Why this site exists
Payment terms are inconsistent by nature: Net 30, Net 45, EOM, EOM + 15 — every client seems to mean something slightly different, and spreadsheet formulas for them get copied around until nobody remembers how they work. DueDate Calc gives one straight answer: enter an invoice date and terms, get the exact due date.
What you can do here
- Single invoice calculator — Net 7–90, EOM, EOM + 15, or custom day counts, in calendar days or business days (optionally skipping US federal holidays).
- List calculator for spreadsheet users — paste a whole invoice register (or open a CSV), get every due date at once, and copy or export the results back out.
Our data promise
Every calculation runs locally in your browser. Nothing you enter — dates, terms, or lists — is uploaded, stored, or shared. There are no accounts and no tracking. Read the details in our Privacy Policy.
Disclaimer
DueDate Calc provides date calculations for general informational purposes only. Results do not constitute financial, legal, or accounting advice. The binding due date for any invoice is whatever you agreed with your customer or supplier — always check the actual contract when money is on the line.
Contact
The site is operated by the DueDate Calc team. Reach us at xtwh888@gmail.com — bug reports, term definitions you'd like added, and correction suggestions are all welcome.