THE NUMBERS, EXPLAINED
How to use this calculator.
Signed day offsets are supplied from contractual due dates; due today is current. Disputes, credit notes and interest are excluded.
Start with your inputs
Enter invoice face values (currency), receipts allocated to invoices (currency), days overdue at report date. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Invoice face values (currency) | 100,200,300,400 |
| Receipts allocated to invoices (currency) | 0,50,100,0 |
| Days overdue at report date | -5,15,45,100 |
A worked example
With the example inputs above, not yet due balance (currency) is 100. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Not yet due balance (currency) | 100 |
| 1–30 days overdue balance | 150 |
| 31–90 days overdue balance | 200 |
| Over 90 days overdue balance | 400 |
| Total outstanding (currency) | 850 |
How this is calculated
Not yet due balance (currency)
Include invoices due today or later.
1–30 days overdue balance
Sum unpaid balances in the first overdue band.
31–90 days overdue balance
Sum unpaid balances in the middle band.
Over 90 days overdue balance
Sum unpaid balances beyond ninety days.
Total outstanding (currency)
Add all invoice balances after allocated receipts.
Symbols and units
- a
- Invoice face values (currency)
- b
- Receipts allocated to invoices (currency)
- c
- Days overdue at report date
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Signed day offsets are supplied from contractual due dates; due today is current. Disputes, credit notes and interest are excluded.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Not yet due balance (currency); 1–30 days overdue balance; 31–90 days overdue balance; Over 90 days overdue balance; Total outstanding (currency). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Signed day offsets are supplied from contractual due dates; due today is current. Disputes, credit notes and interest are excluded.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax: Describe and Identify Cost Drivers ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →