Late Fee Calculator
Calculate late fees in seconds. Enter your invoice amount, rate, and days overdue. Get the exact fee breakdown. Copy-paste into your email.
Calculate Late Fees →Why Use It?
Instant
Enter 3 numbers. Get the result in 1 second. No loading. No waiting.
Copy-Paste Ready
The result is formatted for your email. Copy, paste, send. Done.
Mobile Friendly
Calculate late fees on your phone while you're at a client meeting.
No Signup
Open the page, use it, close it. We don't want your data.
No Watermarks
Your email is yours. No "Generated by FreeTool™" anywhere.
Accurate
Uses the standard simple interest formula. Legally sound.
How It Works
Enter Invoice Amount
How much was the original invoice?
Enter Rate
What's your late fee rate? (e.g., 1.5% per month)
Enter Days Overdue
How many days late is the payment?
Get Result
Instant fee calculation + new total. Copy-paste ready.
Stop Guessing. Calculate Exactly.
Professional freelancers don't guess late fees. They calculate them precisely. Use our free calculator and get paid what you're owed.
Calculate Now →