Invoice Due Date Calculator for Excel Users

Paste your invoice list — one per line, date, terms — and get every due date at once. No formulas, no drag-fill mistakes. Your data never leaves the browser.

Your invoice list (one per line: 2026-01-15, Net 30)

Upload CSV

Day counting mode (applies to the whole list) Calendar days Business days (skip weekends)

Paste a list above (or fill the sample) to see every due date.

Why this beats a due-date column

Net terms, EOM and EOM + 15 handled in one place — no nested IF/EOMONTH formulas.
Optional business-day counting that skips weekends and US federal holidays — hard to get right in a sheet.
Paste straight from your invoice register; copy or export the results straight back.
Runs entirely in your browser. No uploads, no accounts, nothing stored.

Only need one due date? Use the single invoice calculator.