Start with the decision
A fixed processing fee often belongs to an order, not every item in it. If you use a per-unit calculator, allocate the order charge across the expected units. If you use an order calculator, enter the full order charge once.
Worked calculation
A 0.30 order fee across three identical candles is 0.10 per candle. Entering 0.30 on every candle would count 0.90 across that order. Conversely, dividing again in an order-level tool would undercount the fee.
Choose a consistent order allocation
For a target contribution margin, the available share of revenue is one minus the target share and percentage charges. Subtract fixed allocations from the revenue side before solving, and confirm that the remaining share is positive.
Choose the allocation denominator that matches the charge. For a fee per order, estimate units per order or allocate by each line’s share of order value; for a fee per listing, allocate by the listings that actually incur it. Write the convention beside the spreadsheet so a future price review does not silently switch methods.
Check the changed-cost scenario
Mixed baskets need extra care: dividing every order fee equally across products can distort a low-priced add-on, while allocating by revenue gives a different answer. Neither is universally correct for planning. Compare the method against a sample of real orders and never enter the full order fee on every unit.
| Input or result | Value |
|---|---|
| Fixed fee per order | 0.30 |
| Units in order | 3 |
| Allocation per identical unit | 0.10 |
| Incorrect full fee on each unit | 0.90 total |
For mixed baskets, equal allocation and revenue-weighted allocation produce different unit contributions. Record the chosen convention and apply it consistently. The full fee belongs once at order level; dividing and then dividing again understates it.
Use the example with your own inputs
Use a transparent allocation when orders contain mixed products. An allocation is an accounting assumption; compare it with actual order mix and keep the same convention across channels.
Wholesale Price & Margin Calculator | PourMarginScope and source checks
These are planning examples, not actual seller results. Keep currency, tax basis and cost allocation consistent. Enter your own figures and reconcile with your records; tax, demand, refunds and unlisted business costs can change the outcome.
See more pricing examples and assumptions.