Enter your invoice date and payment terms (Net 15, Net 30, Net 60, and more) to see exactly when payment is due, and how many days away that is. Free, and no signup needed.
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It is a free tool that works out exactly when an invoice is due from the invoice date and the payment terms. Instead of counting days on a calendar, you pick the terms (Net 30, Net 60, due on receipt, end of month, or a custom number of days) and see the precise due date and how many days away it is. It helps you set clear expectations on every invoice and follow up at the right time.
Net 30 means payment is due 30 days after the invoice date. The "net" refers to the full invoice amount, and the number is the number of days the client has to pay. So an invoice dated the 1st with Net 30 terms is due on the 31st. The same logic applies to Net 15, Net 45, Net 60, and Net 90: just count that many days from the invoice date. This calculator does the counting for you, including months of different lengths.
| Term | When payment is due |
|---|---|
| Due on receipt | Immediately, on the invoice date |
| Net 15 | 15 days after the invoice date |
| Net 30 | 30 days after the invoice date |
| Net 60 | 60 days after the invoice date |
| Net 90 | 90 days after the invoice date |
| EOM (end of month) | The last day of the invoice month |
Worth knowing before you pick your terms:
From our invoice data: Shorter terms bring the money in sooner: invoices due on receipt are paid in 15.9 days on average and Net 30 invoices in 47.2 days, while the share paid by the due date barely changes (39.1% against 42.3%).
Source: Billbooks invoice payment study, 53,095 paid invoices from 180 businesses, 2007 to August 2026. See the invoice payment study
Enter the invoice date (it defaults to today), pick your payment terms, and the due date and countdown update instantly. For unusual terms, choose "Custom number of days" and type the number. Use "End of the invoice month" or "End of next month" for EOM-style terms that many suppliers use.
State the terms and the exact due date clearly on every invoice so there is no confusion. Shorter terms get you paid faster, so use Net 15 or due on receipt where you can, and save Net 60 or Net 90 for larger clients who require it. Consider an early-payment discount to speed things up, and set a late fee for overdue invoices. When a payment slips past its due date, our free late fee calculator works out the fee and total owed. For a deeper look at Net 30, EOM, and choosing the right terms, see our guide on invoice payment terms.
This calculator counts calendar days, not business days. If your terms are based on business days, adjust for weekends and holidays.
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Set the due date here, then handle the rest with our free, no-signup tools:
Date already gone by? The late fee calculator works out what you are owed on top. Setting the terms in the first place? The free invoice generator puts them on the invoice.
Payment terms work differently by trade:
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