How this calculator works
Enter principal, annual interest (%), payment months. CalcStack applies the displayed formula and reports each intermediate planning value with the units shown.
Formula / method
Payment = Pr(1+r)^n ÷ ((1+r)^n−1)
Worked example
$300,000 at 6.5% over 360 months has payment about $1,896.20.
Assumptions and limitations
Interest compounds monthly and the rate stays constant for the full term.
Taxes, insurance, fees, prepayments and variable-rate adjustments are excluded.