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Calculation details
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How This Tool Works
Calculation Method
Computes Net proceeds from Item price, Shipping charged and Item cost.
Site methodology
No unrelated authority link is added merely to make this page look sourced. Tool-specific external sources are shown only when they directly support the method, rate, or rule.
Assumptions to Verify
- Marketplace and payment fees are user-entered estimates.
- Returns, taxes, advertising, and overhead may require separate allowances.
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Where a $58 sale goes
What this means for your numbers: In the worked example, the fixed $0.40 is 5% of the fee bill on a $58 sale; on a $20 sale it is 17%. Low-ticket items are where the per-order fee hurts; the percentage is what punishes heavy, shipping-included items.
Illustrative breakdown using the worked example above. The calculator computes your own numbers with the same formula.
Worked example: a $30 order, step by step
Take a $25.00 item, $5.00 charged for shipping, and $8.00 of item cost. Step 1: the fee base is both fields added, so 25.00 + 5.00 = 30.00. Step 2: 30.00 x 0.136 = 4.08, and since 30.00 is above 10.00 the fixed part is 0.40, giving 4.08 + 0.40 = 4.48. Step 3: net = 30.00 - 4.48 - 8.00 = 17.52, which is what the panel prints.
Shipping sits inside that base, so the split between item price and postage does not matter. A $20.00 item with free shipping and a $12.00 item with $8.00 shipping both total 20.00, both pay 20.00 x 0.136 = 2.72 plus 0.40 = 3.12, and both net 16.88 before cost. Postage is not fee-free income: $5.00 of shipping revenue adds 5.00 x 0.136 = 0.68 to the fee.
Boundary cases where the number moves
The $10.00 threshold is a step, not a curve. At exactly 10.00 the fee is 1.36 + 0.30 = 1.66, an effective 16.60%, and net prints 8.34. At 10.01 the fee is 1.3614 + 0.40 = 1.76, an effective 17.60%, and net prints 8.25. The order grew by one cent while proceeds fell by nine.
The fixed part punishes small sales. A $4.00 order pays 0.544 + 0.30 = 0.84, which is 21.10% of the sale. A $100.00 order pays 13.60 + 0.40 = 14.00, exactly 14.00%. A $1,000.00 order pays 136.40, or 13.64%, creeping toward the 13.60% floor. At the bottom edge a $0.01 order still owes the full 0.30 and returns net -0.29.
Guards are narrow: item at or below 0, or negative shipping, returns the Check the inputs block instead of a number. Item cost is never checked, so -5.00 on a $50.00 sale returns 47.80 rather than 42.80, overstating proceeds by 5.00. Category rates, promoted-listing ad rates and international fees sit outside this formula, so read the figure as an upper bound before pricing a listing.