Post Judgment Interest Calculator

This post judgment interest calculator takes the figures you already have and applies the relationship behind post judgment interest calculations for you, giving accumulated interest and time passed from date of judgment, date of writ, interest rate and judgment amount.

What Is the Post Judgment Interest Calculator?

The post judgment interest calculator takes date of judgment, date of writ, interest rate and judgment amount and turns them into accumulated interest and time passed.

It is the kind of calculation you would otherwise do on the back of an envelope: mechanical, repeatable and easy to get subtly wrong without noticing.

How the Post Judgment Interest Figure Is Built

Each result is calculated from the ones before it, so the working is fully visible. That matters when the answer is going to be quoted to somebody else and you need to be able to explain where it came from.

The figures are exactly as good as the assumptions underneath them. Check the rates, the periods and the tax treatment before you rely on the result.

Reading the Result Sensibly

A small change in an input can move the result by much more than you would expect, particularly where the calculation divides by one of the figures you supplied. That is worth understanding before you rely on a figure.

For anything that will be committed to, write the inputs down beside the result. A number you can reproduce is worth far more than one you cannot explain.

A Worked Example

Working through an example, with date of judgment set to 10, date of writ set to 5, interest rate set to 2, the calculator returns accumulated interest of -2.74, and time passed of -5. Substitute your own figures and the same steps produce the same kind of answer.

Frequently Asked Questions

What do I need to work out accumulated interest?

Enter date of judgment, date of writ, interest rate and judgment amount. The calculator then works through the relationship and reports accumulated interest and time passed.

What does the post judgment interest actually calculate?

It takes date of judgment, date of writ, interest rate and judgment amount and converts them into accumulated interest and time passed using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.

How should I enter date of judgment?

Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.

Do I have to fill in every field?

Only the fields a particular result depends on. If you leave one blank, the results that need it simply show a note instead of a number, and everything else still works.

Does anything you type get stored?

No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.

Scroll to Top