← Blogby Marcell Almeida

How to calculate invoice due dates from payment terms

Pick issue date and terms — get the exact due date for Net 30, Net 60, or custom.

"Net 30" means payment is due 30 days after the invoice date — but weekends matter when you chase AR. The Invoice Due Date Calculator adds payment terms to any issue date.

Try it — issue date and payment terms

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How it works

  1. Invoice date — when the invoice was issued.
  2. Payment terms — Net 30, Net 60, or custom day count.
  3. Due date — exact calendar date payment is due.

Net terms explained

Net 30 = invoice date + 30 calendar days. Some contracts use business days only — confirm your contract language.

Cash flow

Pair with the Break-Even Calculator when modeling how payment delays affect runway.

The How to calculate invoice due dates from payment terms is free, runs locally, and never sends your data to a server. More business calculators at maratool.com.