Interest rates are compensation for the time-value of money, and are calculated on judgments (the amount of money one party to a lawsuit is ordered to pay another party) based on the applicable state or federal statutes. There are often different interest rates set by law for prejudgment interest (the interest on the amount owed before the judgment) and post-judgment interest (the interest on the amount owed after the judgment). The calculation of prejudgment and post-judgment interest rates vary from state to state (and in federal court), and require a careful analysis of the statutes.

In Wyoming, interest rates on judgments are governed by state statutes. Prejudgment interest refers to the interest that accrues from the time the money is owed until a judgment is entered, and is intended to compensate the plaintiff for the loss of use of the money during that period. Post-judgment interest accrues from the time the judgment is entered until the judgment is paid. The rates for both prejudgment and post-judgment interest can vary and are set by Wyoming statutes. As of the knowledge cutoff in 2023, Wyoming Statute § 1-16-102 establishes the legal rate of interest at 7% per annum when no other rate is agreed upon. For prejudgment interest, the rate may be set by the court and can be based on the rate specified in a contract if one exists. Post-judgment interest rates are typically set at the statutory rate from the time of the judgment until the judgment is satisfied. It is important to consult the current statutes or an attorney to determine the applicable interest rates for a specific case, as these rates can be subject to legislative changes.