FREE TOOL · LOCAL CALCULATION
Calculate overdue invoice days and the estimated balance
Estimate days overdue, simple interest, and the updated balance. Then copy a reminder that asks for a concrete date without invented threats.
Updated August 1, 2026
ESTIMATED STATUS
Invoice overdueSuggested reminder
Hi [name], I am following up on invoice [number] for $1,500.00, due on Jul 2, 2026. It is now 30 days overdue. Could you confirm the expected payment date or let me know whether a detail is blocking processing?
Amounts and dates are calculated on this device. They are not sent or stored.
01 · FOLLOW UP WITH FACTS
Turn the calculation into a verifiable follow-up
1. Verify
Check the balance, currency, due date, and whether payment already arrived.
2. Calculate
Use only the rate, fee, and grace period written into the agreement.
3. Ask
Request a payment date or the administrative detail blocking processing.
4. Document
Record replies, promises, partial payments, and the final close.
FREE SAMPLE · 10 MESSAGES
Download payment reminders ready to adapt
Leave your email to receive ten collection messages. No payment or subscription will start.
FAQ
Frequently asked questions
Does the calculator decide what interest I can charge?
No. It only applies the values you enter. Review the contract and applicable rules before adding fees.
Does it use compound interest?
No. The estimate uses daily simple interest and adds an optional flat fee.
Does PDF Club save the amounts?
No. The calculation stays in the browser and the form sends only your email and topic interest.