THE NUMBERS, EXPLAINED
How to use this calculator.
Discount and delivery are allocated in proportion to quantities. Charges are mathematical shares before currency rounding; they sum to the order total.
Start with your inputs
Enter participant quantities, unit price, order-wide discount (%), delivery fee. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Participant quantities | 2,3,5 |
| Unit price | 10 |
| Order-wide discount (%) | 10 |
| Delivery fee | 10 |
A worked example
With the example inputs above, participant charges is 20, 30, 50. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Participant charges | 20, 30, 50 |
| Total order charge | 100 |
How this is calculated
Participant charges
Allocate discounted goods and delivery proportionally by participant quantity.
Total order charge
Apply goods discount then add delivery.
Symbols and units
- a
- Participant quantities
- b
- Unit price
- c
- Order-wide discount (%)
- d
- Delivery fee
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
Discount and delivery are allocated in proportion to quantities. Charges are mathematical shares before currency rounding; they sum to the order total.
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?
Participant charges; Total order charge. 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: Discount and delivery are allocated in proportion to quantities. Charges are mathematical shares before currency rounding; they sum to the order total.
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 →