Small Claims Interest Calculator
Calculate simple interest owed on a judgment or unpaid debt over time.
Assumptions used in this calculation
- Statutory rates vary by jurisdiction: Legal judgment interest rates are set by statute and vary widely by state/country and claim type, confirm your jurisdiction's actual rate before relying on this for a real claim.
About this calculator
Winning a small claims judgment or being owed on an unpaid debt doesn't mean the money stops accruing interest while it goes unpaid, most jurisdictions allow statutory interest to accumulate on the outstanding amount, and calculating that by hand across an odd number of days is easy to get wrong. This calculator applies simple interest, principal multiplied by the annual rate multiplied by the fraction of a year elapsed (days divided by 365), to show interest owed and the total amount now due. It's useful for anyone tracking what they're owed on a judgment, an informal loan, or an overdue invoice, and wanting a running total rather than reconstructing the math from scratch every time someone asks. Because actual statutory judgment interest rates are set by law and vary significantly by jurisdiction and claim type, this calculator computes simple interest at whatever rate you enter rather than assuming one, so confirm your local court's actual rate before relying on the result for a real claim.
Worked example
$5,000 at 10% for 180 days
Result: $246.58 interest
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