Due date from terms (Net 30/45/60). The Invoice Due Date Calculator takes invoice date, payment terms and returns due date plus days from today until due (negative = overdue). Results update as you type, and the formula is shown under the result so you can repeat it in your own spreadsheet.
Financial ratios are only useful in comparison: against last year, against a competitor, or against the benchmark for your industry. Take the figures from the same set of accounts, note whether they are yearly or monthly, and read each ratio alongside the others in its family. Use the worked example below to check the maths against your own figures.
How the Invoice Due Date Calculator works
Net terms count calendar days from the invoice date, so Net 30 on 5 September falls due on 5 October. The second figure compares that date with today so you can see how many days remain or how overdue an invoice is.
Worked example
With the example values (invoice date 2026-09-05, payment terms "Net 30"), the due date is 2026-10-05; days from today until due (negative = overdue) 30 days. Change any figure above and the result updates immediately; use Copy results to paste the summary into a note or email.
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Frequently Asked Questions
How is due date calculated?
due date = invoice date + payment terms in days.
Which figures do I need?
Invoice date, payment terms. Take them from the same period and the same set of accounts or reports so the ratio is consistent, and check the example values as a guide to the units expected.
What is a good value for this ratio?
Benchmarks differ by industry, size and business model, so compare with companies like yours and with your own history. A ratio moving in the wrong direction for several periods matters more than any single number.
