Tools / Investment scenarios
Mortgage & financing calculator
Calculate principal, interest and monthly property expenses, including zero-rate and all-cash cases.
Educational planning only. Examples are hypothetical; they are not market rates, quotes, coverage decisions or guaranteed returns. Inputs remain in this browser session and are not placed in URLs or analytics.
Enter your own figures, or load the labeled example. No financial inputs are sent to a server or stored in the URL.
Method and interpretation
For monthly rate r and n payments, payment = principal × r / (1 − (1+r)^−n). At zero interest, payment = principal / n. The rate is a nominal annual interest rate, not APR.
Calculations retain precision until display rounding. Blank required values block calculation. A negative cash flow or profit is a valid scenario, while an undefined return ratio is shown as not calculated.