Late Fee Calculator
Pick a penalty rule (flat, percent of due, per-day flat, or per-day percent), set grace days, and see the exact penalty and total payable, plus a 30/60/90-day unpaid forecast.
Inputs
Enter the unpaid amount, the dates, and pick a penalty rule.
Live result
Total payable
β
Enter a due date and a paid date to compute.
If unpaid forβ¦
| Days | Penalty | Total |
|---|---|---|
| 30 | $50.00 | $1,050.00 |
| 60 | $50.00 | $1,050.00 |
| 90 | $50.00 | $1,050.00 |
Forecast uses the same penalty rule, grace days, and amount due. For one-time penalty rules (flat, % of due), the result does not grow with time.
How it works
The calculator first computes days overdue as the gap between the due date and the paid date (or today). It then subtracts the grace period to get chargeable days. The penalty rule you pick decides the formula: flat and percent-of-due are one-time amounts (they do not grow with time), while per-day flat and per-day percent multiply by chargeable days.
The result panel shows the penalty, the total payable (amount due plus penalty), and a forecast of what the bill would look like at 30, 60, and 90 days unpaid. Use the forecast to decide on cap policies or to write a parent reminder that quantifies the cost of delay.
All calculations happen in your browser. Nothing is saved, sent, or logged. To automate the same math across thousands of fee invoices (with reminder SMS, parent portal display, and ledger posting), see the Fees Management module or browse other free planning tools on the tools hub.
Frequently asked questions
Automate fee penalties for every student
OpenEduCat's Fees Management module applies your late fee policy automatically across every invoice, sends reminders before and after the due date, and posts the penalty to the student ledger without manual data entry.