Post-Judgment Interest Calculator — Statutory Interest on Court Awards
Enter the court-awarded amount, the applicable statutory interest rate, and the number of days since judgment was entered to find the total accrued interest and the current balance owed. Supports both simple and compound interest methods.
%
days
Interest calculation method
Original judgment plus all accrued post-judgment interest
- 1
Time elapsed
365 ÷ 365 = 1 years - 2
Accrued interest
10,000 × 9% ÷ 100 × 1 = 900 - 3
Total amount owed
10,000 + 900 = 10,900
How does this calculator work?
Post-judgment interest = Principal × Rate × (Days ÷ 365) for simple interest (standard in most jurisdictions). Enter the judgment amount, the statutory annual rate for your jurisdiction (e.g. 9% NY, 10% CA, 8% UK, ~5% US federal 2024), and days elapsed to find accrued interest and the current balance. Always confirm the applicable rate and method with a legal professional.
Formula
How this is calculated
Post-judgment interest accrues automatically on an unpaid court judgment from the day it is entered until it is fully satisfied. Its purpose is to compensate the winning party (judgment creditor) for the time-value of money and to discourage the losing party (judgment debtor) from delaying payment indefinitely.
In most common-law jurisdictions (United States, United Kingdom, Australia, Canada) interest is calculated as simple interest on the original judgment principal: Interest = Principal × Rate × (Days ÷ 365). Some statutes use a 360-day banker year rather than 365 days — verify with your jurisdiction. Key statutory rates as of 2024 include: New York State 9% per annum, California 10%, United Kingdom 8%, and the United States federal post-judgment rate (28 U.S.C. § 1961) set weekly based on the 52-week Treasury bill yield (approximately 5.0–5.3% in mid-2024). Many EU and other civil-law countries apply the central bank reference rate plus a statutory margin.
The compound-interest option is provided for jurisdictions or contractual arrangements that do specify compounding. The daily interest figure helps lawyers and creditors compute settlement amounts for an exact payment date. Because rates and rules differ widely, always verify the applicable statute or contract with a qualified legal professional before relying on this tool.
Frequently asked questions
No, in most US jurisdictions (state and federal) post-judgment interest is simple interest calculated on the original judgment amount only, not on accumulated interest. The formula is: interest = principal × rate × (days ÷ 365). Compound interest would only apply if a contract or a specific statute explicitly provides for it.
Typically from the date the court formally enters the judgment, not from the date of the underlying event, contract breach, or trial. Enter the number of days between the judgment date and the intended payment or settlement date to get the accrued interest for that period.
The federal post-judgment rate (28 U.S.C. § 1961) changes weekly and equals the 52-week T-bill yield rounded to two decimals. The Federal Reserve publishes it in the H.15 statistical release. As of mid-2024 it is approximately 5.0–5.3%. Look up the current rate and enter it in the rate field above.
Also known as
TG we-Calculate Editorial Team. (2026). Post-Judgment Interest Calculator — Statutory Interest on Court Awards [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/post-judgment-interest-calculator
TG we-Calculate Editorial Team. "Post-Judgment Interest Calculator — Statutory Interest on Court Awards." TG we-Calculate. 2026. https://we-calculate.com/calculator/post-judgment-interest-calculator.
TG we-Calculate Editorial Team, "Post-Judgment Interest Calculator — Statutory Interest on Court Awards," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/post-judgment-interest-calculator
@misc{wecalculate_post_judgment_interest_calculator, title = {Post-Judgment Interest Calculator — Statutory Interest on Court Awards}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/post-judgment-interest-calculator}}, year = {2026}, note = {TG we-Calculate} }
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