THE NUMBERS, EXPLAINED
How to use this calculator.
Uses amounts already verified eligible and payable before expiry. Applies a single supplied maximum; no scheme-specific legal or tax interpretation.
Start with your inputs
Enter available voucher balance, eligible fees due before expiry, ineligible fees, supplied maximum voucher payment. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Available voucher balance | 200 |
| Eligible fees due before expiry | 180 |
| Ineligible fees | 40 |
| Supplied maximum voucher payment | 150 |
A worked example
With the example inputs above, voucher amount applied is 150. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Voucher amount applied | 150 |
| Fees payable in cash | 70 |
| Unused voucher balance | 50 |
How this is calculated
Voucher amount applied
Take the smallest of balance, eligible fees and supplied payment cap.
Fees payable in cash
Subtract applied credit from all fees.
Unused voucher balance
Subtract credit applied from available balance.
Symbols and units
- a
- Available voucher balance
- b
- Eligible fees due before expiry
- c
- Ineligible fees
- d
- Supplied maximum voucher payment
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
Uses amounts already verified eligible and payable before expiry. Applies a single supplied maximum; no scheme-specific legal or tax interpretation.
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?
Voucher amount applied; Fees payable in cash; Unused voucher balance. 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: Uses amounts already verified eligible and payable before expiry. Applies a single supplied maximum; no scheme-specific legal or tax interpretation.
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: Solve proportions and their applications ↗
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 →