Example: an invoice dated January 15, 2026 with Net 30 terms is due Saturday, February 14, 2026.
Calendar days only — this does not account for public holidays.
This net 30 calculator works from the start date you enter. Enter an invoice date and choose a term. The calculator shows the due date, the first day the invoice counts as overdue, and how many days are left (or how many days overdue it is today). It counts calendar days, with the invoice date as day zero.
How to use the net 30 calculator
- Enter the invoice date. If your agreement starts the clock on another date, such as a delivery or acceptance date, enter that date instead.
- Choose a term. Net 30 is preselected. You can also pick net 15, 45, 60 or 90, or enter a custom number of days from 1 to 365.
- Read the results: due date, first overdue day, and days remaining or days overdue.
- If the due date falls on a Saturday or Sunday, the calculator adds a note naming the next business day.
Copy the dates into your invoice notes, calendar or tracker by hand. The calculator only does the date arithmetic.
How the net 30 due date calculator counts days
The calculator adds the term's number of calendar days to your start date. The start date is day zero, so day 1 is the next day. Weekends are counted like any other day. Public holidays are not built in, because they differ by country, region and year.
The invoice becomes overdue the day after the due date.
Net 30 calculator examples: month ends and leap years
| Invoice date | Net 30 due date |
|---|---|
| Sep 1, 2026 | Thu, Oct 1, 2026 |
| Sep 3, 2026 | Sat, Oct 3, 2026 |
| Sep 28, 2026 | Wed, Oct 28, 2026 |
| Jan 30, 2028 | Tue, Feb 29, 2028 |
| Jan 31, 2026 | Mon, Mar 2, 2026 |
The first row shows why "the same date next month" is not a reliable shortcut. September has 30 days, so 30 days after September 1 is October 1. A 31-day month works differently: 30 days after July 1 is July 31.
The 2028 row crosses a leap day, so the result is February 29. The last row starts on January 31, and 30 days later is March 2 because February 2026 has 28 days. The Sep 3 row lands on a Saturday. The due date does not move, but the calculator names the following weekday as a reference, not as a prediction of payment.
A worked example with fictional numbers
Alex, a freelance designer, issues invoice INV-104 to a client named Jordan on March 2, 2026 (Monday), for USD 1,200. The agreed terms are net 30 from the invoice date.
- Start date: March 2, 2026 (day zero)
- Due date: Wednesday, April 1, 2026
- First overdue day: Thursday, April 2, 2026
Suppose Alex plans follow-ups for April 4 and April 8. These are illustrative dates, not proven best dates. April 4, 2026 is a Saturday, so Alex might prepare that message for Monday, April 6 instead.
The calculator doesn't track balances. If Jordan says the invoice is paid, the balance stays USD 1,200 until Alex confirms the money arrived. If Alex verifies a USD 400 partial payment, USD 800 remains.
What the net 30 calculator does not decide
- The agreed start date. Net 30 is conventionally counted from the invoice date, but your contract or purchase order may say otherwise. Check the wording.
- Other wording. Terms such as "net 30 end of month" are counted differently, and this tool doesn't calculate them. Read what your agreement actually says.
- Holidays and client processing. If the due date is near a holiday your client observes, allow for it yourself.
- Whether the invoice was received or approved. A correct due date doesn't help if the invoice never reached the right person.
- Fees, interest or legal rights. Those depend on your agreement and where you work, and the calculator doesn't advise on them.
Use the net 30 calculator result for a follow-up
MoneyNudge shows which quotes and invoices need a follow-up today. It drafts each follow-up from your own template; you review it and send it from your own email. It never emails your clients on its own. It keeps a record of what you marked as sent, and when.For wording, see the invoice follow-up email templates for before and around the due date, and the overdue invoice email templates for after it. For the bigger picture, see invoice reminders, past due invoice steps, payment terms and what net 30 means.
Frequently asked questions
How do you calculate net 30?
Take the invoice date and add 30 calendar days to it; that date is when payment is due. The invoice date itself counts as day zero, not day one: January 1, 2026 plus 30 calendar days is January 31, 2026, not February 1. The calculator above does this addition for you, and also works for net 15, net 45, net 60, net 90 or any custom number of days from 1 to 365.
Is net 30 counted from the invoice date?
Conventionally yes, and that's what this calculator assumes: the invoice date is day zero, and the 30-day count runs from there. Some businesses instead count from the date goods or work were delivered, which can be a different day than the invoice itself. If your contract doesn't say which date applies, it's worth confirming with the client, since a few days' difference in the starting point changes the actual due date.
Does net 30 include weekends and holidays?
The net 30 calculator counts calendar days, including weekends. It does not adjust for public holidays, which differ by country, region and year. If a due date lands on a weekend, the displayed next-business-day note is information only. Your agreement and applicable rules determine whether payment is actually due on a different date.
What date is net 30 from today?
That depends entirely on today's actual date, so there isn't one fixed answer here that stays correct. Enter today's date into the calculator above with Net 30 selected, and it will show the exact due date, how many days remain, and whether that date falls on a weekend. Because the answer changes every day, using the calculator with your real current date is more reliable than a printed example.