What the app does
Judgment Interest Calculator computes statutory and contractual interest on a money judgment or claim. Enter a rate, a principal, and your dates, and it returns the accrued interest, the per-diem, and the running total. Turn on a state pack and the app fills in that state's statutory rates for you; for post-judgment interest it also tracks rate changes over time — splitting the timeline at each statutory reset — and handles partial payments two different ways.
The app works entirely offline. There is no account to create, and no data ever leaves your device.
Pre-Judgment tab
- Pick your jurisdiction. Leave it on General to type any annual rate yourself, or choose Nevada to auto-fill the statutory rate under NRS 17.130, 99.040, or 108.237.
- Enter the principal — the amount interest runs on.
- Set the time period. Choose a start date; the end date defaults to today, and a Today button and plain-English duration make the range easy to set.
- Read the result. You get the interest, the daily per-diem, and the total of principal plus interest.
Post-Judgment tab
- Enter the judgment amount and the date it was entered. The "through" date defaults to today.
- Choose the rate. In General mode you enter one rate. With the Nevada pack on, the app applies the statutory post-judgment rate and automatically adjusts it at each January 1 and July 1 change, so a multi-year judgment is calculated correctly across every rate period.
- Add partial payments (optional). Tap to add a payment with its date and amount. Choose principal-first or the U.S. Rule (interest-first) and the app keeps a running balance.
- Review the schedule. The app shows each period, its rate, the interest accrued, any payment applied, and the remaining balance.
Frequently asked questions
Which states are supported?
Every state — in General mode you enter the rate that applies to your matter. The Nevada pack is the first to auto-fill statutory rates and track post-judgment rate changes for you. Additional state packs are planned.
Where do the Nevada rates come from?
The Nevada pack uses the prime rate set by the Nevada Commissioner of Financial Institutions (which resets each January 1 and July 1) plus the statutory margin for the selected statute. You should always verify the current rate against the official source for your matter.
What's the difference between "principal-first" and the "U.S. Rule"?
They are two ways to apply a partial payment. Principal-first reduces the outstanding principal before interest; the U.S. Rule applies the payment to accrued interest first and then to principal. Courts and jurisdictions differ, so the app lets you choose.
Does the app store or send my data?
No. It has no account, no analytics, and no network connection. Everything you enter stays on your device. See the Privacy Policy.
Is this legal advice?
No. Using this app does not create an attorney-client relationship in any way and does not constitute legal advice. Consult the applicable state and local laws regarding pre- and post-judgment interest rates, and verify all figures independently.