Judgment Interest Calculator
This calculator works out post-judgment interest on a money judgment between the date it was entered and any date you choose. You give it the judgment, the statutory rate, whether that rate is simple or compounds annually or daily, and the day count basis, and it returns the interest accrued, the total owed, the daily rate and a period-by-period schedule. A second mode takes up to three partial payments and applies each one to accrued interest first and then to principal, which is the usual American rule and the reason a judgment with payments on it does not behave like an ordinary loan. The rate and the compounding are inputs rather than a built-in table because they are set by statute and differ by state and by federal court, and this page decides no legal question about which rule applies to you.