financial, tax, or legal advice, and not an offer to buy or sell anything. Figures assume on-time payments and the inputs you enter; your actual loan or transaction may differ.