Calculator
Invoice due-date calculator
Find when an invoice is due, how many days remain or are overdue, and a sensible reminder schedule for your payment terms.
How the dates are worked out
The due date is the invoice date plus the number of days in your terms. “Net 30” means payment is due 30 calendar days after the invoice date. We count calendar days, including weekends, and handle month lengths and leap years for you. “Due on receipt” means the due date is the invoice date itself.
The reminder schedule is a starting point: a short heads-up before the due date, then follow-ups at 3, 7, 14 and 30 days after it. Adjust it to your contract and your client. Need the wording? Our late-invoice email templates cover every stage, and the automation guide shows how to send them without remembering.
Frequently asked questions
Does Net 30 mean 30 days from the invoice date or from receipt?
It usually means 30 days from the invoice date, unless your agreement says otherwise. If your client counts from the day they receive it, say so in your contract and invoice to avoid disputes.
What if the due date falls on a weekend?
The calculator keeps the true calendar date and flags weekends. Many payers process payments on the next business day, so expect a short lag.
Is my data stored?
No. Everything is calculated in your browser. Nothing you type is sent to a server or saved.