Date calculators · Bills & renewals
Invoice Aging Calculator
Group outstanding invoices into current, 1–30, 31–60, 61–90 and 91+ day buckets. See overdue balances and individual invoice details on any report date.
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Select your counting rules and calculate.
Calculation details
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How to use this calculator
Choose a report date and one currency. Add each invoice's reference, due date and remaining balance as of that report date. Calculate, inspect the buckets and download the report as CSV.
The payment due date is still current; the following date is one day overdue. Balances use whole cents. Settled zero-balance invoices remain in the breakdown but do not increase the open-invoice count. This analyzes the balances you enter, without reconstructing payment history or adding interest.
A worked example
On November 1, 2026, a $250 invoice due October 1 is 31 days overdue. A $500 invoice due November 15 is current. The report totals $750, with $250 in the 31–60 day bucket.
How is invoice aging different from finding an invoice due date?
Invoice Due Date applies payment terms to one invoice. Aging classifies a list of existing balances on a chosen reporting date. Use the due-date tool first if you need to calculate the contractual date.
Further reading: Source workflow and conventions. Your entered rules determine this result.
Which calendar and years are supported?
Use Gregorian dates from 1900 through 2100, with results inside that range. Most daily plans are limited to 366 dates; academic terms and sprint plans allow up to 731. Forms limit the number of entries to keep calculations responsive. Holidays and policy rules come from your inputs. Date-only plans ignore DST; tools with time-zone inputs use the browser's time-zone data and explicitly resolve repeated times. Calendar exports preserve date-only markers or exact timed events as appropriate. Calculations run only when requested, without background polling.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.