legal interest rate calculator

Simple Interest Tool

Legal Interest Rate Calculator

Enter the amount, legal annual rate, and dates to estimate simple legal interest instantly.

The original judgment, invoice, settlement, or unpaid amount.
Type any custom rate required by your judgment, contract, statute, or court rule.
Optional manual day count
Use this only when you want to enter your own court-approved day count.

Interest Estimate

Estimated interest $0.00
Total amount due$0.00
Daily interest$0.00
Annual legal rate10.00%
Days counted0
Date range—
Input summary
Principal amount$10,000.00
Day count sourceDates
Calculation note

Interest is calculated using simple interest: principal × annual rate × days ÷ 365.

This calculator provides an estimate only. Legal interest rules can vary by jurisdiction, judgment type, contract terms, compounding rules, and court order. Confirm the correct rate and method before relying on the result.