Free calculator

Late Payment Interest Calculator

Free Late Payment Interest Calculator with instant browser-based results and a clear calculation breakdown.

Late Payment Interest Calculator

Calculate the interest charged on overdue payments. Enter the principal amount, annual interest rate, and number of days the payment is late to determine the total interest owed.
Please enter a valid amount greater than 0
Please enter a valid interest rate (0-100)
Please enter a valid number of days (0 or more)

Calculation Results

$0.00

Breakdown

Principal Amount: $0.00
Annual Interest Rate: 0%
Days Late: 0
Daily Interest Rate: 0%
Late Payment Interest: $0.00
Total Amount Due: $0.00
How It's Calculated: Interest = Principal × (Annual Rate / Days in Year) × Days Late

This calculator provides an estimate based on simple interest calculation. Actual late payment fees may vary depending on your contract terms, jurisdiction, and lender policies. Always refer to your specific agreement for exact terms.
Want to understand the calculation?
See examples, formula notes and limitations.
Read the guide